Removing Icon from a WPF window

Question

I am able to remove the window icon from WPF window using WinApi\'s, however I get the icon again in the application window when I run just the executable of the WPF project

Answer 1

I have modified the sample from 'LnDCobra' so it can be used as an attached property (as 'Thomas' suggested:

Implementation of WindowEx:

public class WindowEx
  {
    private const int GwlExstyle = -20;
    private const int SwpFramechanged = 0x0020;
    private const int SwpNomove = 0x0002;
    private const int SwpNosize = 0x0001;
    private const int SwpNozorder = 0x0004;
    private const int WsExDlgmodalframe = 0x0001;

    public static readonly DependencyProperty ShowIconProperty =
      DependencyProperty.RegisterAttached(
        "ShowIcon",
        typeof (bool),
        typeof (WindowEx),
        new FrameworkPropertyMetadata(true, new PropertyChangedCallback((d, e) => RemoveIcon((Window) d))));


    public static Boolean GetShowIcon(UIElement element)
    {
      return (Boolean) element.GetValue(ShowIconProperty);
    }

    public static void RemoveIcon(Window window)
    {
      window.SourceInitialized += delegate {
        // Get this window's handle
        var hwnd = new WindowInteropHelper(window).Handle;

        // Change the extended window style to not show a window icon
        int extendedStyle = GetWindowLong(hwnd, GwlExstyle);
        SetWindowLong(hwnd, GwlExstyle, extendedStyle | WsExDlgmodalframe);

        // Update the window's non-client area to reflect the changes
        SetWindowPos(hwnd, IntPtr.Zero, 0, 0, 0, 0, SwpNomove |
          SwpNosize | SwpNozorder | SwpFramechanged);
      };
    }

    public static void SetShowIcon(UIElement element, Boolean value)
    {
      element.SetValue(ShowIconProperty, value);
    }

    [DllImport("user32.dll")]
    private static extern int GetWindowLong(IntPtr hwnd, int index);

    [DllImport("user32.dll")]
    private static extern IntPtr SendMessage(IntPtr hwnd, uint msg,
      IntPtr wParam, IntPtr lParam);

    [DllImport("user32.dll")]
    private static extern int SetWindowLong(IntPtr hwnd, int index, int newStyle);

    [DllImport("user32.dll")]
    private static extern bool SetWindowPos(IntPtr hwnd, IntPtr hwndInsertAfter,
      int x, int y, int width, int height, uint flags);
  }
}