asp.net-mvc - 无法将 HttpFileCollectionBase 转换为 HttpFileCollection

Question

我有一个片面的看法:

<% using (Html.BeginForm("add", "home", FormMethod.Post, 
   new { enctype = "multipart/form-data" })){%>
   <input name="IncomingFiles" type="file" />
   <div class="editor-field"><%: Html.TextBox("TagsInput") %></div>
   <p><input type="submit" value="Create" /></p><% } %>

在 Controller 中:

    [HttpPost]
    public ActionResult add(HttpFileCollection IncomingFiles, string TagsInput)
    {
         return View();
    }

它根本不会将我上传的文件与 HttpFileCollection 相匹配，它们会以 HttpFileCollectionBase 的形式出现。我怎样才能让 View 向我传递 HttpFileCollection？

我需要任何特定的 BeginForm 参数吗？

谢谢!

Answer 1

在你的行动方面做这样的事情。您不将文件作为参数传递:

[HttpPost]
public ActionResult add(string TagsInput) {
  if (Request.Files.Count > 0) {
    // for this example; processing just the first file
         HttpPostedFileBase file = Request.Files[0];
 if (file.ContentLength == 0) {
      // throw an error here if content length is not > 0
      // you'll probably want to do something with file.ContentType and file.FileName
      byte[] fileContent = new byte[file.ContentLength];
      file.InputStream.Read(fileContent, 0, file.ContentLength);
      // fileContent now contains the byte[] of your attachment...
    }  
  }
  return View();
}