why post method doesn't refresh the page in the action method?-CodePudding

I know the post action method below is anti-pattern, but still I assume to see a new page with Name being set to null. But when I click the submit button, the page is not reloaded and I still see the old name displayed, is this a browser thing or asp.net core framework thing?

public class HomeController : Controller
{
   private IRepository repository;
   public HomeController(IRepository repo)
   {
      repository = repo;
   }

   // ...

   public IActionResult Create()  // create a Employer that has a name in the browser
   {
      return View();
   }

   [HttpPost]
   public IActionResult Create(Employee model)
   {
      model.Name = "";   // <----------------set it to null so I expect to see the Name being empty in the reponse
      return View(model);  
   }
}

// view file, Create.cshtml:

@model Employee
@{
    ViewData["Title"] = "Create Employee";
}

<h2>Create Employee</h2>

<form asp-action="Create" method="post">
    <div >
        <label asp-for="Id"></label>
        <input asp-for="Id"  />
    </div>
    <div >
        <label asp-for="Name"></label>
        <input asp-for="Name"  />
    </div>
    <div >
        <label asp-for="DOB"></label>
        <input asp-for="DOB"  />
    </div>
    <div >
        <label asp-for="Role"></label>
        <select asp-for="Role"  asp-items="@new SelectList(Enum.GetNames(typeof(Role)))"></select>
    </div>
    <button type="submit" >Submit</button>
</form>

Firstly, a get method to invoke the Create() action method and fill some data:

After clicking submit button, the page still shows the original name where I exepct to see a empty name since I modify it in the post action method

so why the name still exists after the second request?

CodePudding user response：

So why the name still exists after the second request?

Well, altough, you have rebind your model property value. However, your current model state still remain unchanged. Therefore, you are getting the older value even after the form resubmission. To overcome this issue, please try following code snippet:

Solution:

You have clear your current model state by using

ModelState.Clear(); wwill resolve your issue completely.

CodePudding user response：

It can reset the data to which you have responded. So basically to send data without any loss