ASP.NET Core 3.1 实际操作摸索学习 （Identity部分） - 2

接上篇： ASP.NET Core 3.1 实际操作摸索学习 （Identity部分）- 1

小应用是考虑由管理员来导入或手工输入来新建账号，然后分配相应权限来浏览不同页面；

所以考虑做些小的修改调整来适用于一个内部小应用； （比较惭愧，还没来得及研究Razor Page ，只好先用会的二把刀MVC上了 ）

新建一个 UserAdmin的控制器，就用空的来写吧：

 右键点击打开的 UserAdminController 的

 View也用空的来吧： 

 

妖怪的是，怎么没像VS2017 MVC4或MVC5那样，直接在Views目录下建个和控制器相同名字的目录，然后再在里面建好View呢？（目前还没想明白）

  为了规范点，还是把 Index.cshtml 手动删除，在Views目录下再建个UserAdmin目录，再建个Index的View: 

  

 我把这个UserAdmin放在 Home和Privacy菜单的中间吧，修改_Layout.cshtml

                        <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="UserAdmin" asp-action="Index">用户管理</a>
                        </li>
                        <li class="nav-item">
                            <a class="nav-link text-dark" asp-area="" asp-controller="Home" asp-action="Privacy">Privacy</a>
                        </li> 

首先，先在UserAdmin/Index页面把所有用户列出，并提供编辑、删除按钮： (Index View代码：) 

@using Microsoft.AspNetCore.Identity
@model IEnumerable<IdentityUser>
@{
    ViewBag.Title = "Index";
}
<div class="panel panel-primary">
    <div class="panel-heading">
        用户列表
    </div>
    <table class="table table-striped">
        <tr><th>Name</th><th>Email</th><th>PhoneNumber</th><th></th></tr>
        @if (Model.Count() == 0)
        {
            <tr><td colspan="4" class="text-center">无用户</td></tr>
        }
        else
        {
            foreach (IdentityUser user in Model)
            {
                <tr>        
                    <td>@user.UserName</td>
                    <td>@user.Email</td>
                    <td>@user.PhoneNumber</td>
                    <td>
                            @Html.ActionLink("密码重置", "ResetPassword", new { id = user.Id },
                                new { @class = "btn btn-warning btn-xs" })
                            @Html.ActionLink("编辑", "Edit", new { id = user.Id },
                                new { @class = "btn btn-primary btn-xs" })
                            @Html.ActionLink("删除", "Delete", new { id = user.Id },
                            new { @class = "btn btn-danger btn-xs" })
                    </td>
                </tr>
            }
        }
    </table>
</div>

UserAdmin控制器代码，先把所有用户传到Index View上显示：

    public class UserAdminController : Controller
    {       private readonly UserManager<IdentityUser> _userManager;

        public UserAdminController(UserManager<IdentityUser> userManager)
        {
            _userManager = userManager;            
        }

        public IActionResult Index()
        {            
            return View(_userManager.Users);
        }
    }

实现结果：

由于应用是一个内部查询应用，密码复杂度要求不需要那么高，调整为长度4位，其他没要求。。。

在Startup.cs 的ConfigureServices 中加入对于密码策略的调整：

public void ConfigureServices(IServiceCollection services)
{
　　services.AddDbContext<ApplicationDbContext>(options =>
　　options.UseSqlServer(
　　Configuration.GetConnectionString("MyConnection")));
　　services.AddDefaultIdentity<IdentityUser>(options =>
　　{
　　　　options.SignIn.RequireConfirmedAccount = true;
　　　　options.Password.RequireDigit = false;
　　　　options.Password.RequiredLength = 4;
　　　　options.Password.RequireLowercase = false;
　　　　options.Password.RequireNonAlphanumeric = false;
　　　　options.Password.RequireUppercase = false;
　　}).AddEntityFrameworkStores<ApplicationDbContext>();
　　services.AddControllersWithViews();
　　services.AddRazorPages();
}

另外，需要把Register.cshtml.cs 中定义的InputModel中的Password的最小长度调整为4：

            [Required]
            [StringLength(100, ErrorMessage = "The {0} must be at least {2} and at max {1} characters long.", MinimumLength = 4)]
            [DataType(DataType.Password)]
            [Display(Name = "Password")]
            public string Password { get; set; }

用户管理主页面肯定要考虑认证及角色的问题，不可能让未登录用户就可以打开，也不可能让所有登录用户都可以打开，必须是个管理员才可以打开；

那么考虑增加一个角色管理页面来为用户分配角色；

先添加一个RoleAdmin控制器：

 

 

 再手动在Views目录加一个 RoleAdmin目录，在其中加一个Index的空View:

 

