如何使用C＃裁剪图像？

您可以用来

Graphics.DrawImage

Rectangle cropRect = new Rectangle(...);Bitmap src = Image.FromFile(fileName) as Bitmap;Bitmap target = new Bitmap(cropRect.Width, cropRect.Height);using(Graphics g = Graphics.FromImage(target)){   g.DrawImage(src, new Rectangle(0, 0, target.Width, target.Height),          cropRect,GraphicsUnit.Pixel);}