Set brush to Window background : Window Style « Windows Presentation Foundation « C# / CSharp Tutorial

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C# / CSharp Tutorial » Windows Presentation Foundation » Window Style 
24.72.7.Set brush to Window background
using System;
using System.Windows;
using System.Windows.Input;
using System.Windows.Media;

    class MainClass: Window
    {
        LinearGradientBrush brush;

        [STAThread]
        public static void Main()
        {
            Application app = new Application();
            app.Run(new MainClass());
        }
        public MainClass()
        {
            Title = "title";
            SizeChanged += WindowOnSizeChanged;

            brush = new LinearGradientBrush(Colors.Red, Colors.Blue, 0);
            brush.MappingMode = BrushMappingMode.Absolute;
            Background = brush;
        }
        void WindowOnSizeChanged(object sender, SizeChangedEventArgs args)
        {
            double width = 200;
            double height = 200;

            Point ptCenter = new Point(width / 3, height / 3);
            Vector vectDiag = new Vector(width, -height);
            Vector vectPerp = new Vector(vectDiag.Y, -vectDiag.X);

            vectPerp.Normalize();
            vectPerp *= width * height / vectDiag.Length;

            brush.StartPoint = ptCenter + vectPerp;
            brush.EndPoint = ptCenter - vectPerp;
        }
    }
24.72.Window Style
24.72.1.Window BackgroundWindow Background
24.72.2.Create a non-rectangular windowCreate a non-rectangular window
24.72.3.Transparent WindowTransparent Window
24.72.4.Non-Rectangular windowNon-Rectangular window
24.72.5.Windows Transparent BackgroundWindows Transparent Background
24.72.6.Set WindowStyle = WindowStyle.ToolWindow
24.72.7.Set brush to Window background
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