文件上传MVC 4 C＃后重定向回消息

Question

我正在开发MVC 4应用程序，并希望重定向回带有消息以调用操作视图：

1. 调用的操作：上传
2. 当前视图：索引

 public class HospitalController: Controller { public ActionResult Index() { return View(Model); } [HttpPost] public ActionResult Index(Model model) { return View(ohosDetailFinal); } [HttpPost] [ValidateAntiForgeryToken] public ActionResult Upload(HttpPostedFileBase upload,FormCollection form) { //Here i want to pass messge after file upload and redirect to index view with message // return View(); not working } } 

 @using (Html.BeginForm("Upload", "Hospital", null, FormMethod.Post, new { enctype = "multipart/form-data", @class = "" })) { @Html.AntiForgeryToken() @Html.ValidationSummary() <input type="file" id="dataFile" name="upload" class="hidden" /> } 

谢谢 ！

Answer 1

遵循PRG模式。 成功处理后，将用户重定向到另一个GET操作。

您可以使用RedirectToAction方法返回RedirectToAction 。 这将向浏览器返回304响应，并在位置标头中添加新的url，浏览器将对该URL发出新的GET请求。

[HttpPost]
public ActionResult Upload(HttpPostedFileBase upload,FormCollection form)
{
   //to do : Upload
   return RedirectToAction("Index","Hospital",new { msg="success"});
}

现在，在“索引”操作中，您可以添加此新参数msg并检查其值并显示适当的消息。 重定向请求将具有带有键msg的查询字符串（例如： /Hospital/Index?msg=success ）

public ActionResult Index(string msg="")
{
   //to do : check value of msg and show message to user
   ViewBag.Msg = msg=="success"?"Uploaded successfully":"";
   return View();
}

并认为

<p>@ViewBag.Msg</p>

如果您不喜欢url中的querystring，则可以考虑使用TempData 。 但是tempdata仅可用于下一个请求。

Answer 2

    [HttpPost]
    [ValidateAntiForgeryToken]
    public ActionResult Upload(HttpPostedFileBase upload,FormCollection form)
    {
        //Here i want to pass messge after file upload and redirect to index view with message
         return Index();//or with model index
    }

Answer 3

尝试下面的代码，希望对您有所帮助。

视图

    @using (Html.BeginForm("Upload", "Hospital", null, FormMethod.Post, new { enctype = "multipart/form-data", @class = "" }))
      {

       if (TempData["Info"] != null)
        {
       @Html.Raw(TempData["Info"])
        }


      @Html.AntiForgeryToken()
      @Html.ValidationSummary()
      <input type="file" id="dataFile" name="upload" class="hidden" />
      }

控制者

     [HttpPost]
     [ValidateAntiForgeryToken]
     public ActionResult Upload(HttpPostedFileBase upload,FormCollection form)
      {
        //Here i want to pass messge after file upload and redirect to index view with message
        TempData["Info"]="File Uploaded Successfully!";
        return RedirectToAction("Index");
      }