c# - File input sending null to controller

Question

This question already has answers here: question from:https://stackoverflow.com/questions/65853256/file-input-sending-null-to-controller

Answer 1

You should add enctype as multipart/form-data

@using (Html.BeginForm(nameof(ServiceCallController.AddMessage), "ServiceCall", FormMethod.Post, new { enctype = "multipart/form-data" }))

And the action method:

[HttpPost]
public ActionResult AddMessage(int id, string newMessage, HttpPostedFileBase myFile)
{
    if (myFile == null) throw new ArgumentNullException(nameof(myFile));//This should not happen
    return RedirectToAction(nameof(MyView), new { id });
}