blazor - Fluent Validation - Multiple messages for one rule - Stack Overflow

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Is there a way to return multiple messages on one rule?

public class EmployeeValidator : AbstractValidator<Employee>
{
    public EmployeeValidator ()
    {
      RuleFor(p => p.StartDate).Custom(ValidateStartDate);
    }
    
    private void ValidateStartDate(DateTime? startDate, ValidationContext<Employee>   context)
    {
    var gap = context.InstanceToValidate;
    
    if(startDate != null && startDate > DateTime.Noew.Date)
    {
         context.AddFailure(new ValidationFailure(nameof(gap.StartDate), "Start Date mustn't be in future."); // Message 1
    }

    if(condition)
    {
         context.AddFailure(new ValidationFailure(nameof(gap.StartDate), "Employee must be registered on this date."); // Message 2
    }
}
}

In the Blazor app:

   <MudDatePicker Label="Start Date" @bind-Date="employee.StartDate" Mask="@(new DateMask("MM/dd/yyyy"))"
                  DateFormat="MM/dd/yyyy"  ShowToolbar="false"
                  Variant="Variant.Outlined" Margin="Margin.Dense" Editable="true" For="() => employee.StartDate"></MudDatePicker>

This is always displaying message 2. Is it possible to display both the messages at once?

Is there a way to return multiple messages on one rule?

public class EmployeeValidator : AbstractValidator<Employee>
{
    public EmployeeValidator ()
    {
      RuleFor(p => p.StartDate).Custom(ValidateStartDate);
    }
    
    private void ValidateStartDate(DateTime? startDate, ValidationContext<Employee>   context)
    {
    var gap = context.InstanceToValidate;
    
    if(startDate != null && startDate > DateTime.Noew.Date)
    {
         context.AddFailure(new ValidationFailure(nameof(gap.StartDate), "Start Date mustn't be in future."); // Message 1
    }

    if(condition)
    {
         context.AddFailure(new ValidationFailure(nameof(gap.StartDate), "Employee must be registered on this date."); // Message 2
    }
}
}

In the Blazor app:

   <MudDatePicker Label="Start Date" @bind-Date="employee.StartDate" Mask="@(new DateMask("MM/dd/yyyy"))"
                  DateFormat="MM/dd/yyyy"  ShowToolbar="false"
                  Variant="Variant.Outlined" Margin="Margin.Dense" Editable="true" For="() => employee.StartDate"></MudDatePicker>

This is always displaying message 2. Is it possible to display both the messages at once?

• blazor
• blazor-server-side
• fluentvalidation

Share Improve this question Follow edited Feb 25 at 0:38 blue pink asked Feb 24 at 23:11 blue pinkblue pink 2111 bronze badge 8

• AFAIK from MudInputControl, it will only display 1 message – Yong Shun Commented Feb 25 at 3:23
• are you using the FluentValidation or Blazored.FluentValidation package? – Jalpa Panchal Commented Feb 25 at 10:44
• Blazored.FluentValidation – blue pink Commented Feb 25 at 13:30
• could you try this: var errorlist = new List<string>(); if (startDate != null && startDate > DateTime.Now.Date) { errorlist.Add("Start Date mustn't be in future."); } if (condition) { errorlist.Add("Employee must be registered on this date."); } if (errorlist.Count > 0) { var errormessage = string.Join("<br/>", errorlist); context.AddFailure(new ValidationFailure(nameof(gap.StartDate), errormessage)); } – Jalpa Panchal Commented Feb 26 at 10:56
• I already tried but it's displaying <br/> as is. – blue pink Commented Feb 26 at 20:12

 |  Show 3 more comments

1 Answer 1

Sorted by: Reset to default 0

You could try this below code:

let's say I have two condition first will check the null date and second will check the grater than today's day

using FluentValidation;

namespace BlazorApp2
{
    public class EmployeeValidator : AbstractValidator<Employee>

    {
        public EmployeeValidator()
        {
            RuleFor(p => p.StartDate).Custom(ValidateStartDate);
        }
        private void ValidateStartDate(DateTime? startDate, ValidationContext<Employee> context)
        {
            var employee = context.InstanceToValidate;

            // First Validation: Start Date mustn't be in future.
            if (startDate != null)
            {
                context.AddFailure(nameof(employee.StartDate), "Start Date mustn't be in future.");
                
            }

            // Second Validation: Employee must be registered on this date.
            if (startDate > DateTime.Now.Date)
            {
                context.AddFailure(nameof(employee.StartDate), "Employee must be registered on this date.");
            }
        }

    }
}

OR

One condition will check future date selection and second will show past selection:

// First Validation: Start Date mustn't be in future.
 if (startDate != null && startDate > DateTime.Now.Date)
 {
     context.AddFailure(nameof(employee.StartDate), "Start Date mustn't be in future.");
 }
 // Second Validation: Employee must be registered on this date.
 if (startDate != null && startDate < DateTime.Now.AddYears(-1).Date)
 {
     context.AddFailure(nameof(employee.StartDate), "Employee must be registered on this date.");
 }

razor page:

@page "/"
@using FluentValidation
@using MudBlazor
@inject IValidator<Employee> EmployeeValidator

<EditForm Model="@employee" OnValidSubmit="HandleValidSubmit">
    <DataAnnotationsValidator />
    <ValidationSummary />
    <MudForm @ref="form" Model="@employee">
        <MudTextField Label="Name" @bind-Value="employee.Name" />
        <MudDatePicker Label="Start Date" @bind-Date="employee.StartDate" Mask="@(new DateMask("MM/dd/yyyy"))"
                       DateFormat="MM/dd/yyyy" ShowToolbar="false"
                       Variant="Variant.Outlined" Margin="Margin.Dense" Editable="true">
        </MudDatePicker>
        <MudButton OnClick="ValidateForm" Variant="Variant.Filled" Color="Color.Primary">Submit</MudButton>
    </MudForm>
</EditForm>

@code {
    private Employee employee = new Employee();
    private MudForm form;

    private async Task ValidateForm()
    {
        var result = await EmployeeValidator.ValidateAsync(employee);
        if (result.IsValid)
        {
            Console.WriteLine("Form Submitted Successfully!");
        }
        else
        {
            // Log all validation errors
            foreach (var failure in result.Errors)
            {
                Console.WriteLine(failure.ErrorMessage);
            }
        }
    }

    private void HandleValidSubmit()
    {
        // Handle submission logic after the form is valid
        Console.WriteLine("Form submitted successfully.");
    }
}

Let me know if you have any concern regarding the provided information or my understanding is different

本文标签： blazorFluent ValidationMultiple messages for one ruleStack Overflow