Does it matter if you implement IDisposable explicitly in your classes?
When doing so, it is recommended that you make the implementation of Close identical to Dispose… Consider implementing interface members explicitly to hide a member and add an equivalent member with a better name. Occasionally a specific domain name is more appropriate than Dispose.
Table of Contents
Why implement IDisposable?
in a class, you must implement IDisposable and override the Dispose method to allow you to control when memory is freed. Otherwise, this responsibility is left to the garbage collector to release memory when the object containing the unmanaged resources is finalized.
Why do we need to implement the Dispose method while we have the option to implement the destructor?
Because you can’t control when (or even if) the GC calls Finalize, you should treat destructors only as a fallback mechanism for freeing up unmanaged resources. Instead, the approved way to free unmanaged resources is to have your class inherit from the IDisposable interface and implement the Dispose() method.
When does a class need to implement IDisposable?
If a class contains an IDisposable implementation as an instance member, be it a field or a property, the class must also implement IDisposable. For more information, see Implement a Cascade Delete.
How to implement IDisposable interface in Java?
Dispose() must call Dispose(true), and the finalizer must call Dispose(false). If you create an unsealed type that declares and implements the IDisposable interface, you must define Dispose(bool) and call it.
When to use explicit implementation in C#?
To implement both interfaces, a class has to use an explicit implementation for property P, or method P, or both, to avoid a compile error. For example: Starting with C# 8.0, you can define an implementation for members declared in an interface. If a class inherits the implementation of a method from an interface,
How to dispose of an object that implements IDisposable?
When you are done using an object that implements IDisposable, you must call the object’s IDisposable.Dispose implementation. You can do this in one of two ways: with the C# using statement or the Visual Basic using statement. Implementing a try/finally block.
Should the interface inherit from IDisposable?
In general, when binding to an interface, it’s best for that interface to inherit IDisposable rather than the base class; if your interface doesn’t inherit IDisposable, you have to cast to IDisposable to get rid of the object, and that risks an InvalidCast…
What happens if you don’t dispose of IDisposable?
Once the objects are no longer in use, the system will eventually clean them up, but that process requires more CPU time than if you had called Dispose when done with the objects. You can also read about the use of IDisposable here and here.
Can an interface implement IDisposable?
Concrete types can implement IDisposable, but interfaces cannot, since IDisposable is an implementation detail.
Why is the await handle IDisposable in .net?
WaitHandle is IDisposable because it contains a SafeWaitHandle internally, which is IDisposable.
When to use IDisposable and dispose in a class?
Your class has such a field; therefore, you should implement IDisposable. Whenever possible, a class that requires cleanup should be designed so that calling IDisposable.Dispose on it is sufficient to do any and all cleanup that is required.
Do you need to override the protected dispose method on waithandle?
WaitHandle implements the Dispose pattern. See Implementing a Dispose Method. When you derive from WaitHandle, use the SafeWaitHandle property to store the handle of your native operating system. You don’t need to override the protected Dispose method unless you use additional unmanaged resources.
When do I derive from the waithandle class?
When you derive from WaitHandle, use the SafeWaitHandle property to store the handle of your native operating system. You don’t need to override the protected Dispose method unless you use additional unmanaged resources. Initializes a new instance of the WaitHandle class. Represents an invalid native operating system identifier.
What is the correct way to call Dispose from a finalizer?
Dispose() should call Dispose(true) and the finalizer should call Dispose(false) . If you create an unsealed type that declares and implements the IDisposable interface, you must define Dispose(bool) and call it. For more information, see Clean Up Unmanaged Resources (.NET Guide) and Dispose pattern.
Is Dispose automatically called?
Dispose() will not be called automatically. If there is a finalizer, it will be called automatically. The IDisposable implementation provides a way for users of your class to release resources sooner, rather than waiting for the garbage collector.
When to use finalize vs dispose?
The finalize() method is called by the garbage collector. The dispose( ) method is used to release unmanaged resources each time it is called. The finalize() method is used to release unmanaged resources before the object is destroyed. The dispose() method must be implemented whenever there is a close() method.
What is the difference between the Finalize() and Dispose() methods?
The main difference between dispose() and finalize() is that the user must explicitly call the dispose() method, while the garbage collector calls the finalize() method, just before the object is destroyed.
When to call Dispose method on IDisposable?
MyResource (IntPtr handle, Component^ component) { this->handle = handle; this->component = component; discarded = false; } // This method is called if the user explicitly disposes of the // object (by calling the Dispose method in other managed languages, // or the destructor in C++).
When to call dispose(false) in the destructor?
// If dispose equals true, the method has been called directly // or indirectly by a user’s code. Managed and unmanaged resources // can be deleted. // If dispose equals false, the runtime // has called the method from within the finalizer and should not reference // other objects.
When to call GC SuppressFinalize in delete method?
However, if the Dispose method has been called, it is not normally necessary for the garbage collector to call the finalizer of the disposed object. To prevent automatic completion, implementations of Dispose can call the GC.SuppressFinalize method.