Question

Let me try to explain my situation as simple as possible first:

Suppose I have a page which contains multiple [input type=’File’]. Some of them may be selected a file and some are not.

In my httppost method, I know I need to use parameter like “IEnumerable files” to get filenames, and also each [input] name I should define either = ‘files’ or ‘files[0]’,’files[1]’, etc…..

My question is: when getting a list of HttpPostedFileBase, how could I determine which file belongs to which input control？ As some inputs may leave blank.

Also because these [input] are created dynamically and there is no fixed number of it, I could not hard-code the parameter in httppost method for each of them.

Answer 1

Try this solution:

View:

@using (Html.BeginForm(null, null, FormMethod.Post, new { enctype = "multipart/form-data" }))
{
    <input type="file" name="file1" />
    <input type="file" name="file2"/>
    <input type="file" name="file3"/>
    <input type="file" name="file4"/>
    <input type="file" name="file5"/>

    <input type="submit" value="go" />
}

Controller:

  var uploaded = Request.Files.AllKeys
      .Select(x => new {file = Request.Files[x], name = x})
            .Where(x => x.file.ContentLength > 0).ToList();

The “uploaded” anonymouse type will contains file belonging to input control name, and will conatins only input names which selected