How do you get post value in .NET Core

Question

I have a Customer controller that has these 2 action methods.

    [HttpGet]
    public IActionResult Create()
    {
        ViewBag.Title = "Customers";
        return View();
    }

    [HttpPost]
    public IActionResult Create(IFormCollection form)
    {
        return View();
    }

I also created a Customer view.

<form class="form-horizontal" method="post" action="/Customer/Create">
    <div class="form-group">
        <label class="col-lg-2 control-label">FirstName *</label>
        <div class="col-sm-6">
            <input type="text" class="form-control" required name="FirstName">
        </div>
    </div>
    <div class="form-group">
        <label class="col-lg-2 control-label">LastName *</label>
        <div class="col-sm-6">
            <input type="text" class="form-control" required name="LastName">
    </div>
</div>
</form>

How do I get the post values? Every time I submit the form it goes to the [HttpGet] and I want to use the [HttpPost]. I'm new to ASP.NET Core so sorry for the simple question.

Answer 1

Several ways:

• Add a FirstName and LastName (case insensitive) string parameter to the Create method that accepts a post
• Add a parameter of type IFormCollection to this same method and access the named values FirstName and LastName
• Directly access the values from HttpContext.Request.Form
• Access the values from the ModelState property
• Add a model parameter of a POCO class that holds whatever values you want to submit

Answer 2

Add 2 parameter to your http post action method which is matching with your form element names.

[HttpPost]
public IActionResult Create(string firstName,string lastName)
{
    return View();
}

Another option is to create view model class with properties matching to form element names. This is useful when you have many input elements in the form and do not want to add clutter to the parameter list of your action method.

public class LoginVm
{
  public string FirstName { set;get;}
  public string LastName { set;get;}
}

and

[HttpPost]
public IActionResult Create(LoginVm model)
{
    // to do : user model.FirstName and model.LastName
    return View();
}

When the form is submitted, the model binder will read the posted form data and map it to the view model object property values.

Remember, view model is specific to the view. So if your view(form) is sending 5 fields, create a simple POCO view model with only those 5 fields.