WPF – Create Irregular (Non-Rectangular) Borderless Windows

With Windows Presentation Foundation (WPF), it’s easy to craft irregular, non-rectangular top-level windows without borders to create a unique splash screen or a gadget-style user interface:

• Modify the Window Properties
  • Set AllowTransparency property to true.
  • Set WindowStyle to None to remove window chrome
  • Set Background to Transparent
• Add support for moving and closing the window if needed
  • Use the Window’s DragMove() method to allow users to reposition the Window
  • Add a UI element to allow users to close the window

void Window_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
    // DragMove handles all the window placement automatically!
    this.DragMove();
}

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