Question

    Action<SPItemEventProperties> deleteAction = DeleteWorkspace;
    AsyncCallback deleteDone = deleteAction.EndInvoke;
    SPSecurity.RunWithElevatedPrivileges(() => deleteAction.BeginInvoke(properties, deleteDone, null));

So this is suppose to call DeleteWorkspace Asynchronously and then call EndInvoke when its done, I wrote it but I am not positive it will work properly. I stepped through and it appears to work but the syntax is making me second guess myself cause I have never seen it done like this on the net…

Comments?

Answer 1

It should work, but to really understand it let’s pretend it were written like this:

void RunAsync<T>(Action<T> action)
{
    AsyncCallback Done = action.EndInvoke;
    SPSecurity.RunWithElevatedPrivileges(() => action.BeginInvoke(properties, Done, null));
}

RunAsync(DeleteWorkspace);

Note that in the code above, it looks like the ‘Done’ callback will go out of scope right away. However, the compiler will capture (close over) it with a closure, so that it’s available when needed.