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 documentation says
You should implement IDisposable only if your type uses unmanaged resources directly.
Coming from a mostly Java background, this sounds strange to me. Suppose I have a class that contains an IDisposable member:
class Foo : IDisposable {
private StreamWriter sw;
...
}
... and suppose this class is used, for example, as a sort of filter that takes strings and modifies them and then outputs them with the StreamWriter sw. I want to use this class like a sort of Writer.
Why wouldn't I want to implement Dispose(bool) which would call sr.Dispose()? This is what I would have to do if I were coding it in Java (the Java Closable interface is similar to .NET's IDisposable, though in some ways different). Yet the documentation says I shouldn't, because I'm not directly using unmanaged resources.
If I don't override Dispose(bool), how does the managed resource sw get disposed when I leave the block started by the using statement?
You should implement IDisposable when your class contains an IDisposable field such as for example a StreamWriter.
In this case you can assume that your type does use unmanaged resources (through the StreamWriter class) under the hood, and you should always dispose any object that implements the IDisposable interface as soon as you are done using them.
Why wouldn't I want to implement IDisposable(bool) which would call sr.Dispose()?
You certainly would.
If I don't override Dispose(bool), how does the managed resource sw get disposed when I leave the block started by the using statement?
It doesn't. The underlying unmanaged resource(s) may eventually be released by the finalizer (depending on the implementation of the IDisposable class) but the managed object won't be disposed unless you explicitly dispose it in your class.
When you use an instance that implements the IDisposable interface, it's best practice to use it as a local variable inside a using statement.
However, that's not always possible.
In some cases you must include a field that implements the IDisposable interface. In these cases, you should also implement it yourself and dispose them in your class Dispose(bool) method.
For instance, Suppose you want to schedule a task. One fairly easy implementation is to use a class that contains a System.Timers.Timer field, a start, stop, and doWork method.
In such a case you can't use the timer as a local variable, it must be a field, and therefor your class should implement the IDisposable interface and dispose the timer on it's Dispose(bool) method.
Here is a simplified code example (a bit too simplified, I guess, but good enough for this demonstration)
public abstract class Schedualer : IDisposable
{
private Timer _timer;
public Schedualer(double interval)
{
_timer = new Timer(interval);
_timer.Elapsed += _timer_Elapsed;
}
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
protected virtual void Dispose(bool disposing)
{
if (disposing)
{
if (_timer != null)
{
_timer.Elapsed -= _timer_Elapsed;
_timer.Dispose();
}
}
}
protected abstract void OnTimerElapsed();
protected void StartTimer()
{
_timer.Start();
}
protected void StopTimer()
{
_timer.Stop();
}
private void _timer_Elapsed(object sender, ElapsedEventArgs e)
{
_timer.Stop();
try
{
TimerElapsed();
}
finally
{
_timer.Start();
}
}
}
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 working on a project where a certain class hierarchy implements IDisposable.
Some of the classes also implement a Finalize method ( ~MyClass() )
In general it looks something like this:
public class BaseClass : IDisposable
{
}
public class SomeClass : BaseClass
{
~SomeClass()
{
Dispose();
}
Dispose()
{
// Do some stuff.
base.Dispose();
}
}
public class AnoterClass : SomeClass
{
~AnoterClass()
{
Dispose();
}
Dispose()
{
// Do some stuff.
base.Dispose();
}
}
I'd like to know what is the proper way of handling calls to Dispose, as it seems that these objects are being disposed by calling Dispose(), and later on crash since the Finalize method is called.
Is it best to keep a flag at the lowest class in the hierarchy (protected bool disposed), and check that in every level of the class hierarchy?
I find that every possible solution requires some code duplication, which is not what i'm after.
You need to suppress finalization if you are manually disposing of your objects.
