In my classes I implement IDisposable as follows:
public class User : IDisposable
{
public int id { get; protected set; }
public string name { get; protected set; }
public string pass { get; protected set; }
public User(int UserID)
{
id = UserID;
}
public User(string Username, string Password)
{
name = Username;
pass = Password;
}
// Other functions go here...
public void Dispose()
{
// Clear all property values that maybe have been set
// when the class was instantiated
id = 0;
name = String.Empty;
pass = String.Empty;
}
}
In VS2012, my Code Analysis says to implement IDisposable correctly, but I'm not sure what I've done wrong here.
The exact text is as follows:
CA1063 Implement IDisposable correctly Provide an overridable implementation of Dispose(bool) on 'User' or mark the type as sealed. A call to Dispose(false) should only clean up native resources. A call to Dispose(true) should clean up both managed and native resources. stman User.cs 10
For reference: CA1063: Implement IDisposable correctly
I've read through this page, but I'm afraid I don't really understand what needs to be done here.
If anyone can explain in more layman's terms what the problem is and/or how IDisposable should be implemented, that will really help!
This would be the correct implementation, although I don't see anything you need to dispose in the code you posted. You only need to implement IDisposable when:
You have unmanaged resources
You're holding on to references of things that are themselves disposable.
Nothing in the code you posted needs to be disposed.
public class User : IDisposable
{
public int id { get; protected set; }
public string name { get; protected set; }
public string pass { get; protected set; }
public User(int userID)
{
id = userID;
}
public User(string Username, string Password)
{
name = Username;
pass = Password;
}
// Other functions go here...
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
protected virtual void Dispose(bool disposing)
{
if (disposing)
{
// free managed resources
}
// free native resources if there are any.
}
}
First of all, you don't need to "clean up" strings and ints - they will be taken care of automatically by the garbage collector. The only thing that needs to be cleaned up in Dispose are unmanaged resources or managed recources that implement IDisposable.
However, assuming this is just a learning exercise, the recommended way to implement IDisposable is to add a "safety catch" to ensure that any resources aren't disposed of twice:
public void Dispose()
{
Dispose(true);
// Use SupressFinalize in case a subclass
// of this type implements a finalizer.
GC.SuppressFinalize(this);
}
protected virtual void Dispose(bool disposing)
{
if (!_disposed)
{
if (disposing)
{
// Clear all property values that maybe have been set
// when the class was instantiated
id = 0;
name = String.Empty;
pass = String.Empty;
}
// Indicate that the instance has been disposed.
_disposed = true;
}
}
The following example shows the general best practice to implement IDisposable interface. Reference
Keep in mind that you need a destructor(finalizer) only if you have unmanaged resources in your class. And if you add a destructor you should suppress Finalization in the Dispose, otherwise it will cause your objects resides in memory longer that it should (Note: Read how Finalization works). Below example elaborate all above.
public class DisposeExample
{
// A base class that implements IDisposable.
// By implementing IDisposable, you are announcing that
// instances of this type allocate scarce resources.
public class MyResource: IDisposable
{
// Pointer to an external unmanaged resource.
private IntPtr handle;
// Other managed resource this class uses.
private Component component = new Component();
// Track whether Dispose has been called.
private bool disposed = false;
// The class constructor.
public MyResource(IntPtr handle)
{
this.handle = handle;
}
// Implement IDisposable.
// Do not make this method virtual.
// A derived class should not be able to override this method.
public void Dispose()
{
Dispose(true);
// This object will be cleaned up by the Dispose method.
// Therefore, you should call GC.SupressFinalize to
// take this object off the finalization queue
// and prevent finalization code for this object
// from executing a second time.
GC.SuppressFinalize(this);
}
// Dispose(bool disposing) executes in two distinct scenarios.
// If disposing equals true, the method has been called directly
// or indirectly by a user's code. Managed and unmanaged resources
// can be disposed.
// If disposing equals false, the method has been called by the
// runtime from inside the finalizer and you should not reference
// other objects. Only unmanaged resources can be disposed.
protected virtual void Dispose(bool disposing)
{
// Check to see if Dispose has already been called.
if(!this.disposed)
{
// If disposing equals true, dispose all managed
// and unmanaged resources.
if(disposing)
{
// Dispose managed resources.
component.Dispose();
}
// Call the appropriate methods to clean up
// unmanaged resources here.
// If disposing is false,
// only the following code is executed.
CloseHandle(handle);
handle = IntPtr.Zero;
// Note disposing has been done.
disposed = true;
}
}
// Use interop to call the method necessary
// to clean up the unmanaged resource.
[System.Runtime.InteropServices.DllImport("Kernel32")]
private extern static Boolean CloseHandle(IntPtr handle);
// Use C# destructor syntax for finalization code.
// This destructor will run only if the Dispose method
// does not get called.
// It gives your base class the opportunity to finalize.
// Do not provide destructors in types derived from this class.
~MyResource()
{
// Do not re-create Dispose clean-up code here.
// Calling Dispose(false) is optimal in terms of
// readability and maintainability.
Dispose(false);
}
}
public static void Main()
{
// Insert code here to create
// and use the MyResource object.
}
}
IDisposable exists to provide a means for you to clean up unmanaged resources that won't be cleaned up automatically by the Garbage Collector.
All of the resources that you are "cleaning up" are managed resources, and as such your Dispose method is accomplishing nothing. Your class shouldn't implement IDisposable at all. The Garbage Collector will take care of all of those fields just fine on its own.
You need to use the Disposable Pattern like this:
private bool _disposed = false;
protected virtual void Dispose(bool disposing)
{
if (!_disposed)
{
if (disposing)
{
// Dispose any managed objects
// ...
}
// Now disposed of any unmanaged objects
// ...
_disposed = true;
}
}
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
// Destructor
~YourClassName()
{
Dispose(false);
}
You have no need to do your User class being IDisposable since the class doesn't acquire any non-managed resources (file, database connection, etc.). Usually, we mark classes as
IDisposable if they have at least one IDisposable field or/and property.
When implementing IDisposable, better put it according Microsoft typical scheme:
public class User: IDisposable {
...
protected virtual void Dispose(Boolean disposing) {
if (disposing) {
// There's no need to set zero empty values to fields
// id = 0;
// name = String.Empty;
// pass = String.Empty;
//TODO: free your true resources here (usually IDisposable fields)
}
}
public void Dispose() {
Dispose(true);
GC.SuppressFinalize(this);
}
}
Idisposable is implement whenever you want a deterministic (confirmed) garbage collection.
class Users : IDisposable
{
~Users()
{
Dispose(false);
}
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
// This method will remove current object from garbage collector's queue
// and stop calling finilize method twice
}
public void Dispose(bool disposer)
{
if (disposer)
{
// dispose the managed objects
}
// dispose the unmanaged objects
}
}
When creating and using the Users class use "using" block to avoid explicitly calling dispose method:
using (Users _user = new Users())
{
// do user related work
}
end of the using block created Users object will be disposed by implicit invoke of dispose method.
