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// Used to determine if Dispose()

// has already been called.

private bool disposed = false;

public void Dispose()

{

// Call our helper method.

// Specifying "true" signifies that

// the object user triggered the cleanup.

CleanUp(true);

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8849CH08.qxd  10/22/07  1:27 PM  Page 263

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// Now suppress finalization.

GC.SuppressFinalize(this);

}

private void CleanUp(bool disposing)

{

// Be sure we have not already been disposed!

if (!this.disposed)

{

// If disposing equals true, dispose all

// managed resources.

if (disposing)

{

// Dispose managed resources.

}

// Clean up unmanaged resources here.

}

disposed = true;

}

~MyResourceWrapper()

{

// Call our helper method.

// Specifying "false" signifies that

// the GC triggered the cleanup.

CleanUp(false);

}

}

Notice that MyResourceWrapper now defines a private helper method named CleanUp(). When

specifying true as an argument, we are signifying that the object user has initiated the cleanup,

therefore we should clean up all managed 

and unmanaged resources. However, when the garbage

collector initiates the cleanup, we specify false when calling CleanUp() to ensure that internal dis-

posable objects are

not disposed (as we can’t assume they are still in memory!). Last but not least,

our bool member variable (disposed) is set to true before exiting CleanUp() to ensure that Dispose()

can be called numerous times without error.

To test our final iteration of MyResourceWrapper, add a call to Console.Beep() within the scope

of your finalizer:

~MyResourceWrapper()

{

Console.Beep();

// Call our helper method.

// Specifying "false" signifies that

// the GC triggered the cleanup.

CleanUp(false);

}

Next, update Main() as follows:

static void Main(string[] args)

{

Console.WriteLine("***** Dispose() / Destructor Combo Platter *****");