 修改RoleAdmin控制器：

    public class RoleAdminController : Controller
    {
        private readonly RoleManager<IdentityRole> _roleManager;

        public RoleAdminController(RoleManager<IdentityRole> roleManager)
        {
            _roleManager = roleManager;
        }

        public IActionResult Index()
        {
            return View(_roleManager.Roles);
        }
    }

修改RoleAdmin Index的View:

@using Microsoft.AspNetCore.Identity
@model IEnumerable<IdentityRole>
@{
    ViewBag.Title = "Index";
}
<div class="panel panel-primary">
    <div class="panel-heading">
        角色列表
    </div>
    <table class="table table-striped">
        <tr><th>Name</th><th></th></tr>
        @if (Model.Count() == 0)
        {
            <tr><td colspan="4" class="text-center">无角色</td></tr>
        }
        else
        {
            foreach (IdentityRole role in Model)
            {
                <tr>
                    <td>@role.Name</td>                    
                    <td>                        
                        @Html.ActionLink("编辑", "Edit", new { id = role.Id },
                            new { @class = "btn btn-primary btn-xs" })
                        @Html.ActionLink("删除", "Delete", new { id = role.Id },
                        new { @class = "btn btn-danger btn-xs" })
                    </td>
                </tr>
            }
        }
    </table>
</div>
@Html.ActionLink("新建", "Create","RoleAdmin",null, new { @class = "btn btn-primary btn-xs" })

修改 _Layout视图，加上快捷按钮：

                        <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="UserAdmin" asp-action="Index">用户管理</a>
                        </li>
                        <li class="nav-item">
                            <a class="nav-link text-dark" asp-area="" asp-controller="RoleAdmin" asp-action="Index">角色管理</a>
                        </li>
                        <li class="nav-item">
                            <a class="nav-link text-dark" asp-area="" asp-controller="Home" asp-action="Privacy">Privacy</a>
                        </li>

跑起来看到有角色管理这个按钮了：

 

但是如果直接点击 角色管理，就会出现以下错误：

 

 

 

初步研究，应该是没有在ConfigureServices没有加这个（应该怎么描述？ 依赖注入？）

services.AddDefaultIdentity<IdentityUser>(options =>
{
　　options.SignIn.RequireConfirmedAccount = true;
　　options.Password.RequireDigit = false;
　　options.Password.RequiredLength = 4;
　　options.Password.RequireLowercase = false;
　　options.Password.RequireNonAlphanumeric = false;
　　options.Password.RequireUppercase = false;
})
.AddRoles<IdentityRole>()
.AddRoleManager<RoleManager<IdentityRole>>()
.AddEntityFrameworkStores<ApplicationDbContext>();

这下没有问题了，可以打开RoleAdmin页面：

再为RoleAdmin加上 Create的两个Action：

        public ActionResult Create()
        {
            return View();
        }

        [HttpPost]
        public async Task<ActionResult> Create([Required] string name)
        {
            if (ModelState.IsValid)
            {
                IdentityResult result = await _roleManager.CreateAsync(new IdentityRole(name));
                if (result.Succeeded)
                {
                    return RedirectToAction("Index");
                }
                else
                {
                    AddErrorsFromResult(result);
                }
            }
            return View();
        }

        private void AddErrorsFromResult(IdentityResult result)
        {
            foreach (IdentityError error in result.Errors)
            {
                ModelState.AddModelError("", error.Description);
            }
        }

在RoleAdmin的view目录下，新增一个Create View:

@model string
@{ ViewBag.Title = "新增角色";}
<h2>新增角色</h2>
@Html.ValidationSummary(false)
@using (Html.BeginForm())
{
    <div class="form-group">
        <label>Name</label>
        <input name="name" value="@Model" class="form-control" />
    </div>
    <button type="submit" class="btn btn-primary">新增</button>
    @Html.ActionLink("取消", "Index", "RoleAdmin", null, new { @class = "btn btn-default btn-xs" })
}

跑起来以后：

 

 

新增2个Role :   Admin和NormalUser

 

 下一步考虑为Role来加减下属用户； 本处参考了：https://www.cnblogs.com/r01cn/p/5180892.html#Ch14_3_6  原ASP.NET Identity的一部分代码，学习了其的操作逻辑；

