using DemoIdentityAuthentication.Models;
using Microsoft.AspNetCore.Identity.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore;  namespace DemoIdentityAuthentication.Data
{  // IdentityDbContext contains all the user tables  public class ApplicationDbContext : IdentityDbContext<AppUser>  {  public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options)  : base(options)  {  }  }
}

第2步

using Microsoft.AspNetCore.Identity;  namespace DemoIdentityAuthentication.Models
{  public class AppUser : IdentityUser  {  public string Name { get; set; }  public string DateOfBirth { get; set; }  public string Password { get; set; }  }
}

第3步

using DemoIdentityAuthentication.Data;
using DemoIdentityAuthentication.Models;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Identity;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using System;  namespace DemoIdentityAuthentication
{  public class Startup  {  public Startup(IConfiguration configuration)  {  Configuration = configuration;  }  public IConfiguration Configuration { get; }  public void ConfigureServices(IServiceCollection services)  {  services.AddDbContext<ApplicationDbContext>(config =>  {  // for in memory database  config.UseInMemoryDatabase("MemoryBaseDataBase");  });  // AddIdentity :-  Registers the services  services.AddIdentity<AppUser, IdentityRole>(config =>  {  // User defined password policy settings.  config.Password.RequiredLength = 4;  config.Password.RequireDigit = false;  config.Password.RequireNonAlphanumeric = false;  config.Password.RequireUppercase = false;  })  .AddEntityFrameworkStores<ApplicationDbContext>()  .AddDefaultTokenProviders();  // Cookie settings   services.ConfigureApplicationCookie(config =>  {  config.Cookie.Name = "DemoProjectCookie";  config.LoginPath = "/Home/Login"; // User defined login path  config.ExpireTimeSpan = TimeSpan.FromMinutes(5);  });   services.AddControllersWithViews();  }  // This method gets called by the runtime. // Use this method to configure the HTTP request pipeline.  public void Configure(IApplicationBuilder app, IWebHostEnvironment env)  {  if (env.IsDevelopment())  {  app.UseDeveloperExceptionPage();  }  else  {  app.UseExceptionHandler("/Home/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.UseRouting();  app.UseAuthentication();  app.UseAuthorization();  app.UseEndpoints(endpoints =>  {  endpoints.MapControllerRoute(  name: "default",  pattern: "{controller=Home}/{action=Index}/{id?}");  });  }  }
}

第4步

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Logging;
using DemoIdentityAuthentication.Models;
using Microsoft.AspNetCore.Identity;
using Microsoft.AspNetCore.Authorization;  namespace DemoIdentityAuthentication.Controllers
{  public class HomeController : Controller  {  private readonly UserManager<AppUser> _userManager;  private readonly SignInManager<AppUser> _signInManager;  public HomeController(  UserManager<AppUser> userManager,  SignInManager<AppUser> signInManager)  {  _userManager = userManager;  _signInManager = signInManager;  }  public IActionResult Index()  {  return View();  }    [Authorize]  public async Task<IActionResult> UserInfo()  {  var user = await _userManager.GetUserAsync(HttpContext.User).ConfigureAwait(false);            if (user == null)  {  RedirectToAction("Login");  }  //login functionality  return View(user);  }  [HttpGet]  public IActionResult Login()  {  return View();  }  [HttpPost]  public async Task<IActionResult> Login(AppUser appUser)  {  //login functionality  var user = await _userManager.FindByNameAsync(appUser.UserName);  if (user != null)  {  //sign in  var signInResult = await _signInManager.PasswordSignInAsync(user, appUser.Password, false, false);  if (signInResult.Succeeded)  {  return RedirectToAction("Index");  }  }  return RedirectToAction("Register");  }  public IActionResult Register()  {  return View();  }  [HttpPost]  public async Task<IActionResult> Register(AppUser appUser){  //register functionality  var user = new AppUser  {  Id = "101",  UserName = appUser.UserName,  Email = appUser.Email,  Name = appUser.Name,  DateOfBirth = appUser.DateOfBirth,  Password = appUser.Password  };  var result = await _userManager.CreateAsync(user, user.Password);  if (result.Succeeded)  {  // User sign  // sign in   var signInResult = await _signInManager.PasswordSignInAsync(user, user.Password, false, false);if (signInResult.Succeeded)  {  return RedirectToAction("Index");  }  }  return View();  }  public async Task<IActionResult> LogOut(string username, string password){  await _signInManager.SignOutAsync();  return RedirectToAction("Index");  }  }
}

