如何使用c#获取X,Y处像素的颜色？

using System.Drawing;
using System.Drawing.Imaging;

// 获取屏幕尺寸
int screenWidth = Screen.PrimaryScreen.Bounds.Width;
int screenHeight = Screen.PrimaryScreen.Bounds.Height;

// 创建一个位图，用于保存屏幕截图
Bitmap screenshot = new Bitmap(screenWidth, screenHeight, PixelFormat.Format32bppArgb);

// 创建一个图形对象，用于将屏幕截图保存到位图中
Graphics graphics = Graphics.FromImage(screenshot);

// 将屏幕内容复制到位图中
graphics.CopyFromScreen(0, 0, 0, 0, screenshot.Size);

// 获取指定位置的像素颜色
int x = 100;
int y = 100;
Color pixelColor = screenshot.GetPixel(x, y);

// 显示像素颜色
MessageBox.Show($"Pixel color at ({x}, {y}): {pixelColor}");