[Required(AllowEmptyStrings = true)] not working

Question

[Required(AllowEmptyStrings = true)] not working

Dondon510 261

I have a not required field, but why it keeps validated?, I have tried to remove the 'readonly' attribute but still keeps validated, what I missed?

    [Required(AllowEmptyStrings = true)]  
    public string parentOrganizationName { get; set; } = "";  
 

   <div class="row">  
              <div class="col-6 mb-1">  
                   <label class="form-label" for="parentOrganizationName">Parent Organization</label>  
                        <span data-bs-toggle="tooltip" data-bs-placement="top" title="Parent organization is your root organization, this readonly field value was defined by the vendor.">  
                        <i data-feather="info"></i>  
                                            </span>  
                                            <input type="text" class="form-control" id="parentOrganizationName" asp-for="parentOrganizationName" value="@Model.parentOrganizationName"  />  
                                        </div>  
                                    </div>

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Answer 1

Bruce (SqlWork.com) 84,086

I don't believe the asp/net require logic supports AllowEmptyStrings]

as [Required] just means not null or empty, why include if empty allowed? in form post, the value would never be null. the binder would find and set the value (which is always a string value) or it not included in the form data and your default value would be used.

Dondon510 261 Reputation points

2022-08-17T17:59:27.447+00:00

Hi @Bruce (SqlWork.com)

Thank you for your reply, the field is optional or might be readonly for some condition and I allow user to skip the field. I found “AllowEmptyStrings” from https://learn.microsoft.com/en-us/dotnet/api/system.componentmodel.dataannotations.requiredattribute.allowemptystrings?view=net-6.0

AgaveJoe 31,361

The remarks talks about saving data in a database not user input validation.

For user input just remove the [Required] attribute as suggested. If the default value should be an empty string then assign an empty string. For .NET 6 make sure to use a nullable type.

@page  
@model RazorPagesBasicDemo.Pages.ValidationExModel  
  
<div>  
    <form method="post">  
        <div>  
            <input type="text" class="form-control" id="parentOrganizationName" asp-for="parentOrganizationName" />  
            <span asp-validation-for="parentOrganizationName" class="text-danger"></span>  
  
        </div>  
      <div>  
          <input type="submit" value="submit" />  
      </div>  
    </form>  
      
</div>

Code

using Microsoft.AspNetCore.Mvc;  
using Microsoft.AspNetCore.Mvc.RazorPages;  
  
namespace RazorPagesBasicDemo.Pages  
{  
    public class ValidationExModel : PageModel  
    {  
        [BindProperty]  
        public string? parentOrganizationName { get; set; } = String.Empty;  
  
        public void OnGet()  
        {  
        }  
  
        public IActionResult OnPost()  
        {  
            if(!ModelState.IsValid)  
            {  
                return Page();  
            }  
  
            return Page();  
        }  
    }  
}

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[Required(AllowEmptyStrings = true)] not working

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