上传图片

public ActionResult FileUpload()
        {
            HttpPostedFileBase file=Request.Files["fileIconUp"];    
            if (file != null)
            {
                string fileName = Path.GetFileName(file.FileName);//获取上传的文件名
                string fileExt = Path.GetExtension(fileName);//获取扩展名
                if (fileExt == ".jpg")
                {
                    string dir = "/MenuIcon/"+DateTime.Now.Year+"/"+DateTime.Now.Month+"/"+DateTime.Now.Day+"/";
                    Directory.CreateDirectory(Path.GetDirectoryName(Request.MapPath(dir)));
                    string filenewName = Guid.NewGuid().ToString();
                    string fullDir = dir + filenewName + fileExt;
                    file.SaveAs(Request.MapPath(fullDir));
                    return Content("yes:"+fullDir);
                }
                else
                {
                    return Content("no:文件类型错误!!");
                }
            }
            else
            {
                return Content("no:请选择上传的图片文件");
            }
        }