public ActionResult ImagePreview() { RequestUtil req = new RequestUtil(); string callback = req.String("callback"); int width = req.Int("width", defaultValue: 640); int height = req.Int("height", defaultValue: 1024); HttpPostedFileBase pic = Request.Files.Count == 0 ? null : Request.Files[0]; if (pic != null && pic.ContentLength != 0) { byte[] imageBuffer = ImageUtil.Compress(pic.InputStream, 40, width, height); string guid = System.Guid.NewGuid().ToString("N"); CacheUtil.CreateCache("preview-" + guid, 0.1, imageBuffer); return(Content(HtmlUtil.Result(callback, new { success = true, guid = guid, name = Request.Files.Keys[0] }))); } else { return(Content(HtmlUtil.Result(callback, new { success = false, msg = "您还未选择图片" }))); } }