C#实现在服务器端裁剪图片的方法

//图片路径String oldPath = Server.MapPath("~/62223231.jpg");//新图片路径String newPath = System.IO.Path.GetExtension(oldPath);//设置截取的坐标和大小int x = 0, y = 20, width = 200, height = 2400;//计算新的文件名，在旧文件名后加_newnewPath = oldPath.Substring(0, oldPath.Length - newPath.Length) + "_new" + newPath;Response.Write(oldPath);Response.Write("<br>");Response.Write(newPath);//定义截取矩形System.Drawing.Rectangle cropArea = new System.Drawing.Rectangle(x, y, width, height); //要截取的区域大小//加载图片System.Drawing.Image img = System.Drawing.Image.FromStream(new System.IO.MemoryStream(System.IO.File.ReadAllBytes(oldPath)));//判断超出的位置否if ((img.Width < x + width) || img.Height < y + height){ Response.Write("截取的区域超过了图片本身的高度、宽度."); img.Dispose(); return;}//定义Bitmap对象System.Drawing.Bitmap bmpImage = new System.Drawing.Bitmap(img);//进行裁剪System.Drawing.Bitmap bmpCrop = bmpImage.Clone(cropArea, bmpImage.PixelFormat);//保存成新文件bmpCrop.Save(newPath);//释放对象img.Dispose();bmpCrop.Dispose();