Empty Dispose() method C#

user_7509544 0
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I have just started learning about IDisposable and Dispose(). I also read about the concept of unmanaged resources and several use cases on Dispose().

However, I have come across empty Dispose() methods in some of the source code I am studying. I have read all the posts on empty Dispose() on this forum but still do not understand it.

May I ask what is the purpose of having empty Dispose() method and why is this implemented in the first place?

Code:

public class Counter : IDisposable
{
    public double AverageCount { get { return Count.AverageCount; }}
    ...
    public readonly Counter Counter;
    internal ReadOnlyCounter(Counter counter)
    {
        Counter = counter;
    }
    
    public void Dispose() { }
}
c#
2 Answers

In the example given, it serves no purpose whatsoever.

In some cases, an empty Dispose() is there because the type is being used in a polymorphic way, and some types that implement the same pattern might need disposal - MemoryStream being a good example of this (for many Stream types, disposal is necessary - so it is useful to enforce it at the base Stream type - but: MemoryStream doesn't have anything interesting to say here).

If the empty Dispose() method was virtual, it might make more sense - but again: that's getting back into polymorphism.

Marc_Gravell_233540

One other reason to implement IDisposable would be to use the code in using blocks, which may make the business logic easier to read.

using(new Counter())
{
     // Some code relying on this counter
}

But since every reader would assume some code to be called on the closing bracket and be surprised that there is none, I do not known if it is a good reason.

user_2760700
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