I see a lot of examples of the Microsoft Dispose pattern which is really an anti-pattern. As many have pointed out the code in the question does not require IDisposable at all. But if you where going to implement it please don't use the Microsoft pattern. Better answer would be following the suggestions in this article:
https://www.codeproject.com/Articles/29534/IDisposable-What-Your-Mother-Never-Told-You-About
The only other thing that would likely be helpful is suppressing that code analysis warning... https://learn.microsoft.com/en-us/visualstudio/code-quality/in-source-suppression-overview?view=vs-2017
Related
C# 2008
I have been working on this for a while now, and I am still confused about the use of finalize and dispose methods in code. My questions are below:
I know that we only need a finalizer while disposing unmanaged resources. However, if there are managed resources that make calls to unmanaged resources, would it still need to implement a finalizer?
However, if I develop a class that doesn't use any unmanaged resource - directly or indirectly, should I implement the IDisposable to allow the clients of that class to use the 'using statement'?
Would it be feasible to implement IDisposable just to enable clients of your class to use the using statement?
using(myClass objClass = new myClass())
{
// Do stuff here
}
I have developed this simple code below to demonstrate the Finalize/dispose use:
public class NoGateway : IDisposable
{
private WebClient wc = null;
public NoGateway()
{
wc = new WebClient();
wc.DownloadStringCompleted += wc_DownloadStringCompleted;
}
// Start the Async call to find if NoGateway is true or false
public void NoGatewayStatus()
{
// Start the Async's download
// Do other work here
wc.DownloadStringAsync(new Uri(www.xxxx.xxx));
}
private void wc_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
{
// Do work here
}
// Dispose of the NoGateway object
public void Dispose()
{
wc.DownloadStringCompleted -= wc_DownloadStringCompleted;
wc.Dispose();
GC.SuppressFinalize(this);
}
}
Question about the source code:
Here I have not added the finalizer, and normally the finalizer will be called by the GC, and the finalizer will call the Dispose. As I don't have the finalizer, when do I call the Dispose method? Is it the client of the class that has to call it?
So my class in the example is called NoGateway and the client could use and dispose of the class like this:
using(NoGateway objNoGateway = new NoGateway())
{
// Do stuff here
}
Would the Dispose method be automatically called when execution reaches the end of the using block, or does the client have to manually call the dispose method? i.e.
NoGateway objNoGateway = new NoGateway();
// Do stuff with object
objNoGateway.Dispose(); // finished with it
I am using the WebClient class in my NoGateway class. Because WebClient implements the IDisposable interface, does this mean that WebClient indirectly uses unmanaged resources? Is there a hard and fast rule to follow this? How do I know that a class uses unmanaged resources?
The recommended IDisposable pattern is here. When programming a class that uses IDisposable, generally you should use two patterns:
When implementing a sealed class that doesn't use unmanaged resources, you simply implement a Dispose method as with normal interface implementations:
public sealed class A : IDisposable
{
public void Dispose()
{
// get rid of managed resources, call Dispose on member variables...
}
}
When implementing an unsealed class, do it like this:
public class B : IDisposable
{
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
protected virtual void Dispose(bool disposing)
{
if (disposing)
{
// get rid of managed resources
}
// get rid of unmanaged resources
}
// only if you use unmanaged resources directly in B
//~B()
//{
// Dispose(false);
//}
}
Notice that I haven't declared a finalizer in B; you should only implement a finalizer if you have actual unmanaged resources to dispose. The CLR deals with finalizable objects differently to non-finalizable objects, even if SuppressFinalize is called.
So, you shouldn't declare a finalizer unless you have to, but you give inheritors of your class a hook to call your Dispose and implement a finalizer themselves if they use unmanaged resources directly:
public class C : B
{
private IntPtr m_Handle;
protected override void Dispose(bool disposing)
{
if (disposing)
{
// get rid of managed resources
}
ReleaseHandle(m_Handle);
base.Dispose(disposing);
}
~C() {
Dispose(false);
}
}
If you're not using unmanaged resources directly (SafeHandle and friends doesn't count, as they declare their own finalizers), then don't implement a finalizer, as the GC deals with finalizable classes differently, even if you later suppress the finalizer. Also note that, even though B doesn't have a finalizer, it still calls SuppressFinalize to correctly deal with any subclasses that do implement a finalizer.
When a class implements the IDisposable interface, it means that somewhere there are some unmanaged resources that should be got rid of when you've finished using the class. The actual resources are encapsulated within the classes; you don't need to explicitly delete them. Simply calling Dispose() or wrapping the class in a using(...) {} will make sure any unmanaged resources are got rid of as necessary.
The official pattern to implement IDisposable is hard to understand. I believe this one is better:
public class BetterDisposableClass : IDisposable {
public void Dispose() {
CleanUpManagedResources();
CleanUpNativeResources();
GC.SuppressFinalize(this);
}
protected virtual void CleanUpManagedResources() {
// ...
}
protected virtual void CleanUpNativeResources() {
// ...
}
~BetterDisposableClass() {
CleanUpNativeResources();
}
}
An even better solution is to have a rule that you always have to create a wrapper class for any unmanaged resource that you need to handle:
public class NativeDisposable : IDisposable {
public void Dispose() {
CleanUpNativeResource();
GC.SuppressFinalize(this);
}
protected virtual void CleanUpNativeResource() {
// ...
}
~NativeDisposable() {
CleanUpNativeResource();
}
}
With SafeHandle and its derivatives, these classes should be very rare.
The result for disposable classes that don't deal directly with unmanaged resources, even in the presence of inheritance, is powerful: they don't need to be concerned with unmanaged resources anymore. They'll be simple to implement and to understand:
public class ManagedDisposable : IDisposable {
public virtual void Dispose() {
// dispose of managed resources
}
}
Note that any IDisposable implementation should follow the below pattern (IMHO). I developed this pattern based on info from several excellent .NET "gods" the .NET Framework Design Guidelines (note that MSDN does not follow this for some reason!). The .NET Framework Design Guidelines were written by Krzysztof Cwalina (CLR Architect at the time) and Brad Abrams (I believe the CLR Program Manager at the time) and Bill Wagner ([Effective C#] and [More Effective C#] (just take a look for these on Amazon.com:
Note that you should NEVER implement a Finalizer unless your class directly contains (not inherits) UNmanaged resources. Once you implement a Finalizer in a class, even if it is never called, it is guaranteed to live for an extra collection. It is automatically placed on the Finalization Queue (which runs on a single thread). Also, one very important note...all code executed within a Finalizer (should you need to implement one) MUST be thread-safe AND exception-safe! BAD things will happen otherwise...(i.e. undetermined behavior and in the case of an exception, a fatal unrecoverable application crash).