The pattern to follow is here
Edit:
I think you only need to implement at a particular level of class hierarchy if you have something new to dispose at that level, otherwise I believe that the disposal in the base class will do everything that you need. If your implementation in any particular class just calls base.Dispose(disposing) then it is not needed, if it has to do some clean uop, then call base.Dispose() then you need it.
Having a protected flag as you suggest should be fine.
If your base class implements the standard IDisposable pattern, all you need to do is add the Dispose(bool disposing) override to each derived class that itself owns IDisposable or unmanaged resources:
protected override void Dispose(bool disposing)
{
try
{
if (disposing)
{
// Release managed resources
}
// Release unmanaged resources
}
finally
{
base.Dispose(disposing);
}
}
You shouldn't implement finalizers in any of the derived classes.
And, of course, any classes in the hierarchy that don't have their own IDisposable resources don't need this override.
Basically I have a few functions that look like this:
class MyClass
{
void foo()
{
using (SomeHelper helper = CreateHelper())
{
// Do some stuff with the helper
}
}
void bar()
{
using (SomeHelper helper = CreateHelper())
{
// Do some stuff with the helper
}
}
}
Under the assumption I can use the same resource instead of a different one [instance] in every function is it ok practice in regard to cleanup and such to do this?:
class MyClass
{
SomeHelper helper = CreateHelper();
// ...foo and bar that now just use the class helper....
~MyClass()
{
helper.Dispose();
}
}
No, do not add a destructor (Finalizer).
You can reuse the resource but then your class has to implement IDisposable.
sealed class MyClass : IDisposable
{
SomeHelper helper = CreateHelper();
// ...foo and bar that now just use the class helper....
//~MyClass()
public void Dispose()
{
helper.Dispose();
}
}
And now you have to use MyClass instances in a using block. It self has become a managed resource .
A destructor is of no use, whenever a MyClass instance is being collected the associated helper object will also be in the same collection. But having a destructor still incurs considerable overhead.
The standard pattern for IDisposable uses a virtual void Dispose(bool disposing) method but when making the class sealed you can use the minimalistic implementation above.
In .NET you don't know when (or whether) finalizer is called at all.
Instead, explicitly indicate that your class is to be disposed of by implementing IDisposable:
(This is exactly what SomeHelper does)
class MyClass : IDisposable
{
readonly SomeHelper helper = CreateHelper();
// any method can use helper
public void Dispose()
{
helper.Dispose();
}
}
using(var myObj = new MyClass()) {
// at the end, myObj.Dispose() will trigger helper.Dispose()
}
I used readonly to ensure helper doesn't get re-assigned somewhere else in the class, but this really doesn't matter if you're careful.
You must be extra careful to never set it to null, or your Dispose will throw an exception. If the field is protected, you can check for nullity before calling Dispose on it so you know you're playing safe.
You can share such a resource during the lifetime of your object, in which case it is recommended that you implement IDisposable.
No, it is not. You don't know when the finalized will un. Also, if your resource is managed, it will be disposed of at some point without the finalized.
If you don't want to use using all the time, perhaps ou can use it once around many functions.
You don't need to override the finalizer in your object, which you have shown in your second code sample by ~MyClass().
You will need to implement the IDisposable pattern. You haven't been explicit in your question if you are using managed and unmanaged resources, but here's a quick sample for a managed resource. Stackoverflow has a myriad of examples on this. Reed Copsey also has a good series on it, and you can start here.
class MyClass : IDisposable
{
private bool _Disposed;
private SomeHelper _Helper;
protected virtual void Dispose()
{
this.Dispose(true);
}
public void Dispose(bool disposing)
{
if (_!Disposed && disposing)
{
if (_Helper != null)
_Helper.Dispose();
_Disposed = true;
}
}
}
The convention is that if your class owns an IDisposable object it should also implement IDisposable. So rather than implementing a finalizer your class should implement IDisposable and dipose of the helper there.
One problem with implementing the finalizer is that you have no control over when it's being called. The disposable pattern gives you a more deterministic way of cleaning up resources.