由於.Net MVC 5登陸和註冊方式有很多種，但是Identity方式去實現或許會更簡單更容易理解

首先新建一個項目

其次如下選擇Empty和MVC的選項

然後打開NuGet包管理器分別安裝幾個包

1. EntityFramework
2. Microsoft.AspNet.Identity.Core
3. Microsoft.AspNet.Identity.EntityFramework
4. Microsoft.AspNet.Identity.Owin
5. Modernizr
6. Microsoft.Owin.Host.SystemWeb
7. Bootstrap

然後往Models文件夾裏面添加ApplicationUser類，SignInModel類，SignUpModel類，ApplicationDbContext類，當然ApplicationDbContext類你也可以分到DbContext到另一個類庫，我這是做演示用的，分層不用麽這麽明確

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ApplicationUser類

ApplicationDbContext類

SignInModel類

SignUpModel類

然後往App_Start文件夾裏面添加ApplicationSignInManager類，ApplicationUserManager類，ApplicationUserStore類

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ApplicationUserManager類

ApplicationSignInManager類

ApplicationUserStore類

然後往Controller文件夾裏面添加HomeController控制器，AccountController控制器

先往HomeController控制器裏添加index視圖

index視圖代碼

@using Microsoft.AspNet.Identity
@{
    ViewBag.Title = "Index";
}

<h2>Index</h2>
@if (Request.IsAuthenticated)
{
    
 
using (Html.BeginForm("LogOff", "Account", FormMethod.Post, new { id = "logoutForm", @class = "navbar-right" }))
    {
        @Html.AntiForgeryToken()
        <p>Hello @User.Identity.GetUserName()</p>
        <ul>
            <li><a href="javascript:document.getElementById(‘logoutForm‘).submit()">Log off</a></li>
        </ul>
    }
}
else
{
    <ul>
        <li>
            @Html.ActionLink("Login", "Login", "Account")
        </li>
        <li>
            @Html.ActionLink("Register", "Register", "Account")
        </li>
    </ul>
}

然後AccountController控制器代碼

private ApplicationSignInManager signInManager;
        private ApplicationUserManager userManager;

        public ApplicationSignInManager SignInManager
        {
            get
            {
                return signInManager ?? HttpContext.GetOwinContext().Get<ApplicationSignInManager>();
            }
            private set
            {
                signInManager = value;
            }
        }
        public ApplicationUserManager UserManager
        {
            get { return userManager ?? HttpContext.GetOwinContext().GetUserManager<ApplicationUserManager>(); }
            private set
            {
                userManager = value;
            }
        }

        [AllowAnonymous]
        public ActionResult Login(string returnUrl)
        {
            ViewBag.ReturnUrl = returnUrl;
            return View();
        }
        [HttpPost]
        [AllowAnonymous]
        [ValidateAntiForgeryToken]
        public async Task<ActionResult> Login(SignInModel model, string returnUrl)
        {
            if (!ModelState.IsValid)
            {
                return View(model);
            }
            var result = await SignInManager.PasswordSignInAsync(model.Email, model.Password, model.RememberMe, shouldLockout: false);
            switch (result)
            {
                case SignInStatus.Success:
                    return RedirectToLocal(returnUrl);
                case SignInStatus.Failure:
                default:
                    ModelState.AddModelError("", "登陸無效");
                    return View(model);
            }

        }

        [AllowAnonymous]
        public ActionResult Register()
        {
            return View();
        }

        [HttpPost]
        [AllowAnonymous]
        [ValidateAntiForgeryToken]
        public async Task<ActionResult> Register(SignUpModel model)
        {
            if (ModelState.IsValid)
            {
                var user = new ApplicationUser { UserName = model.Email, Email = model.Email };
                var result = await UserManager.CreateAsync(user, model.Password);
                if (result.Succeeded)
                {
                    await SignInManager.SignInAsync(user, isPersistent: false, rememberBrowser: false);
                    return RedirectToAction("Index", "Home");
                }
                AddErrors(result);
            }
            return View(model);
        }
        [HttpPost]
        [ValidateAntiForgeryToken]
        public ActionResult LogOff()
        {
            AuthenticationManager.SignOut();
            return RedirectToAction("Index", "Home");
        }
        private void AddErrors(IdentityResult result)
        {
            foreach (var error in result.Errors)
            {
                ModelState.AddModelError("", error);
            }
        }
        private ActionResult RedirectToLocal(string returnUrl)
        {
            if (Url.IsLocalUrl(returnUrl))
            {
                return Redirect(returnUrl);
            }
            return RedirectToAction("Index", "Home");
        }
        private IAuthenticationManager AuthenticationManager
        {
            get { return HttpContext.GetOwinContext().Authentication; }
        }

然後分別添加生成Login和Register頁面

Login頁面代碼

@model IdentityDemo.Models.SignInModel

@{
    ViewBag.Title = "Login";
}

<h2>Login</h2>

@using (Html.BeginForm("Login", "Account", new { ReturnUrl = ViewBag.ReturnUrl }, FormMethod.Post))
{
    @Html.AntiForgeryToken()
    
    <div class="form-horizontal">
        <h4>SignInModel</h4>
        <hr />
        @Html.ValidationSummary(true, "", new { @class = "text-danger" })
        <div class="form-group">
            @Html.LabelFor(model => model.Email, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.TextBoxFor(model => model.Email, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.Email, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.Password, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.PasswordFor(model => model.Password, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.Password, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.RememberMe, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                <div class="checkbox">
                    @Html.CheckBoxFor(model => model.RememberMe)
                    @Html.ValidationMessageFor(model => model.RememberMe, "", new { @class = "text-danger" })
                </div>
            </div>
        </div>

        <div class="form-group">
            <div class="col-md-offset-2 col-md-10">
                <input type="submit" value="SignIn" class="btn btn-default" />
            </div>
        </div>
    </div>
}

<div>
    @Html.ActionLink("註冊", "Register")
</div>

Register頁面代碼

@model IdentityDemo.Models.SignUpModel

@{
    ViewBag.Title = "Register";
}

<h2>Register</h2>

@using (Html.BeginForm("Register", "Account", FormMethod.Post))
{
    @Html.AntiForgeryToken()
    
    <div class="form-horizontal">
        <h4>SignUpModel</h4>
        <hr />
        @Html.ValidationSummary(true, "", new { @class = "text-danger" })
        <div class="form-group">
            @Html.LabelFor(model => model.Email, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.TextBoxFor(model => model.Email, new { htmlAttributes = new { @class = "form-control" } })
                
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.Password, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.PasswordFor(model => model.Password, new { htmlAttributes = new { @class = "form-control" } })                
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.ConfirmPassword, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.PasswordFor(model => model.ConfirmPassword, new { htmlAttributes = new { @class = "form-control" } })
                
            </div>
        </div>

        <div class="form-group">
            <div class="col-md-offset-2 col-md-10">
                <input type="submit" value="SignUp" class="btn btn-default" />
            </div>
        </div>
    </div>
}

然後往項目的根目錄添加Startup類

然後修改根目錄的Web.Config文件

最後我們來測試一下看看效果怎麽樣，如下圖

Asp.Net MVC 5使用Identity之簡單的註冊和登陸