how to add eventsetter by code

Question

A complete example ``` public delegate void mouseup_delegate(object obj, MouseButtonEventArgs args); constructor() { TextBlock text_block = new TextBlock() { Text = "aa" }; Style style = new Style(); //style.Setters.Add(new EventSetter(){Event=TextBlock.MouseUpEvent, Handler=new mouseup_delegate(this.textblockClicked)}); style.Setters.Add(new EventSetter(TextBlock.MouseUpEvent, new mouseup_delegate(this.textblockClicked))); text_block.Style = style; } public void textblockClicked(object sender, MouseButtonEventArgs args) { MessageBox.Show("mouse up"); } ``` But when I run the app, an exception is thown: Handler type is not valid what's wrong with this code?

Accepted Answer

`EventSetter` expects the delegate you provide to be a `MouseButtonEventHandler`, not a `mouseup_delegate`.

how to add eventsetter by code

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