Clear One of Fields Value By ModelState In Asp.Net Core?

Question

I just want one field value to be empty

ModelState.Clear Clear all fields

Model :

 public class UserViewModel{
      [Required("")]
      public string Mobile { get; set; }
      [Required("")]
      public string Name { get; set; }
     }

Controller :

public IActionResult Create(UserViewModel viewModel){
   if (!ModelState.IsValid)
    {
      //clear just field "Name"
 
      return view(viewModel);
    }

  }

I want only the "Name" field to be cleaned when I return ?

https://stackoverflow.com/questions/7424003/mvc3-remove-modelstate-errors — Steve Greene, Aug 15 '21 at 15:25

Serge · Answer 1 · 2021-08-15T17:12:41.177

1

try this

 if (ModelState.ContainsKey("Name")) ModelState.Remove("Name");

and better to use it this way

if (ModelState.ContainsKey("Name")) ModelState.Remove("Name");

if (!ModelState.IsValid)
    {
       return view(viewModel);
    }

if you want just clear the value

ModelState.SetModelValue("Name", new ValueProviderResult(string.Empty, CultureInfo.InvariantCulture));

since you don't clear errors and if it has errors, ModelState still will not be valid.

You can remove errors if you need

 ModelState["Name"].Errors.Clear();

edited Aug 15 '21 at 17:12

answered Aug 15 '21 at 16:15

Serge

40,935
4
18
45

@sunboy_sunboy What do you need remove name for? – Serge Aug 15 '21 at 16:48
Clear Field Value – sunboy_sunboy Aug 15 '21 at 16:53

score 1 · Answer 2 · answered Aug 15 '21 at 16:58

1

You can use ModelState.Remove("FieldName");

answered Aug 15 '21 at 16:58

Eanthmue

471
2
5

score -1 · Accepted Answer · answered Aug 16 '21 at 06:47

-1

I used ViewBag, it worked better

public IActionResult Create(UserViewModel viewModel){
  if (!ModelState.IsValid)
   {
       ViewBag.value = ""; 
       return view(viewModel);
   }

}

Html :

<input id="answer" value="@ViewBag.value" asp-for="Name"/>

answered Aug 16 '21 at 06:47

sunboy_sunboy

225
2
14

2

Kind of defeats the purpose of a viewmodel and data binding. – Steve Greene Aug 17 '21 at 01:26

Clear One of Fields Value By ModelState In Asp.Net Core?

3 Answers3