Accessing UI (Main) Thread safely in WPF

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You can use

Dispatcher.Invoke(Delegate, object[])

on the Application‘s (or any UIElement‘s) dispatcher.

You can use it for example like this: 

Application.Current.Dispatcher.Invoke(new Action(() => { /* Your code here */ }));

or 

someControl.Dispatcher.Invoke(new Action(() => { /* Your code here */ }));

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