Create ASP.NET 5 Form Using Tag Helpers

This article will show you how to create a basic ASP.NET 5 (ASP.NET Core 1.X) Form using Tag Helpers. We will form HTML elements based on a C# model and use standard Razor syntax in the markup. There are various options available when creating an ASP.NET 5 page, including [and not limited to] using [plain old] HTML, (tagged-based) Razor syntax, and a combination of both.

Tag Helpers

ASP.NET 5 Tag Helpers allow developers to create forms using server-side code and not rely on HTML. The form configuration is driven from a C# object to reduce the code needed to develop forms.

Tag Helpers using elements like <input> and <label> to link C# objects and forms, as you will see in the following example.

Email

I have Tag Helpers example in the following example, which presents the user with a simple form that requires the user to provide their email address.

If required, the form details (Display name and validation is configured in the C# object (Input).

End Result

Before getting into the code, The screenshot below shows what we are going to achieve.

Code

The first piece of code I am going to share with you is the Razor view page.

In this code example, I’m creating the form on the Index page.

Index.cshtml

@page
@model IndexModel
@{
    ViewData["Title"] = "Home page";
}

<form method="post" asp-antiforgery="true">
    <div class="form-group ">
        <label asp-for="Input.Email"></label>
        <input class="form-control" asp-for="Input.Email">
        <span asp-validation-for="Input.Email"></span>
    </div>
    <button type="submit" class="btn btn-primary">Submit</button>

</form>

The next code belongs to the C# Code-Behind page (Index.cshtml.cs)

The following namespace is needed for Data Annotations [EmailAddress] System.ComponentModel.DataAnnotations

using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.RazorPages;
using Microsoft.Extensions.Logging;
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Threading.Tasks;



namespace taghelper.Pages
{
    public class IndexModel : PageModel
    {
        [BindProperty]
         public UserInputModel Input { get; set; }  = new UserInputModel();
        private readonly ILogger<IndexModel> _logger;
        public IndexModel(ILogger<IndexModel> logger)
        {
            _logger = logger;
        }

        public void OnGet()
        {
            
        }
        public class UserInputModel
        {
            [Required]
            [EmailAddress]
            [Display (Name = "Email Address") ]
            public string Email { get; set; } = "[email protected]";
                    
        }


    }
}

At this stage, all you need to do is save the files and run the code. If you need to add more fields, follow the formula.

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