Question

I have a worker thread that needs to add items to a BindingList. However, the BindingList is databound to a DataGridView. So, when I try to add to the list, I get an InvalidOperationException (Cross-thread operation not valid: Control accessed from a thread other than the thread it was created on.)

Normally for this exception you would do:

if(winformControl.InvokeRequired) {
    winformControl.Invoke(MethodDelegate);
}

However, the databinding confuses things, as there is no Winform control in sight. All I have is the following line, which throws the exception:

ClassInstance.MyBindingList.Add(myObject);

If you have a solution specifically for this scenario, great.

If not, how can I get the worker thread to tell my main thread to perform a particular method (with several parameters supplied by the worker thread)? This may be a preferable option, since my worker thread is actually doing a bunch of stuff at the moment (like writing to the database), and I’m not sure if everything is thread-safe. I’m a student, and new to multithreading, and it really is not my forte yet.

Answer 1

You can fire an event to the main, UI, thread and there have:

if (this.InvokeRequired)
{
    this.Invoke(...);
}

so you are testing on the main Window itself.