The pattern I've put together (and written a code snippet for) follows:
#region IDisposable implementation
//TODO remember to make this class inherit from IDisposable -> $className$ : IDisposable
// Default initialization for a bool is 'false'
private bool IsDisposed { get; set; }
/// <summary>
/// Implementation of Dispose according to .NET Framework Design Guidelines.
/// </summary>
/// <remarks>Do not make this method virtual.
/// A derived class should not be able to override this method.
/// </remarks>
public void Dispose()
{
Dispose( true );
// This object will be cleaned up by the Dispose method.
// Therefore, you should call GC.SupressFinalize to
// take this object off the finalization queue
// and prevent finalization code for this object
// from executing a second time.
// Always use SuppressFinalize() in case a subclass
// of this type implements a finalizer.
GC.SuppressFinalize( this );
}
/// <summary>
/// Overloaded Implementation of Dispose.
/// </summary>
/// <param name="isDisposing"></param>
/// <remarks>
/// <para><list type="bulleted">Dispose(bool isDisposing) executes in two distinct scenarios.
/// <item>If <paramref name="isDisposing"/> equals true, the method has been called directly
/// or indirectly by a user's code. Managed and unmanaged resources
/// can be disposed.</item>
/// <item>If <paramref name="isDisposing"/> equals false, the method has been called by the
/// runtime from inside the finalizer and you should not reference
/// other objects. Only unmanaged resources can be disposed.</item></list></para>
/// </remarks>
protected virtual void Dispose( bool isDisposing )
{
// TODO If you need thread safety, use a lock around these
// operations, as well as in your methods that use the resource.
try
{
if( !this.IsDisposed )
{
if( isDisposing )
{
// TODO Release all managed resources here
$end$
}
// TODO Release all unmanaged resources here
// TODO explicitly set root references to null to expressly tell the GarbageCollector
// that the resources have been disposed of and its ok to release the memory allocated for them.
}
}
finally
{
// explicitly call the base class Dispose implementation
base.Dispose( isDisposing );
this.IsDisposed = true;
}
}
//TODO Uncomment this code if this class will contain members which are UNmanaged
//
///// <summary>Finalizer for $className$</summary>
///// <remarks>This finalizer will run only if the Dispose method does not get called.
///// It gives your base class the opportunity to finalize.
///// DO NOT provide finalizers in types derived from this class.
///// All code executed within a Finalizer MUST be thread-safe!</remarks>
// ~$className$()
// {
// Dispose( false );
// }
#endregion IDisposable implementation
Here is the code for implementing IDisposable in a derived class. Note that you do not need to explicitly list inheritance from IDisposable in the definition of the derived class.
public DerivedClass : BaseClass, IDisposable (remove the IDisposable because it is inherited from BaseClass)
protected override void Dispose( bool isDisposing )
{
try
{
if ( !this.IsDisposed )
{
if ( isDisposing )
{
// Release all managed resources here
}
}
}
finally
{
// explicitly call the base class Dispose implementation
base.Dispose( isDisposing );
}
}
I've posted this implementation on my blog at: How to Properly Implement the Dispose Pattern
I agree with pm100 (and should have explicitly said this in my earlier post).
You should never implement IDisposable in a class unless you need it. To be very specific, there are about 5 times when you would ever need/should implement IDisposable:
Your class explicitly contains (i.e. not via inheritance) any managed resources which implement IDisposable and should be cleaned up once your class is no longer used. For example, if your class contains an instance of a Stream, DbCommand, DataTable, etc.
Your class explicitly contains any managed resources which implement a Close() method - e.g. IDataReader, IDbConnection, etc. Note that some of these classes do implement IDisposable by having Dispose() as well as a Close() method.
Your class explicitly contains an unmanaged resource - e.g. a COM object, pointers (yes, you can use pointers in managed C# but they must be declared in 'unsafe' blocks, etc.
In the case of unmanaged resources, you should also make sure to call System.Runtime.InteropServices.Marshal.ReleaseComObject() on the RCW. Even though the RCW is, in theory, a managed wrapper, there is still reference counting going on under the covers.
If your class subscribes to events using strong references. You need to unregister/detach yourself from the events. Always to make sure these are not null first before trying to unregister/detach them!.
Your class contains any combination of the above...
A recommended alternative to working with COM objects and having to use Marshal.ReleaseComObject() is to use the System.Runtime.InteropServices.SafeHandle class.
The BCL (Base Class Library Team) has a good blog post about it here http://blogs.msdn.com/bclteam/archive/2005/03/16/396900.aspx
One very important note to make is that if you are working with WCF and cleaning up resources, you should ALMOST ALWAYS avoid the 'using' block. There are plenty of blog posts out there and some on MSDN about why this is a bad idea. I have also posted about it here - Don't use 'using()' with a WCF proxy
Using lambdas instead of IDisposable.
I have never been thrilled with the whole using/IDisposable idea. The problem is that it requires the caller to:
know that they must use IDisposable
remember to use 'using'.
My new preferred method is to use a factory method and a lambda instead
Imagine I want to do something with a SqlConnection (something that should be wrapped in a using). Classically you would do
using (Var conn = Factory.MakeConnection())
{
conn.Query(....);
}
New way
Factory.DoWithConnection((conn)=>
{
conn.Query(...);
}
In the first case the caller could simply not use the using syntax. IN the second case the user has no choice. There is no method that creates a SqlConnection object, the caller must invoke DoWithConnection.
DoWithConnection looks like this
void DoWithConnection(Action<SqlConnection> action)
{
using (var conn = MakeConnection())
{
action(conn);
}
}
MakeConnection is now private
nobody answered the question about whether you should implement IDisposable even though you dont need it.
Short answer : No
Long answer:
This would allow a consumer of your class to use 'using'. The question I would ask is - why would they do it? Most devs will not use 'using' unless they know that they must - and how do they know. Either
its obviuos the them from experience (a socket class for example)
its documented
they are cautious and can see that the class implements IDisposable
So by implementing IDisposable you are telling devs (at least some) that this class wraps up something that must be released. They will use 'using' - but there are other cases where using is not possible (the scope of object is not local); and they will have to start worrying about the lifetime of the objects in those other cases - I would worry for sure. But this is not necessary
You implement Idisposable to enable them to use using, but they wont use using unless you tell them to.
