ASP.NET MVC: when posted Upload File, it is null in action method

Posted by Spencer on Stack Overflow See other posts from Stack Overflow or by Spencer
Published on 2009-02-13T00:16:40Z Indexed on 2010/06/05 6:52 UTC
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In the View page, code is below:

<% =Html.BeginForm("About", "Home", FormMethod.Post, new {enctype="multipart/form-data "})%>
<input type ="file"  name ="postedFile" />
<input type ="submit"  name ="upload" value ="Upload" />
<% Html.EndForm(); %>

In the Controller, something like this:

[AcceptVerbs(HttpVerbs.Post)]
public ActionResult  About(HttpPostedFile postedFile)
{
//but postedFile is null 
View();
}

But postedFile is null, how to do it?

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