If you’re developing something like a WPF app and you’ll need to update values on the User Interface based on a long-running operation that runs in a background thread (like depicted here), you’ll probably need to use Dispatcher, or otherwise you’ll run into issues with the GUI elements being owned by another thread, and therefore forbidding access to them. This can result in an error like this:
An unhandled exception of type 'System.InvalidOperationException' occurred in WindowsBase.dll
Additional information: The calling thread cannot access this object because a different thread owns it.
Luckily, there’s a quick workaround available. Read on!