Fileupload仅适用于索引操作（ASP.Net MVC） [英] Fileupload works in Index action only (ASP.Net MVC)

问题描述

我有两个简单的控制器动作：

$ public $ TestController $ Controller

/ //测试
public ActionResult Index（）
{
return View（）;

[HttpPost]
public ActionResult Index（HttpPostedFileBase file）
{
bool b = file == null; //会出现false
return RedirectToAction（Index）;

$ b // //测试/奇迹
[HttpGet]
public ActionResult Wonder（）
{
return View（）;

[HttpPost]
public ActionResult Wonder（HttpPostedFile文件）
{
bool b = file == null; //会有真的！
返回RedirectToAction（Wonder）;




$ b我有类似的看法，
索引操作：

 < h2>索引< / h2> 
< form action =method =postenctype =multipart / form-data> 
< input type =filename =fileid =file/> 
< input type =submit/> 
< / form> 
  

奇迹行动：

 < h2>奇妙！< / h2> 
< form action =method =postenctype =multipart / form-data> 
< input type =filename =fileid =file/> 
< input type =submit/> 
< / form>为什么第一个窗体（Index）将正确的文件提交给控制器，而第二个窗体（Wonder）则提交了空的窗体（$）？你的索引ActionResult收到一个HttpPostedFileBase对象的参数，而Wonder ActionResult收到一个HttpPostedFile对象作为参数。  
I have simple controller with two actions:
public class TestController : Controller
{
      // /Test
      public ActionResult Index()
      {
          return View();
      }
      [HttpPost]
      public ActionResult Index(HttpPostedFileBase file)
      {    
          bool b = file == null; //there will be false
          return RedirectToAction("Index");
      }

      // /Test/Wonder
      [HttpGet]
      public ActionResult Wonder()
      {
          return View();
      }        
      [HttpPost]
      public ActionResult Wonder(HttpPostedFile file)
      {
          bool b = file == null; //there will be TRUE!
          return RedirectToAction("Wonder");
      }
}
I have similar views for my actions.
Index action:
<h2>Index</h2>
<form action="" method="post" enctype="multipart/form-data">  
  <input type="file" name="file" id="file" />
  <input type="submit" />
</form>
Wonder action:
<h2>It's wonder!</h2>
<form action="" method="post" enctype="multipart/form-data">  
  <input type="file" name="file" id="file" />
  <input type="submit" />
</form>
Why does first form (Index) submit correct file to controller, but second form (Wonder) submits null to controller?
解决方案
Your Index ActionResult receives as a parameter a HttpPostedFileBase object whereas the Wonder ActionResult receives as a parameter a HttpPostedFile object.

                        
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