如何直接在Windows桌面C＃上绘制？

请尝试以下 *** 作：

using System;using System.Drawing;using System.Drawing.Drawing2D;using System.Runtime.InteropServices;class Program {    [Dllimport("User32.dll")]    static extern IntPtr GetDC(IntPtr hwnd);    [Dllimport("User32.dll")]    static extern int ReleaseDC(IntPtr hwnd, IntPtr dc);    static void Main(string[] args) {        IntPtr desktop = GetDC(IntPtr.Zero);        using (Graphics g = Graphics.FromHdc(desktop)) { g.FillRectangle(Brushes.Red, 0, 0, 100, 100);        }        ReleaseDC(IntPtr.Zero, desktop);    }}