So dont do it
Dispose pattern:
public abstract class DisposableObject : IDisposable
{
public bool Disposed { get; private set;}
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
~DisposableObject()
{
Dispose(false);
}
private void Dispose(bool disposing)
{
if (!Disposed)
{
if (disposing)
{
DisposeManagedResources();
}
DisposeUnmanagedResources();
Disposed = true;
}
}
protected virtual void DisposeManagedResources() { }
protected virtual void DisposeUnmanagedResources() { }
}
Example of inheritance:
public class A : DisposableObject
{
public Component components_a { get; set; }
private IntPtr handle_a;
protected override void DisposeManagedResources()
{
try
{
Console.WriteLine("A_DisposeManagedResources");
components_a.Dispose();
components_a = null;
}
finally
{
base.DisposeManagedResources();
}
}
protected override void DisposeUnmanagedResources()
{
try
{
Console.WriteLine("A_DisposeUnmanagedResources");
CloseHandle(handle_a);
handle_a = IntPtr.Zero;
}
finally
{
base.DisposeUnmanagedResources();
}
}
}
public class B : A
{
public Component components_b { get; set; }
private IntPtr handle_b;
protected override void DisposeManagedResources()
{
try
{
Console.WriteLine("B_DisposeManagedResources");
components_b.Dispose();
components_b = null;
}
finally
{
base.DisposeManagedResources();
}
}
protected override void DisposeUnmanagedResources()
{
try
{
Console.WriteLine("B_DisposeUnmanagedResources");
CloseHandle(handle_b);
handle_b = IntPtr.Zero;
}
finally
{
base.DisposeUnmanagedResources();
}
}
}
If you are using other managed objects that are using unmanaged resources, it is not your responsibility to ensure those are finalized. Your responsibility is to call Dispose on those objects when Dispose is called on your object, and it stops there.
If your class doesn't use any scarce resources, I fail to see why you would make your class implement IDisposable. You should only do so if you're:
Know you will have scarce resources in your objects soon, just not now (and I mean that as in "we're still developing, it will be here before we're done", not as in "I think we'll need this")
Using scarce resources
Yes, the code that uses your code must call the Dispose method of your object. And yes, the code that uses your object can use using as you've shown.
(2 again?) It is likely that the WebClient uses either unmanaged resources, or other managed resources that implement IDisposable. The exact reason, however, is not important. What is important is that it implements IDisposable, and so it falls on you to act upon that knowledge by disposing of the object when you're done with it, even if it turns out WebClient uses no other resources at all.
Some aspects of another answer are slightly incorrect for 2 reasons:
First,
using(NoGateway objNoGateway = new NoGateway())
actually is equivalent to:
try
{
NoGateway = new NoGateway();
}
finally
{
if(NoGateway != null)
{
NoGateway.Dispose();
}
}
This may sound ridiculous since the 'new' operator should never return 'null' unless you have an OutOfMemory exception. But consider the following cases:
1. You call a FactoryClass that returns an IDisposable resource or
2. If you have a type that may or may not inherit from IDisposable depending on its implementation - remember that I've seen the IDisposable pattern implemented incorrectly many times at many clients where developers just add a Dispose() method without inheriting from IDisposable (bad, bad, bad). You could also have the case of an IDisposable resource being returned from a property or method (again bad, bad, bad - don't 'give away your IDisposable resources)
using(IDisposable objNoGateway = new NoGateway() as IDisposable)
{
if (NoGateway != null)
{
...
If the 'as' operator returns null (or property or method returning the resource), and your code in the 'using' block protects against 'null', your code will not blow up when trying to call Dispose on a null object because of the 'built-in' null check.
The second reason your reply is not accurate is because of the following stmt:
A finalizer is called upon the GC destroying your object
First, Finalization (as well as GC itself) is non-deterministic. THe CLR determines when it will call a finalizer. i.e. the developer/code has no idea. If the IDisposable pattern is implemented correctly (as I've posted above) and GC.SuppressFinalize() has been called, the the Finalizer will NOT be called. This is one of the big reasons to properly implement the pattern correctly. Since there is only 1 Finalizer thread per managed process, regardless of the number of logical processors, you can easily degrade performance by backing up or even hanging the Finalizer thread by forgetting to call GC.SuppressFinalize().
I've posted a correct implementation of the Dispose Pattern on my blog: How to Properly Implement the Dispose Pattern
1) WebClient is a managed type, so you don't need a finalizer. The finalizer is needed in the case your users don't Dispose() of your NoGateway class and the native type (which is not collected by the GC) needs to be cleaned up after. In this case, if the user doesn't call Dispose(), the contained WebClient will be disposed by the GC right after the NoGateway does.
2) Indirectly yes, but you shouldn't have to worry about it. Your code is correct as stands and you cannot prevent your users from forgetting to Dispose() very easily.
Pattern from msdn
public class BaseResource: IDisposable
{
private IntPtr handle;
private Component Components;
private bool disposed = false;
public BaseResource()
{
}
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
protected virtual void Dispose(bool disposing)
{
if(!this.disposed)
{
if(disposing)
{
Components.Dispose();
}
CloseHandle(handle);
handle = IntPtr.Zero;
}
disposed = true;
}
~BaseResource()
{ Dispose(false);
}
public void DoSomething()
{
if(this.disposed)
{
throw new ObjectDisposedException();
}
}
}
public class MyResourceWrapper: BaseResource
{
private ManagedResource addedManaged;
private NativeResource addedNative;
private bool disposed = false;
public MyResourceWrapper()
{
}
protected override void Dispose(bool disposing)
{
if(!this.disposed)
{
try
{
if(disposing)
{
addedManaged.Dispose();
}
CloseHandle(addedNative);
this.disposed = true;
}
finally
{
base.Dispose(disposing);
}
}
}
}
using(NoGateway objNoGateway = new NoGateway())
is equivalent to
try
{
NoGateway = new NoGateway();
}
finally
{
NoGateway.Dispose();
}
A finalizer is called upon the GC destroying your object. This can be at a totally different time than when you leave your method. The Dispose of IDisposable is called immediately after you leave the using block. Hence the pattern is usually to use using to free ressources immediately after you don't need them anymore.
From what I know, it's highly recommended NOT to use the Finalizer / Destructor:
public ~MyClass() {
//dont use this
}
Mostly, this is due to not knowing when or IF it will be called. The dispose method is much better, especially if you us using or dispose directly.
using is good. use it :)
The Dispose pattern is notoriously complicated to get right, especially when we have a hierarchy of classes that needs to dispose things at different levels. The recommended implementation is as follow, took from Implement a Dispose method - Microsoft Docs.
using System;
class BaseClass : IDisposable
{
// To detect redundant calls
private bool _disposed = false;
~BaseClass() => Dispose(false);
// Public implementation of Dispose pattern callable by consumers.
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
// Protected implementation of Dispose pattern.
protected virtual void Dispose(bool disposing)
{
if (_disposed)
{
return;
}
if (disposing)
{
// TODO: dispose managed state (managed objects).
}
// TODO: free unmanaged resources (unmanaged objects) and override a finalizer below.
// TODO: set large fields to null.
_disposed = true;
}
}
using Microsoft.Win32.SafeHandles;
using System;
using System.Runtime.InteropServices;
class DerivedClass : BaseClass
{
// To detect redundant calls
private bool _disposed = false;
// Instantiate a SafeHandle instance.
private SafeHandle _safeHandle = new SafeFileHandle(IntPtr.Zero, true);
// Protected implementation of Dispose pattern.
protected override void Dispose(bool disposing)
{
if (_disposed)
{
return;
}
if (disposing)
{
// Dispose managed state (managed objects).