先增加两个ViewModel

    public class RoleViewModel
    {
        public IdentityRole Role { get; set; }
        public IEnumerable<IdentityUser> Members { get; set; }
        public IEnumerable<IdentityUser> NonMembers { get; set; }        
    }

    public class RoleModificationModel
    {
        [Required]
        public string RoleName { get; set; }
        public string[] IdsToAdd { get; set; }
        public string[] IdsToDelete { get; set; }
    }

using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Identity;
using Microsoft.AspNetCore.Mvc;
using MyCoreTest1.Models;

namespace MyCoreTest1.Controllers
{
    public class RoleAdminController : Controller
    {
        private readonly RoleManager<IdentityRole> _roleManager;
        private readonly UserManager<IdentityUser> _userManager;

        public RoleAdminController(RoleManager<IdentityRole> roleManager, UserManager<IdentityUser> userManager)
        {
            _roleManager = roleManager;
            _userManager = userManager;
        }
        public async Task<IActionResult> Index()
        {
            List<RoleViewModel> roleviewmodels = new List<RoleViewModel>();
            foreach(IdentityRole role in _roleManager.Roles)
            {
                RoleViewModel newrole = new RoleViewModel();
                newrole.Role = role;
                newrole.Members = await _userManager.GetUsersInRoleAsync(role.Name);                
                roleviewmodels.Add(newrole);
            }
            return View(roleviewmodels);
        }

        public ActionResult Create()
        {
            return View();
        }

        [HttpPost]
        public async Task<ActionResult> Create([Required] string name)
        {
            if (ModelState.IsValid)
            {
                IdentityResult result = await _roleManager.CreateAsync(new IdentityRole(name));
                if (result.Succeeded)
                {
                    return RedirectToAction("Index");
                }
                else
                {
                    AddErrorsFromResult(result);
                }
            }
            return View();
        }

        private void AddErrorsFromResult(IdentityResult result)
        {
            foreach (IdentityError error in result.Errors)
            {
                ModelState.AddModelError("", error.Description);
            }
        }

        public async Task<ActionResult> Edit(string id)
        {
            IdentityRole role = await _roleManager.FindByIdAsync(id);
            
            IEnumerable<IdentityUser> members
                    = await _userManager.GetUsersInRoleAsync(role.Name);

            List<IdentityUser> nonMembers = new List<IdentityUser>();
            foreach (IdentityUser user in _userManager.Users)
            {
                if (!members.Any(x => x.Id.Equals(user.Id)))
                {
                    nonMembers.Add(user);
                }
            }

            return View(new RoleViewModel
            {
                Role = role,
                Members = members,
                NonMembers = nonMembers
            });
        }


        [HttpPost]
        public async Task<ActionResult> Edit(RoleModificationModel model)
        {
            IdentityResult result;
            if (ModelState.IsValid)
            {
                foreach (string userId in model.IdsToAdd ?? new string[] { })
                {
                    var user = await _userManager.FindByIdAsync(userId);

                    result = await _userManager.AddToRoleAsync(user, model.RoleName);
                    if (!result.Succeeded)
                    {
                        return View("Error", result.Errors);
                    }
                }
                foreach (string userId in model.IdsToDelete ?? new string[] { })
                {
                    var user = await _userManager.FindByIdAsync(userId);
                    result = await _userManager.RemoveFromRoleAsync(user,
                       model.RoleName);
                    if (!result.Succeeded)
                    {
                        return View("Error", result.Errors);
                    }
                }
                return RedirectToAction("Index");
            }
            return View("Error", new string[] { "Role Not Found" });
        }

    }
}

RoleAdmin改写成以上，首先是把  RoleManager<IdentityRole> roleManager, UserManager<IdentityUser> userManager  传进来；

再把Index的Action 修改一下，可以传一个带用户列表的View Model到前台；

另外，把Edit 的两个Action 按照参考资料里的写法稍微修改一下，来实现Role下属User 的增加删除；

Index的View改成：

@using Microsoft.AspNetCore.Identity
@model IEnumerable<RoleViewModel>
@{
    ViewBag.Title = "Index";
}
<div class="panel panel-primary">
    <div class="panel-heading">
        角色列表
    </div>
    <table class="table table-striped">
        <tr><th>角色名</th><th>下属用户</th><th></th></tr>
        @if (Model.Count() == 0)
        {
            <tr><td colspan="4" class="text-center">无角色</td></tr>
        }
        else
        {
            foreach (RoleViewModel roleview in Model)
            {
                <tr>
                    <td>@roleview.Role.Name</td>
                    <td>
                        @foreach (IdentityUser user in @roleview.Members)
                        {
                            @user.UserName@Html.Label(";")                            
                        }
                    </td>
                    <td>@Html.ActionLink("编辑", "Edit", new { id = roleview.Role.Id },new { @class = "btn btn-primary btn-xs" })
                        @Html.ActionLink("删除", "Delete", new { id = roleview.Role.Id },new { @class = "btn btn-danger btn-xs" })
                    </td>
                </tr>
            }
        }
    </table>
</div>
@Html.ActionLink("新建", "Create","RoleAdmin",null, new { @class = "btn btn-primary btn-xs" })

