C# MVC 表单不将数据发送回 controller

Question

I know it must be something stupid, but I cant seem to figure this out. I have the following in a view:

 @using (@Html.BeginForm("ReceiveForm1", "Home", FormMethod.Post))
 {
     <div class="form-group">
         <label for="organizationID">Organization ID</label>
         <input type="number" class="form-control" asp-for="organizationID" aria-describedby="emailHelp" placeholder="Enter Organization ID">
     </div>
     <div class="form-group">
         <label for="externalPersonalID">External Personal ID</label>
         <input type="number" class="form-control" asp-for="externalPersonalID" placeholder="Enter External Personal ID">
     </div>
     <div class="form-group">
          <label for="phoneNumber">Phone Number</label>
          <input type="number" class="form-control" id="phoneNumber" asp-for="phoneNumber" placeholder="Password">
     </div>
     <button type="submit" class="btn btn-primary">Submit</button>
 }

And I have the following code in my controller:

    [HttpPost]
    public ActionResult ReceiveForm1(FormCollection collection)
    {
        IEnumerable<Form1Return> personData = GetPersonInformation(collection);
        return View(personData);
    }

When I run the code, and enter data into the form, and click the submit button, I run to a breakpoint set on call to GetPersonInformation. When I do a watch on collection, there are no elements. So for some reason, the form data is not making it to the controller. Any idea why?

Thanks.

Answer 1

The 'Microsoft.AspNetCore.Mvc.ModelBinding.Binders.FormCollectionModelBinder' cannot bind to a model of type 'Microsoft.AspNetCore.Http.FormCollection'. Change the model type to 'Microsoft.AspNetCore.Http.IFormCollection' instead.

Please try this:

    [HttpPost]
    public ActionResult ReceiveForm1(IFormCollection collection)
    {
        IEnumerable<Form1Return> personData = GetPersonInformation(collection);
        return View(personData);
    }

Answer 2

I've seen this happen when input 's don't have their name attribute set. The relevant section on W3Schools has this nugget which confirms this is likely the case.

Note: Only form elements with a name attribute will have their values passed when submitting a form.