_safeHandle?.Dispose();
}
_disposed = true;
// Call base class implementation.
base.Dispose(disposing);
}
}
What I don't get in this implementation is what advantage we have in adding a _disposed field at each level of the hierarchy? Instead, we could take care of the _disposed only in the top level of the hierarchy (the one implementing directly IDisposable and not care about it in the derived classes.
Something like this:
using System;
class BaseClass : IDisposable
{
// To detect redundant calls
private bool _disposed = false;
~BaseClass()
{
if (_disposed)
{
return;
}
Dispose(false);
_disposed = true;
}
// Public implementation of Dispose pattern callable by consumers.
public void Dispose()
{
if (_disposed)
{
return;
}
Dispose(true);
GC.SuppressFinalize(this);
_disposed = true;
}
// Protected implementation of Dispose pattern.
protected virtual void Dispose(bool disposing)
{
if (disposing)
{
// TODO: dispose managed state (managed objects).
}
// TODO: free unmanaged resources (unmanaged objects) and override a finalizer below.
// TODO: set large fields to null.
}
}
using Microsoft.Win32.SafeHandles;
using System;
using System.Runtime.InteropServices;
class DerivedClass : BaseClass
{
// Instantiate a SafeHandle instance.
private SafeHandle _safeHandle = new SafeFileHandle(IntPtr.Zero, true);
// Protected implementation of Dispose pattern.
protected override void Dispose(bool disposing)
{
if (disposing)
{
// Dispose managed state (managed objects).
_safeHandle?.Dispose();
}
// Call base class implementation.
base.Dispose(disposing);
}
}
This is such a widely used code sample that there must certainly be a good reason for it to be implemented with the repeated _disposed at each level, but I just can't find any.
It's a tiny bit more code in the base class, but less to worry about in the derived class, and some repeated information removed.
What else am I missing?
Edit:
As #InBetween correctly says that one drawback of my implementation is that if you'd need to check if your object is disposed in one method of the derived class you won't be able to check it. Let's correct that issue by making it a protected property with a private set.
using System;
class BaseClass : IDisposable
{
// To detect redundant calls
protected bool Disposed { get; private set; } = false;
~BaseClass()
{
if (Disposed)
{
return;
}
Dispose(false);
Disposed = true;
}
// Public implementation of Dispose pattern callable by consumers.
public void Dispose()
{
if (Disposed)
{
return;
}
Dispose(true);
GC.SuppressFinalize(this);
Disposed = true;
}
// Protected implementation of Dispose pattern.
protected virtual void Dispose(bool disposing)
{
if (disposing)
{
// TODO: dispose managed state (managed objects).
}
// TODO: free unmanaged resources (unmanaged objects) and override a finalizer below.
// TODO: set large fields to null.
}
}
using Microsoft.Win32.SafeHandles;
using System;
using System.Runtime.InteropServices;
class DerivedClass : BaseClass
{
// Instantiate a SafeHandle instance.
private SafeHandle _safeHandle = new SafeFileHandle(IntPtr.Zero, true);
public void DoSomething()
{
if(Disposed)
{
throw new ObjectDisposedException("Cannot access disposed resource");
}
}
// Protected implementation of Dispose pattern.
protected override void Dispose(bool disposing)
{
if (disposing)
{
// Dispose managed state (managed objects).
_safeHandle?.Dispose();
}
// Call base class implementation.
base.Dispose(disposing);
}
}
If you are inheriting from a disposable class, one of two conditions must be true.
Your subcless does not introduce a new disposable resource. In this case you don't need to override Dispose and the question is moot.
Your subclass introduces a new disposable resource. In this case, you're going to override Dispose, insert your own disposal code, then call base.Dispose. The _disposed flag is there to help you remember to prevent your disposal code from executing twice.
You certainly can remove _disposed if you want. But you probably do not care much about the base class' _disposed flag, if it even has one. It worries about what it is disposing, and you worry about yours.
The reason is simple. In your implementation you cant use _disposed in the derived type to check if any method is invoked when the object is already disposed and take the necessary actions. In your implementation you'd need to create your own redundant flag isDisposed which defeats the purpose; you already have one "for free" from the pattern itself following the guidelines.
A case could be made though about making _disposed protected.
This question already has answers here:
Proper use of the IDisposable interface
(20 answers)
Closed 3 years ago.
I am trying to work out exactly what I need to do to dispose of a property in C# when using IDisposable. I can see the template, but I am not sure about actually disposing of objects.
I am working with the example given on this site:
https://learn.microsoft.com/en-us/dotnet/standard/garbage-collection/implementing-dispose
I have added 3 properties:
privInt: Private value type. Would I dispose of this as it could be saved on the heap so may require GC? If I would then how, cannot set to null or call dispose? If not then I assume it has to be left to GC - but is it not the point of Dispose to free resources?
NonIDisClassInstance - Do I set to null? Is that enough
Can anyone comment on my implementation below and advise on what is correct/wrong.
IDisClass - Just call dispose
class BaseClass : IDisposable
{
// Flag: Has Dispose already been called?
bool disposed = false;
// Public implementation of Dispose pattern callable by consumers.
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
//Private value type
private int privInt;
//Private class that does not implement IDisposable
Private NonIDisClass NonIDisClassInstance;
//Private class that does implement IDisposable
Private IDisClass IDisClassInstance;
// Protected implementation of Dispose pattern.
protected virtual void Dispose(bool disposing)
{
if (disposed)
return;
if (disposing) {
// Free any other managed objects here.
//
}
// Free any unmanaged objects here.
DisposeOfThis = ????;
NonIDisClassInstance = null;
IDisClassInstance.Dispose();
disposed = true;
}
~BaseClass()
{
Dispose(false);
}
}
You only need GC.SuppressFinalize(this); and a destructor if you are working with unmanaged memory. If not you can safely omit this.
In your Dispose implementation call this.IDisClassInstance?.Dispose();, that is all you need.
Your code can be condensed down to this.
class BaseClass : System.IDisposable
{
public virtual void Dispose()
{
// never throw an exception from Dispose so prevent an NRE by using ?.
this.IDisClassInstance?.Dispose();
}
//Private class that does not implement IDisposable
private object NonIDisClassInstance;
//Private class that does implement IDisposable
private IDisposable IDisClassInstance;
}
Do keep in mind that using Dispose is not necessarily about freeing up memory, it is about cleaning up / freeing up unmanaged resources which might also include memory. Things like open file streams or database connections or network connections.
Note that your derived types can override Dispose but those overriden methods should include a call to base.Dispose(); so the managed resources of the base class are released.
