AdminController中添加引用：

using Microsoft.AspNetCore.Authorization;

Index添加[Authorize]权限要求：

[Authorize]public IActionResult Index(){    return View();}

 StartUp.cs中添加引用：

using Microsoft.AspNetCore.Authentication;using Microsoft.AspNetCore.Authentication.Cookies;

StartUp.cs ConfigureServices中添加常量：

public void ConfigureServices(IServiceCollection services){    services.AddAuthentication(CookieAuthenticationDefaults.AuthenticationScheme)         .AddCookie();    services.AddMvc();}

添加中间件：

public void Configure(IApplicationBuilder app, IHostingEnvironment env) {
       app.UseAuthentication(); }

此时，访问Admin页面，自动跳转至Account/Login?ReturnUrl=%2FAdmin

添加AccountController.cs控制器，编写MakeLogin和Logout。此时访问Account/MakeLogin后，访问Admin能正常访问。

public class AccountController : Controller    {        public IActionResult MakeLogin()        {            var claims = new List
     
                  {                new Claim(ClaimTypes.Name,"liumuu"),                new Claim(ClaimTypes.Role,"admin")            };            var claimIdentity = new ClaimsIdentity(claims, CookieAuthenticationDefaults.AuthenticationScheme);            HttpContext.SignInAsync(CookieAuthenticationDefaults.AuthenticationScheme, new ClaimsPrincipal(claimIdentity));            return Ok();        }        public IActionResult Logout()        {            HttpContext.SignOutAsync();            return Ok();        }    }
     

 可自定义默认选项：

public void ConfigureServices(IServiceCollection services){    services.AddAuthentication(CookieAuthenticationDefaults.AuthenticationScheme)    .AddCookie(options =>    {         options.LoginPath = "/Account/Login";    });     services.AddMvc();}

 新建ViewModel：

public class RegisterViewModel    {        public string Email { get; set; }        public string Password { get; set; }        public string ConfirmPassword { get; set; }    }

public class LoginViewModel    {        [Required]        [DataType(DataType.EmailAddress)]        public string Email { get; set; }        [Required]        [DataType(DataType.Password)]        public string Password { get; set; }    }

@model RegisterViewModel@{    ViewData["Title"] = "Register";}
Register
     
    
      
        
       
            
        
Create Account
            
        
            
        
                
                         
                     
        
            
        
                
                         
                     
        
            
        
                
                         
                     
        
            
        Regtister        
       
    
      
     

@model LoginViewModel@{    ViewData["Title"] = "Login";}
Login
     
    
      
        
       
            
        
Use a Account to Login
            
        
            
        
                
                         
                     
        
            
        
                
                         
                     
        
            
        
                
         Login            
        
        
       
    
      
     

 创建Models：ApplicationUser.cs和ApplicationRole.cs：

public class ApplicationUser : IdentityUser
     
          {    }
     

public class ApplicationRole : IdentityRole
     
          {    }
     

数据连接：ApplicationDbContext.cs：

public class ApplicationDbContext : IdentityDbContext
     
          {        public ApplicationDbContext(DbContextOptions
      
        options) : base(options)        {        }    }
      
     

appsettings.json中添加数据链接：

{  "Logging": {    "IncludeScopes": false,    "LogLevel": {      "Default": "Warning"    }  },  "GetConnectionString": {    "Default": "Data Source  = .; Database = database; User ID = sa; Password = 123"  }}

StartUp.cs中添加数据引用、密码设置等：

public void ConfigureServices(IServiceCollection services)        {            services.AddDbContext
     
      (options =>            {                options.UseSqlServer(Configuration.GetConnectionString("Default"));            });            services.AddIdentity
      
       ()                .AddEntityFrameworkStores
       
        ()                .AddDefaultTokenProviders();            services.AddAuthentication(CookieAuthenticationDefaults.AuthenticationScheme)                .AddCookie(options =>                {                    options.LoginPath = "/Account/Login";                });            services.Configure
        
         (options =>            {                options.Password.RequireUppercase = false;                options.Password.RequireNonAlphanumeric = false;                options.Password.RequireLowercase = false;            });            services.AddMvc();        }
        
       
      
     

 编辑AccountController.cs：

private UserManager
     
       _userManager;private SignInManager
      
        _signInManager;public AccountController(UserManager
       
         userManager, SignInManager
        
          signInManager){      _userManager = userManager;      _signInManager = signInManager;}
        
       
      
     

[HttpPost]public async Task
     
       Register(RegisterViewModel registerViewModel)    {        var identityUser = new ApplicationUser        {            Email = registerViewModel.Email,            UserName = registerViewModel.Email,            NormalizedUserName = registerViewModel.Email        };        var identityResult = await _userManager.CreateAsync(identityUser, registerViewModel.Password);        if (identityResult.Succeeded)        {            return RedirectToAction("Index", "Home");        }        return View();}