Avoid calling Invoke when the control is disposed

Question

I have the following code in my worker thread (ImageListView below is derived from Control):

if (mImageListView != null && 
    mImageListView.IsHandleCreated &&
    !mImageListView.IsDisposed)
{
    if (mImageListView.InvokeRequired)
        mImageListView.Invoke(
            new RefreshDelegateInternal(mImageListView.RefreshInternal));
    else
        mImageListView.RefreshInternal();
}

However, I get an ObjectDisposedException sometimes with the Invoke method above. It appears that the control can be disposed between the time I check IsDisposed and I call Invoke. How can I avoid that?

Answer 1

What you have here is a race condition. You're better off just catching the ObjectDisposed exception and be done with it. In fact, I think in this case it is the only working solution.

try
{
    if (mImageListView.InvokeRequired)
       mImageListView.Invoke(new YourDelegate(thisMethod));
    else
       mImageListView.RefreshInternal();
} 
catch (ObjectDisposedException ex)
{
    // Do something clever
}