C# 2008
I have been working on this for a while now, and I am still confused about the use of finalize and dispose methods in code. My questions are below:
I know that we only need a finalizer while disposing unmanaged resources. However, if there are managed resources that make calls to unmanaged resources, would it still need to implement a finalizer?
However, if I develop a class that doesn't use any unmanaged resource - directly or indirectly, should I implement the IDisposable to allow the clients of that class to use the 'using statement'?
Would it be feasible to implement IDisposable just to enable clients of your class to use the using statement?
using(myClass objClass = new myClass())
{
// Do stuff here
}
I have developed this simple code below to demonstrate the Finalize/dispose use:
public class NoGateway : IDisposable
{
private WebClient wc = null;
public NoGateway()
{
wc = new WebClient();
wc.DownloadStringCompleted += wc_DownloadStringCompleted;
}
// Start the Async call to find if NoGateway is true or false
public void NoGatewayStatus()
{
// Start the Async's download
// Do other work here
wc.DownloadStringAsync(new Uri(www.xxxx.xxx));
}
private void wc_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
{
// Do work here
}
// Dispose of the NoGateway object
public void Dispose()
{
wc.DownloadStringCompleted -= wc_DownloadStringCompleted;
wc.Dispose();
GC.SuppressFinalize(this);
}
}
Question about the source code:
Here I have not added the finalizer, and normally the finalizer will be called by the GC, and the finalizer will call the Dispose. As I don't have the finalizer, when do I call the Dispose method? Is it the client of the class that has to call it?
So my class in the example is called NoGateway and the client could use and dispose of the class like this:
using(NoGateway objNoGateway = new NoGateway())
{
// Do stuff here
}
Would the Dispose method be automatically called when execution reaches the end of the using block, or does the client have to manually call the dispose method? i.e.
NoGateway objNoGateway = new NoGateway();
// Do stuff with object
objNoGateway.Dispose(); // finished with it
I am using the WebClient class in my NoGateway class. Because WebClient implements the IDisposable interface, does this mean that WebClient indirectly uses unmanaged resources? Is there a hard and fast rule to follow this? How do I know that a class uses unmanaged resources?
The recommended IDisposable pattern is here. When programming a class that uses IDisposable, generally you should use two patterns:
When implementing a sealed class that doesn't use unmanaged resources, you simply implement a Dispose method as with normal interface implementations:
public sealed class A : IDisposable
{
public void Dispose()
{
// get rid of managed resources, call Dispose on member variables...
}
}
When implementing an unsealed class, do it like this:
public class B : IDisposable
{
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
protected virtual void Dispose(bool disposing)
{
if (disposing)
{
// get rid of managed resources
}
// get rid of unmanaged resources
}
// only if you use unmanaged resources directly in B
//~B()
//{
// Dispose(false);
//}
}
Notice that I haven't declared a finalizer in B; you should only implement a finalizer if you have actual unmanaged resources to dispose. The CLR deals with finalizable objects differently to non-finalizable objects, even if SuppressFinalize is called.
So, you shouldn't declare a finalizer unless you have to, but you give inheritors of your class a hook to call your Dispose and implement a finalizer themselves if they use unmanaged resources directly:
public class C : B
{
private IntPtr m_Handle;
protected override void Dispose(bool disposing)
{
if (disposing)
{
// get rid of managed resources
}
ReleaseHandle(m_Handle);
base.Dispose(disposing);
}
~C() {
Dispose(false);
}
}
If you're not using unmanaged resources directly (SafeHandle and friends doesn't count, as they declare their own finalizers), then don't implement a finalizer, as the GC deals with finalizable classes differently, even if you later suppress the finalizer. Also note that, even though B doesn't have a finalizer, it still calls SuppressFinalize to correctly deal with any subclasses that do implement a finalizer.
When a class implements the IDisposable interface, it means that somewhere there are some unmanaged resources that should be got rid of when you've finished using the class. The actual resources are encapsulated within the classes; you don't need to explicitly delete them. Simply calling Dispose() or wrapping the class in a using(...) {} will make sure any unmanaged resources are got rid of as necessary.
The official pattern to implement IDisposable is hard to understand. I believe this one is better:
public class BetterDisposableClass : IDisposable {
public void Dispose() {
CleanUpManagedResources();
CleanUpNativeResources();
GC.SuppressFinalize(this);
}
protected virtual void CleanUpManagedResources() {
// ...
}
protected virtual void CleanUpNativeResources() {
// ...
}
~BetterDisposableClass() {
CleanUpNativeResources();
}
}
An even better solution is to have a rule that you always have to create a wrapper class for any unmanaged resource that you need to handle:
public class NativeDisposable : IDisposable {
public void Dispose() {
CleanUpNativeResource();
GC.SuppressFinalize(this);
}
protected virtual void CleanUpNativeResource() {
// ...
}
~NativeDisposable() {
CleanUpNativeResource();
}
}
With SafeHandle and its derivatives, these classes should be very rare.
The result for disposable classes that don't deal directly with unmanaged resources, even in the presence of inheritance, is powerful: they don't need to be concerned with unmanaged resources anymore. They'll be simple to implement and to understand:
public class ManagedDisposable : IDisposable {
public virtual void Dispose() {
// dispose of managed resources
}
}
Note that any IDisposable implementation should follow the below pattern (IMHO). I developed this pattern based on info from several excellent .NET "gods" the .NET Framework Design Guidelines (note that MSDN does not follow this for some reason!). The .NET Framework Design Guidelines were written by Krzysztof Cwalina (CLR Architect at the time) and Brad Abrams (I believe the CLR Program Manager at the time) and Bill Wagner ([Effective C#] and [More Effective C#] (just take a look for these on Amazon.com:
Note that you should NEVER implement a Finalizer unless your class directly contains (not inherits) UNmanaged resources. Once you implement a Finalizer in a class, even if it is never called, it is guaranteed to live for an extra collection. It is automatically placed on the Finalization Queue (which runs on a single thread). Also, one very important note...all code executed within a Finalizer (should you need to implement one) MUST be thread-safe AND exception-safe! BAD things will happen otherwise...(i.e. undetermined behavior and in the case of an exception, a fatal unrecoverable application crash).
The pattern I've put together (and written a code snippet for) follows:
#region IDisposable implementation
//TODO remember to make this class inherit from IDisposable -> $className$ : IDisposable
// Default initialization for a bool is 'false'
private bool IsDisposed { get; set; }
/// <summary>
/// Implementation of Dispose according to .NET Framework Design Guidelines.
/// </summary>
/// <remarks>Do not make this method virtual.
/// A derived class should not be able to override this method.
/// </remarks>
public void Dispose()
{
Dispose( true );
// This object will be cleaned up by the Dispose method.
// Therefore, you should call GC.SupressFinalize to
// take this object off the finalization queue
// and prevent finalization code for this object
// from executing a second time.