第5步

@model DemoIdentityAuthentication.Models.AppUser  <h1>User Login</h1>  <form asp-controller="Home" asp-action="Login">  <div class="form-group col-sm-6">  <label for="Username">Username</label>  <input type="text" class="form-control" id="Username" asp-for="UserName" placeholder="Enter username">  </div>  <div class="form-group col-sm-6">  <label for="Password">Password</label>  <input type="password" class="form-control" id="Password" asp-for="Password" placeholder="Enter password">  </div>  <div class="form-group col-sm-6">  <button type="submit" class="btn btn-primary">Login</button>  </div>
</form>

@model DemoIdentityAuthentication.Models.AppUser  @{  ViewData["Title"] = "Register";
}  <h1>User Register</h1>  <form method="post" asp-controller="Home" asp-action="Register">  <div class="form-group col-sm-6">  <label for="Name">Name</label>  <input type="text" class="form-control" id="Name" asp-for="Name" placeholder="Enter name">  </div>  <div class="form-group col-sm-6">  <label for="EmailId">Email Id</label>  <input type="email" class="form-control" id="EmailId" asp-for="Email" placeholder="Enter email id">  </div>  <div class="form-group col-sm-6">  <label for="Username">Username</label>  <input type="text" class="form-control" id="Username" asp-for="UserName" placeholder="Enter username">  </div>  <div class="form-group col-sm-6">  <label for="Password">Password</label>  <input type="password" class="form-control" id="Password" asp-for="Password" placeholder="Enter password">  </div>  <div class="form-group col-sm-6">  <label for="DOB">Date Of Birth</label>  <input type="text" class="form-control" id="DOB" asp-for="DateOfBirth" placeholder="Enter date of birth">  </div>  <div class="form-group col-sm-6">  <button type="submit" class="btn btn-primary">Register</button>  </div>
</form>

@model DemoIdentityAuthentication.Models.AppUser  <h1>User Information</h1>  <table>  <tr>  <td>Name:- </td>  <td>@Html.DisplayFor(model => model.Name)</td>  </tr>  <tr>  <td>Email:- </td>  <td>@Html.DisplayFor(model => model.Email)</td>  </tr>  <tr>  <td>Username:- </td>  <td>@Html.DisplayFor(model => model.UserName)</td>  </tr>  <tr>  <td>Date Of Birth:- </td>  <td>@Html.DisplayFor(model => model.DateOfBirth)</td>  </tr>
</table>

第6步

<!DOCTYPE html>
<html lang="en">
<head>  <meta charset="utf-8" />  <meta name="viewport" content="width=device-width, initial-scale=1.0" />  <title>@ViewData["Title"] - DemoIdentityAuthentication</title>  <link rel="stylesheet" href="~/lib/bootstrap/dist/css/bootstrap.min.css" />  <link rel="stylesheet" href="~/css/site.css" />
</head>
<body>  <header>  <nav class="navbar navbar-expand-sm navbar-toggleable-sm navbar-light bg-white border-bottom box-shadow mb-3">  <div class="container">  <a class="navbar-brand" asp-area="" asp-controller="Home" asp-action="Index">DemoIdentityAuthentication</a>  <button class="navbar-toggler" type="button" data-toggle="collapse" data-target=".navbar-collapse" aria-controls="navbarSupportedContent"  aria-expanded="false" aria-label="Toggle navigation">  <span class="navbar-toggler-icon"></span>  </button>  <div class="navbar-collapse collapse d-sm-inline-flex flex-sm-row-reverse">  <ul class="navbar-nav flex-grow-1">  <li class="nav-item">  <a class="nav-link text-dark" asp-area="" asp-controller="Home" asp-action="Index">Home</a>  </li>  <li class="nav-item">  <a class="nav-link text-dark" asp-area=""asp-controller="Home" asp-action="Register">Register</a>  </li>  <li class="nav-item">  <a class="nav-link text-dark" asp-area="" asp-controller="Home" asp-action="Login">Login</a>  </li>  <li class="nav-item">  <a class="nav-link text-dark" asp-area="" asp-controller="Home" asp-action="UserInfo">User Information</a>  </li>  <li class="nav-item">  <a class="nav-link text-dark" asp-area="" asp-controller="Home" asp-action="Logout">Logout</a>  </li>  </ul>  </div>  </div>  </nav>  </header>  <div class="container">  <main role="main" class="pb-3">  @RenderBody()  </main>  </div>  <footer class="border-top footer text-muted">  <div class="container">  © 2020 - DemoIdentityAuthentication - <a asp-area="" asp-controller="Home" asp-action="Privacy">Privacy</a>  </div>  </footer>  <script src="~/lib/jquery/dist/jquery.min.js"></script>  <script src="~/lib/bootstrap/dist/js/bootstrap.bundle.min.js"></script>  <script src="~/js/site.js" asp-append-version="true"></script>  @RenderSection("Scripts", required: false)
</body>
</html>

运行您的应用程序