How to check if object has been disposed in C#

c# .net dispose
jethro picture jethro · Aug 11, 2010 · Viewed 129.8k times · Source

Possible Duplicate:
How does one tell if an IDisposable object reference is disposed?

Is there a method to check if object has been disposed different then

try
{
    myObj.CallRandomMethod();
} catch (ObjectDisposedException e)
{
    // now I know object has been disposed
}

In my case I'm using TcpClient class that has Close() method which disposes object and this can happen in piece of code I don't have control of. In this case I would like to have better solution then catching exception.

Answer

Luca picture Luca · Aug 11, 2010

The reliable solution is catching the ObjectDisposedException.

The solution to write your overridden implementation of the Dispose method doesn't work, since there is a race condition between the thread calling Dispose method and the one accessing to the object: after having checked the hypothetic IsDisposed property , the object could be really disposed, throwing the exception all the same.

Another approach could be exposing a hypothetic event Disposed (like this), which is used to notify about the disposing object to every object interested, but this could be difficoult to plan depending on the software design.

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