Dispatcher.BeginInvoke , trying to use lambda to get string set from textblock, but getting conversion error

Question

I am trying to call a selected listbox item from a button, not the listbox.selecteditemchanged method in wpf. So when i try

string yadda = listbox.SelectedItem.ToString();

i get an exception:

The calling thread cannot access this object because a different thread owns it.

So, what i was trying to do is the following:

Dispatcher.BeginInvoke(() =>
                    {
                        lbxSelectedItem =  (lbxFileList.SelectedItem as TextBlock).Text;
                    });

That is not working either because i get another exception:

Cannot convert lambda expression to type 'System.Delegate' because it is not a delegate type

Answer 1

Convert the lambda to an Action:

Dispatcher.BeginInvoke((Action)(() => { /*DoStuff*/ }));

Or construct one from the lambda:

Dispatcher.BeginInvoke(new Action(() => { /*DoStuff*/ }));

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You probably can write an extension method for the Dispatcher that takes an Action, that way the lambda would be implicitly converted.