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"]) ? 0 : int.Parse(context.Request.Params["h"]);//截图的高度 int maxWidth = string.IsNullOrEmpty(context.Request.Params["maxWidth"]) ? 0 : int.Parse(context.Request.Params["maxWidth"]);//最大宽 int maxHeight = string.IsNullOrEmpty(context.Request.Params["maxHeight"]) ? 0 : int.Parse(context.Request.Params["maxHeight"]);//最大高 string fileExt = Path.GetExtension(src);//图片格式 string fileName = Guid.NewGuid().ToString("N") + fileExt; string savePath = "/uploadfiles/test/" + DateTime.Now.ToString("yyyyMM") + "/" + fileName; CutImage(GetReducedImage(file, maxHeight, maxHeight), x, y, w, h, savePath, context); return "{\"code\":0,\"src\":\"" + savePath + "\"}"; } /// <summary> /// 生成缩略图重载方法1，返回缩略图的Image对象 /// </summary> /// <param name="Width">缩略图的宽度</param> /// <param name="Height">缩略图的高度</param> /// <returns>缩略图的Image对象</returns> public Bitmap GetReducedImage(Image ResourceImage, int Width, int Height) { try { //用指定的大小和格式初始化Bitmap类的新实例 Bitmap bitmap = new Bitmap(Width, Height, PixelFormat.Format32bppArgb); //从指定的Image对象创建新Graphics对象 Graphics graphics = Graphics.FromImage(bitmap); //清除整个绘图面并以透明背景色填充 graphics.Clear(Color.Transparent); //在指定位置并且按指定大小绘制原图片对象 graphics.DrawImage(ResourceImage, new Rectangle(0, 0, Width, Height)); return bitmap; } catch (Exception e) { return null; } } /// <summary> /// 截取图片方法 /// </summary> /// <param name="bitmap">原图</param> /// <param name="beginX">开始位置-X</param> /// <param name="beginY">开始位置-Y</param> /// <param name="width">截取宽度</param> /// <param name="height">截取长度</param> /// <param name="path">保存路径</param> /// <param name="context">上下文</param> public static void CutImage(Bitmap bitmap, int beginX, int beginY, int width, int height, string path, HttpContext context) { if (beginX + width > bitmap.Width) beginX = bitmap.Width - width; if (beginY + height > bitmap.Height) beginY = bitmap.Height - height; Bitmap destBitmap = new Bitmap(width, height);//目标图 Rectangle destRect = new Rectangle(0, 0, width, height);//矩形容器 Rectangle srcRect = new Rectangle(beginX, beginY, width, height); Graphics g = Graphics.FromImage(destBitmap); g.DrawImage(bitmap, destRect, srcRect, GraphicsUnit.Pixel); destBitmap.Save(context.Server.MapPath(path), ImageFormat.Jpeg); }