Forms collection does not contain input file (ASP.Net MVC 3)

Question

@using (Html.BeginForm("Edit", "MyController", FormMethod.Post, new { enctype="multipart/form-data"}))
{
@Html.EditorFor(model => model.Name)
<input type="file" name="fileUpload" id="fileUpload" />
<input type="image" name="imb_save" src="/button_save.gif" alt="" value="Save" />
}

Submitted form and model are passed in this action:

[HttpPost]
public ActionResult Edit(MyModel mymodel, FormCollection forms)
{
         if (string.IsNullOrEmpty(forms["fileUpload"]))
         {
                  //forms["fileUpload"] does not exist
         }
         //TODO: something...
}

Why does not forms contain fileUpload? But it contains other inputs. How can I get content of my uploader? Thanks.

Darin Dimitrov · Accepted Answer · 2011-05-12 07:08:51Z

4

Take a look at the following blog post for handling file uploads in ASP.NET MVC. You could use HttpPostedFileBase in your controller instead of FormCollection:

[HttpPost]
public ActionResult Edit(MyModel mymodel, HttpPostedFileBase fileUpload)
{
    if (fileUpload != null && fileUpload.ContentLength > 0) 
    {
        // The user uploaded a file => process it here
    }

    //TODO: something...
}

You could also make this fileUpload part of your view model:

public class MyModel
{
    public HttpPostedFileBase FileUpload { get; set; }

    ...
}

and then:

[HttpPost]
public ActionResult Edit(MyModel mymodel)
{
    if (mymodel.FileUpload != null && mymodel.FileUpload.ContentLength > 0) 
    {
        // The user uploaded a file => process it here
    }

    //TODO: something...
}

answered May 12, 2011 at 7:08

Darin Dimitrov

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5 Comments

greatromul Over a year ago

But why does such way work properly in this case?

Darin Dimitrov Over a year ago

@greatromul, in this example they use Request.Files["FileBlob"] to fetch the actual file, they are not fetching it from FormCollection. So in your code you could do var file = Request.Files["fileUpload"];. But anyway I would strongly recommend you using HttpPostedFileBase.

Darin Dimitrov Over a year ago

@greatromul, for which object? Try following the exact steps showed in the blog post. Then adapt to your scenario.

greatromul Over a year ago

I found reason, but can not resolve it. Index action works only, but i can't understand why.

greatromul Over a year ago

You are right, Request.Files["fileUpload"] works properly. But I follow your advice and will use trick with model. It is important to not forget, that input name must be the same as property in model. Thanks for help!

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