MVC Model validation on “HttpPostedFileWrapper”

Question

Can someone help me with model validation on a HttpPostedFileWrapper object?

Model:

[Required(AllowEmptyStrings = false)]
public HttpPostedFileWrapper BlahFile { get; set; }

Controller:

   [HttpPost]
    public ActionResult LoadBlahData(BlahModel blahModel) 
    {
        if (!ModelState.IsValid)
            return RedirectToAction("Index");
    }

cshtml:

@using (Html.BeginForm("LoadBlahData", "Admin", FormMethod.Post, new { @class = "blahhForm", enctype = "multipart/form-data", id = "uploadBlah" }))
{
    <fieldset>
        <legend>Upload Blah Information</legend>
        @Html.LabelFor(x=>x.BlahFile, "Upload Blah file:")
        <input size="26" class="uploader" type="file" name="BlahFile" />
        <p><input class="ttButton" type="submit" value="Load Stuff" /></p>
    </fieldset>
}

Problem:

1. Cannot see the "data-val*" attributes being added to the html.
2. Does not set the unobtrusive validation off (red border on input box)

Notes:

1. Other items in the Model are working fine with validation, its only the <input type="file"/> that seems to be having problems.
2. Comes into the action method fine - (i.e - i can access the InputStream if i want).
3. All scripts are referenced correctly (its working on normal text input's)

Thanks in advance,

Answer 1

Just for anyone else coming across this question you can also do this -

<%: Html.TextBoxFor(x => x.BlahFile, new { type = "file" }) %>

Answer 2

you have not added any data attributes to your element. Add it like,

<input data-pk="1" size="26" class="uploader" type="file" name="BlahFile" />

and there is no support of validation of <input type="file"