// Always use SuppressFinalize() in case a subclass
// of this type implements a finalizer.
GC.SuppressFinalize( this );
}
/// <summary>
/// Overloaded Implementation of Dispose.
/// </summary>
/// <param name="isDisposing"></param>
/// <remarks>
/// <para><list type="bulleted">Dispose(bool isDisposing) executes in two distinct scenarios.
/// <item>If <paramref name="isDisposing"/> equals true, the method has been called directly
/// or indirectly by a user's code. Managed and unmanaged resources
/// can be disposed.</item>
/// <item>If <paramref name="isDisposing"/> equals false, the method has been called by the
/// runtime from inside the finalizer and you should not reference
/// other objects. Only unmanaged resources can be disposed.</item></list></para>
/// </remarks>
protected virtual void Dispose( bool isDisposing )
{
// TODO If you need thread safety, use a lock around these
// operations, as well as in your methods that use the resource.
try
{
if( !this.IsDisposed )
{
if( isDisposing )
{
// TODO Release all managed resources here
$end$
}
// TODO Release all unmanaged resources here
// TODO explicitly set root references to null to expressly tell the GarbageCollector
// that the resources have been disposed of and its ok to release the memory allocated for them.
}
}
finally
{
// explicitly call the base class Dispose implementation
base.Dispose( isDisposing );
this.IsDisposed = true;
}
}
//TODO Uncomment this code if this class will contain members which are UNmanaged
//
///// <summary>Finalizer for $className$</summary>
///// <remarks>This finalizer will run only if the Dispose method does not get called.
///// It gives your base class the opportunity to finalize.
///// DO NOT provide finalizers in types derived from this class.
///// All code executed within a Finalizer MUST be thread-safe!</remarks>
// ~$className$()
// {
// Dispose( false );
// }
#endregion IDisposable implementation
Here is the code for implementing IDisposable in a derived class. Note that you do not need to explicitly list inheritance from IDisposable in the definition of the derived class.
public DerivedClass : BaseClass, IDisposable (remove the IDisposable because it is inherited from BaseClass)
protected override void Dispose( bool isDisposing )
{
try
{
if ( !this.IsDisposed )
{
if ( isDisposing )
{
// Release all managed resources here
}
}
}
finally
{
// explicitly call the base class Dispose implementation
base.Dispose( isDisposing );
}
}
I've posted this implementation on my blog at: How to Properly Implement the Dispose Pattern
I agree with pm100 (and should have explicitly said this in my earlier post).
You should never implement IDisposable in a class unless you need it. To be very specific, there are about 5 times when you would ever need/should implement IDisposable:
Your class explicitly contains (i.e. not via inheritance) any managed resources which implement IDisposable and should be cleaned up once your class is no longer used. For example, if your class contains an instance of a Stream, DbCommand, DataTable, etc.
Your class explicitly contains any managed resources which implement a Close() method - e.g. IDataReader, IDbConnection, etc. Note that some of these classes do implement IDisposable by having Dispose() as well as a Close() method.
Your class explicitly contains an unmanaged resource - e.g. a COM object, pointers (yes, you can use pointers in managed C# but they must be declared in 'unsafe' blocks, etc.
In the case of unmanaged resources, you should also make sure to call System.Runtime.InteropServices.Marshal.ReleaseComObject() on the RCW. Even though the RCW is, in theory, a managed wrapper, there is still reference counting going on under the covers.
If your class subscribes to events using strong references. You need to unregister/detach yourself from the events. Always to make sure these are not null first before trying to unregister/detach them!.
Your class contains any combination of the above...
A recommended alternative to working with COM objects and having to use Marshal.ReleaseComObject() is to use the System.Runtime.InteropServices.SafeHandle class.
The BCL (Base Class Library Team) has a good blog post about it here http://blogs.msdn.com/bclteam/archive/2005/03/16/396900.aspx
One very important note to make is that if you are working with WCF and cleaning up resources, you should ALMOST ALWAYS avoid the 'using' block. There are plenty of blog posts out there and some on MSDN about why this is a bad idea. I have also posted about it here - Don't use 'using()' with a WCF proxy
Using lambdas instead of IDisposable.
I have never been thrilled with the whole using/IDisposable idea. The problem is that it requires the caller to:
know that they must use IDisposable
remember to use 'using'.
My new preferred method is to use a factory method and a lambda instead
Imagine I want to do something with a SqlConnection (something that should be wrapped in a using). Classically you would do
using (Var conn = Factory.MakeConnection())
{
conn.Query(....);
}
New way
Factory.DoWithConnection((conn)=>
{
conn.Query(...);
}
In the first case the caller could simply not use the using syntax. IN the second case the user has no choice. There is no method that creates a SqlConnection object, the caller must invoke DoWithConnection.
DoWithConnection looks like this
void DoWithConnection(Action<SqlConnection> action)
{
using (var conn = MakeConnection())
{
action(conn);
}
}
MakeConnection is now private
nobody answered the question about whether you should implement IDisposable even though you dont need it.
Short answer : No
Long answer:
This would allow a consumer of your class to use 'using'. The question I would ask is - why would they do it? Most devs will not use 'using' unless they know that they must - and how do they know. Either
its obviuos the them from experience (a socket class for example)
its documented
they are cautious and can see that the class implements IDisposable
So by implementing IDisposable you are telling devs (at least some) that this class wraps up something that must be released. They will use 'using' - but there are other cases where using is not possible (the scope of object is not local); and they will have to start worrying about the lifetime of the objects in those other cases - I would worry for sure. But this is not necessary
You implement Idisposable to enable them to use using, but they wont use using unless you tell them to.
So dont do it
Dispose pattern:
public abstract class DisposableObject : IDisposable
{
public bool Disposed { get; private set;}
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
~DisposableObject()
{
Dispose(false);
}
private void Dispose(bool disposing)
{
if (!Disposed)
{
if (disposing)
{
DisposeManagedResources();
}
DisposeUnmanagedResources();
Disposed = true;
}
}
protected virtual void DisposeManagedResources() { }
protected virtual void DisposeUnmanagedResources() { }
}
Example of inheritance:
public class A : DisposableObject
{
public Component components_a { get; set; }
private IntPtr handle_a;
protected override void DisposeManagedResources()
{
try
{
Console.WriteLine("A_DisposeManagedResources");
components_a.Dispose();
components_a = null;
}
finally
{
base.DisposeManagedResources();
}
}
protected override void DisposeUnmanagedResources()
{
try
{
Console.WriteLine("A_DisposeUnmanagedResources");
CloseHandle(handle_a);
handle_a = IntPtr.Zero;
}
finally
{
base.DisposeUnmanagedResources();
}
}
}
public class B : A
{
public Component components_b { get; set; }
private IntPtr handle_b;
protected override void DisposeManagedResources()
{
try
{
Console.WriteLine("B_DisposeManagedResources");
components_b.Dispose();
components_b = null;
}
finally
{
base.DisposeManagedResources();
}
}
protected override void DisposeUnmanagedResources()
{
try
{
Console.WriteLine("B_DisposeUnmanagedResources");
CloseHandle(handle_b);
handle_b = IntPtr.Zero;
}
finally
{
base.DisposeUnmanagedResources();
}
}
}
If you are using other managed objects that are using unmanaged resources, it is not your responsibility to ensure those are finalized. Your responsibility is to call Dispose on those objects when Dispose is called on your object, and it stops there.
