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As garbage collection can't clear unmanaged code.To clear unmanaged code we use dispose method,but can vice versa possible?can we clear manage code object using dispose method?
A Dispose method implementation might set some fields to null, potentially making "child" objects eligible for garbage collection even if the containing object itself isn't eligible for garbage collection.
It can't forcibly delete objects though - the closest it could come would be to call GC.Collect.
Dispose certainly doesn't have to clear fields at all though - for example, with MemoryStream, you can access the data within the stream (via ToArray or GetBuffer) even after disposing of it.
Usually it's better (IMO) to just let the garbage collector get on with what it's good at.
If you really need to force this - you could implement IDisposable on your class and then use it within a using(){} block once it falls out of scope it will be cleaned up on the next GC.Collect cycle, which can be forced by calling the method.
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I am curious about how clr knows particular object is not used by any other object and it is dead we know the basic of garbage collector but internally how clr find dead object.How clr knows the objects are in dead position.
https://msdn.microsoft.com/en-us/library/ee787088(v=vs.110).aspx#Anchor_4
A garbage collection has the following phases:
A marking phase that finds and creates a list of all live objects.
A relocating phase that updates the references to the objects that
will be compacted.
A compacting phase that reclaims the space occupied by the dead
objects and compacts the surviving objects. The compacting phase
moves objects that have survived a garbage collection toward the
older end of the segment.
The garbage collector uses the following information to determine whether objects are live:
Stack roots. Stack variables provided by the just-in-time (JIT)
compiler and stack walker.
Garbage collection handles. Handles that point to managed objects and
that can be allocated by user code or by the common language runtime.
Static data. Static objects in application domains that could be
referencing other objects. Each application domain keeps track of its
static objects.
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Just trying to understand the out of memory exception in dot net.
If I create a infinite while loop and in the loop I create a new object and that object writes something to a file.
Will this application run out of memory? Will this cause out of memory exception?
An OutOfMemoryException is thrown whenever the application tries and fails to allocate memory to perform an operation. According to Microsoft's documentation, the following operations can potentially throw an OutOfMemoryException:
Boxing (i.e., wrapping a value type in an Object)
Creating an array
Creating an object
If you try to create an infinite number of objects, then it's pretty reasonable to assume that you're going to run out of memory sooner or later.
(Note: don't forget about the garbage collector. Depending on the lifetimes of the objects being created, it will delete some of them if it determines they're no longer in use.)
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I want to know suppose I create an object and then use
(IDisposable(object)).Dispose() after using that object.
Will this help me to improve my performance?Or should I wait for GarbageCollector to collect that object?
The primary use of this interface is to release unmanaged resources. The garbage collector automatically releases the memory allocated to a managed object when that object is no longer used. However, it is not possible to predict when garbage collection will occur. Furthermore, the garbage collector has no knowledge of unmanaged resources such as window handles, or open files and streams.
Use the Dispose method of this interface to explicitly release unmanaged resources in conjunction with the garbage collector. The consumer of an object can call this method when the object is no longer needed
ref:
http://msdn.microsoft.com/en-us/library/system.idisposable(v=vs.110).aspx
A more detailed description
http://www.codeproject.com/Articles/413887/Understanding-and-Implementing-IDisposable-Interfa
Its purely depends on the context which we used, for example objects like DB connection objects usually needs to be disposed, any stream related operations needs to be disposed. It's not necessary to dispose every object which we create, most of them are handled by GC.
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I have recently encountered an issue that is related to code running in the Finalize method overload.
I am mostly aware of issues that are related to memory management/performance, but i am interested whether there are any guidelines for "which code should/shouldn't go in a Finalize method" ?
For example:
Do not throw exceptions from within a Finalize method.
Code should execute quickly.
Do not raise events (?)
Etc...
The behaviour in my case was seen due to an event being raised that caused some exception.
So my question is -- what guidelines must i follow (perhaps even enforce using some tools) regarding finalize methods?
Finalizing is ONLY for getting rid of unmanaged resources
From MSDN
If Finalize or an override of Finalize throws an exception, and the runtime is not hosted by an application that overrides the default policy, the runtime terminates the process and no active try-finally blocks or finalizers are executed. This behavior ensures process integrity if the finalizer cannot free or destroy resources.
Finalize operations have the following limitations:
The exact time when the finalizer executes during garbage collection is undefined. Resources are not guaranteed to be released at any specific time, unless calling a Close method or a Dispose method.
The finalizers of two objects are not guaranteed to run in any specific order, even if one object refers to the other. That is, if Object A has a reference to Object B and both have finalizers, Object B might have already finalized when the finalizer of Object A starts.
The thread on which the finalizer is run is unspecified
There should be no reason you're calling finalize. Even though it's open to you for overriding, the best practice in using finalize is not to use them. Instead, inherit from IDisoposable. Not only is this a best practice, it doesn't interfere with garbage collection, and has the convenient ''using'' clause to auto dispose. Inheriting this class also notes to other developers that this is an object that has resources to dispose of, and I'm a particular manner. I even think the GC will call dispose during its garbage run.
In short, anything you can do with finalize is better done with dispose.
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Imagine you're writing a library. Say, this library is going to be used in 24/7 server application. There are some unmaneged resourses, wrapped in your public API, so you implement Disposable pattern( you may even implement finalizers)
Normally, you would use using statement to free the unmanaged resources. But you are writing just a library, not a final application. What if another programmer 'forgotten' to call Dispose()? You are going to get resource leak in your lib!
We could rely on finalizers, but there is no guarantee that a finalizer would ever been called.
So, is there a way to guarantee that somehow the unmanaged resources would be freed? Any ideas?
There is no solution except documenting your classes. Write explicitly in your documentation how your classes are meant to be used (i.e. they are meant to be disposed at the earliest possible time, possibly with using, or with an explicit call to Dispose).
You are no more responsible for memory leaks if your consumer does not properly dispose its object than industrials are responsible for the pollution if people trash their garbage in the wild.
You could hope that the server application has code analysis rule CA2213: Disposable fields should be disposed enabled.
Otherwise I don't know if there is a way to guarantee that they call your Dispose() method.