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string path = Server.MapPath("images\\test.jpg");
System.Drawing.Image img = System.Drawing.Image.FromFile(path);
Graphics g = Graphics.FromImage(img);
SolidBrush s = new SolidBrush(Color.Red);
Font f = new Font("黑体",20);
g.DrawString("test", f, s, 50, 50);
img.Save(Response.OutputStream,System.Drawing.Imaging.ImageFormat.Jpeg);