WPF 获取屏幕某个点的颜色

我在做一个笔迹性能测试工具，想要在笔迹绘制到某个点的时候输出绘制的速度，通过判断屏幕颜色修改判断笔迹绘制到哪。此时需要在不截图屏幕获取屏幕某个点的颜色

本文的方法可以在 WinForms 等使用

  using System;
  using System.Drawing;
  using System.Runtime.InteropServices;
  sealed class Win32
  {
      [DllImport("user32.dll")]
      static extern IntPtr GetDC(IntPtr hwnd);

      [DllImport("user32.dll")]
      static extern Int32 ReleaseDC(IntPtr hwnd, IntPtr hdc);

      [DllImport("gdi32.dll")]
      static extern uint GetPixel(IntPtr hdc, int nXPos, int nYPos);

      static public System.Drawing.Color GetPixelColor(int x, int y)
      {
       IntPtr hdc = GetDC(IntPtr.Zero);
       uint pixel = GetPixel(hdc, x, y);
       ReleaseDC(IntPtr.Zero, hdc);
       Color color = Color.FromArgb((int)(pixel & 0x000000FF),
                    (int)(pixel & 0x0000FF00) >> 8,
                    (int)(pixel & 0x00FF0000) >> 16);
       return color;
      }
   }