If your class doesn't use any scarce resources, I fail to see why you would make your class implement IDisposable. You should only do so if you're:
Know you will have scarce resources in your objects soon, just not now (and I mean that as in "we're still developing, it will be here before we're done", not as in "I think we'll need this")
Using scarce resources
Yes, the code that uses your code must call the Dispose method of your object. And yes, the code that uses your object can use using as you've shown.
(2 again?) It is likely that the WebClient uses either unmanaged resources, or other managed resources that implement IDisposable. The exact reason, however, is not important. What is important is that it implements IDisposable, and so it falls on you to act upon that knowledge by disposing of the object when you're done with it, even if it turns out WebClient uses no other resources at all.
Some aspects of another answer are slightly incorrect for 2 reasons:
First,
using(NoGateway objNoGateway = new NoGateway())
actually is equivalent to:
try
{
NoGateway = new NoGateway();
}
finally
{
if(NoGateway != null)
{
NoGateway.Dispose();
}
}
This may sound ridiculous since the 'new' operator should never return 'null' unless you have an OutOfMemory exception. But consider the following cases:
1. You call a FactoryClass that returns an IDisposable resource or
2. If you have a type that may or may not inherit from IDisposable depending on its implementation - remember that I've seen the IDisposable pattern implemented incorrectly many times at many clients where developers just add a Dispose() method without inheriting from IDisposable (bad, bad, bad). You could also have the case of an IDisposable resource being returned from a property or method (again bad, bad, bad - don't 'give away your IDisposable resources)
using(IDisposable objNoGateway = new NoGateway() as IDisposable)
{
if (NoGateway != null)
{
...
If the 'as' operator returns null (or property or method returning the resource), and your code in the 'using' block protects against 'null', your code will not blow up when trying to call Dispose on a null object because of the 'built-in' null check.
The second reason your reply is not accurate is because of the following stmt:
A finalizer is called upon the GC destroying your object
First, Finalization (as well as GC itself) is non-deterministic. THe CLR determines when it will call a finalizer. i.e. the developer/code has no idea. If the IDisposable pattern is implemented correctly (as I've posted above) and GC.SuppressFinalize() has been called, the the Finalizer will NOT be called. This is one of the big reasons to properly implement the pattern correctly. Since there is only 1 Finalizer thread per managed process, regardless of the number of logical processors, you can easily degrade performance by backing up or even hanging the Finalizer thread by forgetting to call GC.SuppressFinalize().
I've posted a correct implementation of the Dispose Pattern on my blog: How to Properly Implement the Dispose Pattern
1) WebClient is a managed type, so you don't need a finalizer. The finalizer is needed in the case your users don't Dispose() of your NoGateway class and the native type (which is not collected by the GC) needs to be cleaned up after. In this case, if the user doesn't call Dispose(), the contained WebClient will be disposed by the GC right after the NoGateway does.
2) Indirectly yes, but you shouldn't have to worry about it. Your code is correct as stands and you cannot prevent your users from forgetting to Dispose() very easily.
Pattern from msdn
public class BaseResource: IDisposable
{
private IntPtr handle;
private Component Components;
private bool disposed = false;
public BaseResource()
{
}
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
protected virtual void Dispose(bool disposing)
{
if(!this.disposed)
{
if(disposing)
{
Components.Dispose();
}
CloseHandle(handle);
handle = IntPtr.Zero;
}
disposed = true;
}
~BaseResource()
{ Dispose(false);
}
public void DoSomething()
{
if(this.disposed)
{
throw new ObjectDisposedException();
}
}
}
public class MyResourceWrapper: BaseResource
{
private ManagedResource addedManaged;
private NativeResource addedNative;
private bool disposed = false;
public MyResourceWrapper()
{
}
protected override void Dispose(bool disposing)
{
if(!this.disposed)
{
try
{
if(disposing)
{
addedManaged.Dispose();
}
CloseHandle(addedNative);
this.disposed = true;
}
finally
{
base.Dispose(disposing);
}
}
}
}
using(NoGateway objNoGateway = new NoGateway())
is equivalent to
try
{
NoGateway = new NoGateway();
}
finally
{
NoGateway.Dispose();
}
A finalizer is called upon the GC destroying your object. This can be at a totally different time than when you leave your method. The Dispose of IDisposable is called immediately after you leave the using block. Hence the pattern is usually to use using to free ressources immediately after you don't need them anymore.
From what I know, it's highly recommended NOT to use the Finalizer / Destructor:
public ~MyClass() {
//dont use this
}
Mostly, this is due to not knowing when or IF it will be called. The dispose method is much better, especially if you us using or dispose directly.
using is good. use it :)
I am writing an excel class and i want to release this unmanaged object automatically.
I'm using IDisposable pattern and write Dispose methods.
Example ;
class MSExcel : IDisposable
{
ApplicationClass excel;
bool disposed;
public MSExcel()
{
disposed = false;
excel = new ApplicationClass();
}
public void Dispose(bool disposing)
{
if (!this.disposed)
{
if (disposing)
{
}
excel.Quit();
disposed = true;
}
}
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
~MSExcel()
{
Dispose(false);
}
}
But i have classical error on exc.Quit().
"COM object that has been separated from its underlying RCW".
Have any my mistake in code?
As explained in my answer to your other related question here, you should not be taking actions on reference types from within your finalizer. You enforce this by making use of the bool disposing parameter of your Disposed(bool) method, as you have done. You pass in true, when Disposed(bool) is called explicitly from the void Dispose() method, and pass in false when called from your finalizer, which you have also done.
However, you also need to protect your call to excel.Quit() so that it is not called when Disposed(bool) is called via the finalizer. That is, you should only call excel.Quit() when the bool disposing argument is true.
Therefore, the code for your Disposed(bool) method should look as follows:
public void Dispose(bool disposing)
{
if (!this.disposed)
{
if (disposing)
{
excel.Quit();
}
disposed = true;
}
}
Once done, you could make use of your "MSExcel" class as follows:
using (MSExcel msExcel = new MSExcel)
{
// The code calling your 'MSExcel' object goes here.
}
By doing it this way, when your code gets to the closing bracket, "}", of your using statement block, the Dispose method on your 'MSExcel' class will be called automatically, ensuring that excel.Quit() is called deterministically, and not from a finalizer.
Hope this helps...
Mike