c# - "Current thread must be set to single thread apartment (STA)" error in copy string to clipboard

Question

I have tried code from How to copy data to clipboard in C#:

Clipboard.SetText("Test!");

And I get this error:

Current thread must be set to single thread apartment (STA) mode before OLE calls can be made. Ensure that your Main function has STAThreadAttribute marked on it.

How can I fix it?

Answer 1

If you can't control whether thread runs in STA mode or not (i.e. tests, plugin to some other app or just some code that randomly sends that call to run on no-UI thread and you can't use Control.Invoke to send it back to main UI thread) than you can run clipboard access on thread specifically configured to be in STA state which is required for clipboard access (which internally uses OLE that actually requires STA).

Thread thread = new Thread(() => Clipboard.SetText("Test!"));
thread.SetApartmentState(ApartmentState.STA); //Set the thread to STA
thread.Start(); 
thread.Join(); //Wait for the thread to end