How can a formcollection be enumerated in ASP.NET MVC?

Question

How can I enumerate through all the key/values of a FormCollection (system.web.mvc) in ASP.NET MVC?

Answer 1

foreach(var key in Request.Form.AllKeys)
{
   var value = Request.Form[key];
}

Answer 2

Here are 3 ways to do it specifically with a FormCollection object.

public ActionResult SomeActionMethod(FormCollection formCollection)
{
  foreach (var key in formCollection.AllKeys)
  {
    var value = formCollection[key];
  }

  foreach (var key in formCollection.Keys)
  {
    var value = formCollection[key.ToString()];
  }

  // Using the ValueProvider
  var valueProvider = formCollection.ToValueProvider();
  foreach (var key in valueProvider.Keys)
  {
    var value = valueProvider[key];
  }
}

Answer 3

foreach(KeyValuePair<string, ValueProviderResult> kvp in form.ToValueProvider())
{
    string htmlControlName = kvp.Key;
    string htmlControlValue = kvp.Value.AttemptedValue;
}

Answer 4

And in VB.Net:

    Dim fv As KeyValuePair(Of String, ValueProviderResult)
    For Each fv In formValues.ToValueProvider
        Response.Write(fv.Key + ": " + fv.Value.AttemptedValue)
    Next