.Net MVC 图片上传

 1 public ActionResult Upload() 2 ????????{ 3 ????????????string imgurl = ""; 4 ????????????foreach (string key in Request.Files) 5 ????????????{ 6 ????????????????//这里只测试上传第一张图片file[0] 7 ????????????????HttpPostedFileBase file0 = Request.Files[key]; 8 ?9 ????????????????//转换成byte,读取图片MIME类型10 ????????????????Stream stream;11 ????????????????int size = file0.ContentLength / 1024; //文件大小KB12 13 ????????????????if (size > 1024)14 ????????????????{15 ????????????????????return Content(ReturnMsg(Enum_Return.失败, "图片不能超过1M：", null));16 ????????????????}17 18 ????????????????byte[] fileByte = new byte[2];//contentLength，这里我们只读取文件长度的前两位用于判断就好了，这样速度比较快，剩下的也用不到。19 ????????????????stream = file0.InputStream;20 ????????????????stream.Read(fileByte, 0, 2);//contentLength，还是取前两位21 22 ????????????????//获取图片宽和高23 ????????????????//System.Drawing.Image image = System.Drawing.Image.FromStream(stream);24 ????????????????//int width = image.Width;25 ????????????????//int height = image.Height;26 27 28 ????????????????string fileFlag = "";29 ????????????????if (fileByte != null && fileByte.Length > 0)//图片数据是否为空30 ????????????????{31 ????????????????????fileFlag = fileByte[0].ToString() ??fileByte[1].ToString();32 ????????????????}33 ????????????????string[] fileTypeStr = { "255216", "7173", "6677", "13780" };//对应的图片格式jpg,gif,bmp,png34 ????????????????if (fileTypeStr.Contains(fileFlag))35 ????????????????{36 ????????????????????string action = Request["action"];37 ????????????????????string path = "/uploads/";38 ????????????????????switch (action)39 ????????????????????{40 ????????????????????????case "headimage":41 ????????????????????????????path ???= "headimage/";42 ????????????????????????????break;43 ????????????????????????case "blogtype":44 ????????????????????????????path ???= "blogtype/";45 ????????????????????????????break;46 ????????????????????}47 ????????????????????string fullpath = path ???UserInfo.userID ???"/";48 ????????????????????if (!Directory.Exists(Server.MapPath(fullpath)))49 ????????????????????{50 ????????????????????????Directory.CreateDirectory(Server.MapPath(fullpath));51 ????????????????????}52 53 54 ????????????????????Request.Files[key].SaveAs(Server.MapPath(fullpath ??Request.Files[key].FileName));55 ????????????????????imgurl = fullpath ???Request.Files[key].FileName;56 ????????????????}57 ????????????????else58 ????????????????{59 ????????????????????return Content(ReturnMsg(Enum_Return.失败, "图片格式不正确：" ?fileFlag, null));60 ????????????????}61 62 ????????????????stream.Close();63 ????????????}64 65 ????????????return Content(ReturnMsg(Enum_Return.成功, "上传成功", imgurl));66 ????????}

public void ProcessRequest(HttpContext context) ???{ ???????context.Response.ContentType = "application/json"; ???????HttpPostedFile _upfile = context.Request.Files["File"]; ???????if (_upfile.ContentLength < 500000) ???????{ ???????????if (string.IsNullOrEmpty(_upfile.FileName)) ???????????{ ????????????????context.Response.Write("请上传图片"); ???????????} ???????????string fileFullname = _upfile.FileName; ???????????string dataName = DateTime.Now.ToString("yyyyMMddhhmmss"); ???????????string fileName = fileFullname.Substring(fileFullname.LastIndexOf("\\") ???1); ???????????string type = fileFullname.Substring(fileFullname.LastIndexOf(".") ???1); ???????????if (type == "bmp" || type == "jpg" || type == "gif" || type == "JPG" || type == "BMP" || type == "GIF") ???????????{ ???????????????_upfile.SaveAs(HttpContext.Current.Server.MapPath("photo") ??"\\" ???dataName ???"." ???type); ???????????????HttpCookie cookie = new HttpCookie("photo"); ???????????????context.Response.Write("上传成功"); ???????????} ???????????else ???????????{ ???????????????context.Response.Write("支持格式：|jpg|gif|bmp|"); ???????????} ???????} ???????else ???????{ ???????????context.Response.Write("你的图片已经超过500K的大小！"); ???????} ???}