validation is not showing for nested model

Question

I have the following Model:

public partial class EmployeeInfo

{

public int EmployeeInfoId { get; set; }

[Required]

[DisplayName("Last Name")]

public string LastName { get; set; } =null!;

public virtual ICollection<EmergencyInfo> EmergencyInfos { get; } = new List<EmergencyInfo>();

}

I have another Model class for EmergencyInfo

public partial class EmergencyInfo

{

public int EmergencyInfoId { get; set; }

public int EmployeeInfoId { get; set; }

[DisplayName("First Name")]

[Required]

public string? FirstName { get; set; } = null!;

public virtual EmployeeInfo? EmployeeInfo { get; set; }

}

Although the Firstname is required in EmergencyInfo Model. When I click the submit button, it does not show that Firstname is required . It does show that LastName is required because that field exists in the EmployeeInfo model. below is my razor page:

@model AckPackage.Models.EmployeeInfo

@{

ViewData["Title"] = "Create";

}

<div class="form-group row">

            <div class="col-sm-4">

                <label asp-for="LastName" class="control-label"></label>

                <input asp-for="LastName" class="form-control input-lg" />

                <span asp-validation-for="LastName" class="text-danger"></span>

            </div>

    <div class="col">

                            <label asp-for="@Model.EmergencyInfos.ToList()[i].FirstName" class="control-label"></label>

                            <input name="EmergencyInfos[@i].FirstName" value="@(string.IsNullOrEmpty(Model.EmergencyInfos.ToList()[0].FirstName)? "": @Model.EmergencyInfos.ToList()[0].FirstName)" class="form-control" />

                 

<span asp-validation-for="@Model.EmergencyInfos.ToList()[0].FirstName" class="text-danger"></span>

                    </div>

@section Scripts {

@{

    await Html.RenderPartialAsync("_ValidationScriptsPartial");

}

Lastname not filled always displays LastName is required, but Firstname from emergencyInfo always goes to HTTPPost without showing validation error message.

Answer 1

Hi @Anjali Agarwal

You can modify your code as below:

1. In the EmployeeInfo class, try to use List<T> instead of ICollection<T> to add the EmergencyInfos property.

       public class EmployeeInfo
       {
           public int EmployeeInfoId { get; set; }
           public string LastName { get; set; } = null!;
           public string EmailAddress { get; set; } = null!;
           public virtual List<EmergencyInfo> EmergencyInfos { get; set; } = new List<EmergencyInfo>();
       }

1. In the view page. use the following code to display the properties:

   <div class="form-group">
       @if (Model != null && Model.EmergencyInfos != null && Model.EmergencyInfos.ToList().Count > 0)
       {
           var count = Model.EmergencyInfos.Count;
           @for (var i = 0; i < count; i++)
           {
               <div class="form-group row">
                   <div class="col">
                       <label class="control-label">LastName</label>
                       <input asp-for="EmergencyInfos[i].LastName" value="@(string.IsNullOrEmpty(Model.EmergencyInfos.ToList()[i].LastName)? "": @Model.EmergencyInfos.ToList()[i].LastName)" class="form-control" />
                       <span asp-validation-for="EmergencyInfos[i].LastName" class="text-danger"></span>
                   </div>
               </div> 
           }
       }
       else
       {
           <div class="form-group row">
               <div class="col">
                   <label asp-for="EmergencyInfos[0].LastName" class="control-label">LastName</label>
                   <input asp-for="EmergencyInfos[0].LastName" class="form-control" />
                   <span asp-validation-for="EmergencyInfos[0].LastName" class="text-danger"></span>
               </div> 
           </div>
       }
   </div>

The result as below:

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