Prerequisites

• Download and install .Net Core 6.0 SDK from here
• Download and Install Microsoft Visual Studio 2022 from here

Create ASP.NET Core Web App

• Open visual studio and click the Create New Project Option
• Select the Blank Template

• Enter the name of the Project

Select framework and Click on Create

Install NuGet Packages

• Microsoft.AspNetCore.Identity.EntityFramework
• Microsoft.EntityFrameworkCore
• Microsoft.EntityFrameworkCore.InMemory

DbContext Class

DbContext Class. The DbContext is used for accessing application data through Entity Framework Core. You need to create DbContext class that derives from “IdentityDbContext” class

using Microsoft.AspNetCore.Identity.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore;

namespace Auth_Identity_Login.Services
{

    //Identity contains all user table to inherits
    public class AppDbContext : IdentityDbContext 
    {
        public AppDbContext(DbContextOptions<AppDbContext> option)
            :base(option)
        {

        }
    }
}

Create View Model

using System.ComponentModel.DataAnnotations;

namespace Auth_Identity_Login.Models
{
    public class UserViewModel
    {
        [Key]
        public int userid { get; set; }       
        public string username { get; set; }
        public string Email { get; set; }
        public string password { get; set; }    
    }
}

Program.cs

using Auth_Identity_Login.Services;
using Microsoft.AspNetCore.Identity;
using Microsoft.EntityFrameworkCore;

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.
builder.Services.AddControllersWithViews();


builder.Services.AddDbContext<AppDbContext>(config=>
    {
        config.UseInMemoryDatabase("Memory");

});

builder.Services.AddIdentity<IdentityUser, IdentityRole>(config=>
{
    config.Password.RequiredLength = 5;
    config.Password.RequireDigit = false;
    config.Password.RequireNonAlphanumeric = false;
    config.Password.RequireUppercase = false;

})
    .AddEntityFrameworkStores<AppDbContext>()
    .AddDefaultTokenProviders();

builder.Services.ConfigureApplicationCookie(config =>
{
    config.Cookie.Name = "Auth_Tutorial";
    config.LoginPath = "/Home/Login";

});

 
builder.Services.AddMvc();

var app = builder.Build();

// Configure the HTTP request pipeline.
if (!app.Environment.IsDevelopment())
{
    app.UseExceptionHandler("/Error");
    // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
    app.UseHsts();
}

app.UseHttpsRedirection();
app.UseStaticFiles();

app.UseAuthentication();

app.UseRouting();

app.UseAuthorization();

app.UseEndpoints(endpoint =>
{
    endpoint.MapDefaultControllerRoute();

});

app.Run();

Previous Article also you can check ASP.Net Core Authentication and Authorization Basics in .Net Core 6.0

Create Controller

Create the Home Controller

using Auth_Identity_Login.Models;
using Microsoft.AspNetCore.Authentication;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Identity;
using Microsoft.AspNetCore.Mvc;
using System.Security.Claims;

namespace Auth_Identity_Login.Controllers
{
    public class HomeController : Controller
    {
        private readonly UserManager<IdentityUser> _userManager;
        private readonly SignInManager<IdentityUser> _signInManager;

        public HomeController(UserManager<IdentityUser> userManager,SignInManager<IdentityUser> signInManager)
        {
            _userManager = userManager;   
            _signInManager = signInManager;
        }
        public IActionResult Index()
        {
            return View();
        }

         
        public IActionResult Register()
        {

            return View();
        }

        public IActionResult Login()
        {

            return View();
        }
        [HttpPost]
        public async Task<IActionResult> Login(UserViewModel model)
        {
            var user = await _userManager.FindByNameAsync(model.username);

            try
            {
                           
            if (user != null)
            {
              var SignInResult = await _signInManager.PasswordSignInAsync(user, model.password,false,false);
            
            if (SignInResult.Succeeded)
            {
                    TempData["Message"] = "Logged In";
                    return RedirectToAction(nameof(Index));
                }
            }
            }
            catch (Exception)
            {

                TempData["Message"] = "User doesn't Exist";
                return RedirectToAction(nameof(Index));
            }

            TempData["Message"] = "Login Fail";
            return RedirectToAction(nameof(Index));
        }

        [HttpPost]
        public async Task<IActionResult> Register(UserViewModel model)
        {
            var userinfo = new IdentityUser
            {

                UserName = model.username,
                Email = string.Empty,
            };
           var userresult = await  _userManager.CreateAsync(userinfo,model.password);

            if (userresult.Succeeded)
            {
                var SignInResult = await _signInManager.PasswordSignInAsync(userinfo, model.password, false, false);

                if (SignInResult.Succeeded)
                {
                    TempData["Message"] = "User Registered";
                    return RedirectToAction(nameof(Index));
                }
            }
            TempData["Message"] = "User Registeration Fail";
            return RedirectToAction(nameof(Index));
        }

            
        public async Task<IActionResult> LogOut()
        {
            await _signInManager.SignOutAsync();
            return RedirectToAction(nameof(Index));
        }
        
              
       
    }
}

Create View

Index.cshtml

@*
    For more information on enabling MVC for empty projects, visit https://go.microsoft.com/fwlink/?LinkID=397860
*@
@{
}
 
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@3.3.7/dist/css/bootstrap.min.css" />
<br/>
<div class="container-fluid">
<div class="btn-group">
         
    <a asp-controller="Home" asp-action="Register" class="btn-primary">Register</a>
    <br/>

    <a asp-controller="Home" asp-action="Login" class="btn-primary">Login</a>

        <h1>@TempData["Message"]</h1>
    </div>
</div>  

Login.cshtml

@*
    For more information on enabling MVC for empty projects, visit https://go.microsoft.com/fwlink/?LinkID=397860
*@
@{
}

 
<html>
<head>

    <link rel="stylesheet" href="~/css/Style.css" />
</head>

<body>
    <div class="login">
        <h1>Login</h1>

        <form method="post" enctype="multipart/form-data" asp-controller="Home" asp-action="Login">
            <p><input type="text" name="username" value="" placeholder="Username or Email" required></p>
            <p><input type="password" name="password" value="" placeholder="Password" required></p>
            <p class="remember_me">
                <label>
                    <input type="checkbox" name="remember_me" id="remember_me">
                    Remember me on this computer
                </label>
            </p>
            <p class="submit"><input type="submit" name="commit" value="Login"></p>
            <hr />
             
        </form>
    </div>
</body>
</html>

Register.cshtml

@*
    For more information on enabling MVC for empty projects, visit https://go.microsoft.com/fwlink/?LinkID=397860
*@
@{
}

@model Auth_Identity_Login.Models.UserViewModel

<html>
<head>

    <link rel="stylesheet" href="~/css/Style.css" />
</head>

<body>
    <div class="login">
        <h1>User Registeration</h1>

        <form method="post" enctype="multipart/form-data" asp-controller="Home" asp-action="Register">
            <p><input type="text" name="username" value="" placeholder="Username or Email" required></p>
            <p><input type="password" name="password" value="" placeholder="Password" required></p>
            <p class="remember_me">
                <label>
                    <input type="checkbox" name="remember_me" id="remember_me">
                    Remember me on this computer
                </label>
            </p>
            <p class="submit"><input type="submit" name="commit" value="Submit"></p>
            <hr />
            
        </form>
    </div>
</body>
</html>

The post How to Create Registration and Login using Identity in Asp.Net Core appeared first on Tech Insights.