Role Edit的View改成：

@using MyCoreTest1.Models
@using Microsoft.AspNetCore.Identity
@model RoleViewModel
@{ ViewBag.Title = "Edit Role";}
@Html.ValidationSummary()
@using (Html.BeginForm())
{
    <input type="hidden" name="roleName" value="@Model.Role.Name" />
    <div class="panel panel-primary">
        <div class="panel-heading">添加用户至角色：@Model.Role.Name</div>
        <table class="table table-striped">
            @if (Model.NonMembers.Count() == 0)
            {
                <tr><td colspan="2">所有用户已添加</td></tr>
            }
            else
            {
                <tr><td>用户名</td><td>添加至角色</td></tr>
                foreach (IdentityUser user in Model.NonMembers)
                {
                    <tr>
                        <td>@user.UserName</td>
                        <td>
                            <input type="checkbox" name="IdsToAdd" value="@user.Id">
                        </td>
                    </tr>
                }
            }
        </table>
    </div>
    <div class="panel panel-primary">
        <div class="panel-heading">从角色：@Model.Role.Name 中移除用户</div>
        <table class="table table-striped">
            @if (Model.Members.Count() == 0)
            {
                <tr><td colspan="2">无下属用户</td></tr>
            }
            else
            {
                <tr><td>用户名</td><td>从角色中移除</td></tr>
                foreach (IdentityUser user in Model.Members)
                {
                    <tr>
                        <td>@user.UserName</td>
                        <td>
                            <input type="checkbox" name="IdsToDelete" value="@user.Id">
                        </td>
                    </tr>
                }
            }
        </table>
    </div>
    <button type="submit" class="btn btn-primary">保存</button>
    @Html.ActionLink("取消", "Index", null, null, new { @class = "btn btn-default" })
}

最后效果：

 

 

 最后把角色管理页面加上 指定的角色才可以打开：

 

 这样，非Admin角色的用户就打不开了：   （如果非登录状态，就直接自动跳转登录页面）

 

只有 Admin角色的用户可以打开 角色管理页面：

 下面准备修改 用户管理页面，使得管理员可以 新建、批量导入、重置用户密码等操作； 

 增加两个User View Model 和一个密码重置用 Model：

    public class UserEditViewModel
    {
        public IdentityUser User { get; set; }
        public IEnumerable<string> Roles { get; set; }
        public IEnumerable<IdentityRole> AllRoles { get; set; }
    }

    public class UserModificationModel
    {
        [Required]
        public string Id { get; set; }
        public string UserName { get; set; }
        public string Email { get; set; }
        public string PhoneNumber { get; set; }
        public string[] RolesToAdd { get; set; }
    }

    public class ResetPasswordInputModel
    {
        public string Id { get; set; }
        [Display(Name = "用户账号")]
        public string UserName { get; set; }
        [Required]
        [StringLength(100, ErrorMessage = "{0}必须长度为：{2} - {1}.", MinimumLength = 4)]
        [DataType(DataType.Password)]
        [Display(Name = "新密码")]
        public string Password { get; set; }

        [DataType(DataType.Password)]
        [Display(Name = "确认密码")]
        [Compare("Password", ErrorMessage = "两次密码输入不一致！")]
        public string ConfirmPassword { get; set; }
    }

修改UserAdmin/Index 的 View：

@using Microsoft.AspNetCore.Identity
@model IEnumerable<UserEditViewModel>
@{
    ViewData["Title"] = "用户列表";
}
<h1>@ViewData["Title"]</h1>
<hr />
<div class="panel panel-primary">   
    <table class="table table-striped">
        <tr><th>账号</th><th>邮箱</th><th>电话</th><th>角色</th><th>操作</th></tr>
        @if (Model.Count() == 0)
        {
            <tr><td colspan="4" class="text-center">无用户</td></tr>
        }
        else
        {
            foreach (UserEditViewModel userview in Model)
            {
                <tr>
                    <td>@userview.User.UserName</td>
                    <td>@userview.User.Email</td>
                    <td>@userview.User.PhoneNumber</td>
                    <td>
                        @foreach (string rolename in @userview.Roles)
                        {
                            @Html.Label(rolename + ";")
                        }
                    </td>
                    <td>
                        @Html.ActionLink("密码重置", "ResetPassword", new { id = userview.User.Id },
                                     new { @class = "btn btn-warning btn-xs" })
                        @Html.ActionLink("编辑", "Edit", new { id = userview.User.Id },
                                     new { @class = "btn btn-primary btn-xs" })
                        @Html.ActionLink("删除", "Delete", new { id = userview.User.Id },
                                 new { @class = "btn btn-danger btn-xs" })
                    </td>
                </tr>
            }
        }
    </table>
</div>

以及对应的Index Action：

        public async Task<IActionResult> Index()
        {
            List<UserEditViewModel> userViewModels = new List<UserEditViewModel>();
            foreach(IdentityUser user in _userManager.Users)
            {
                UserEditViewModel newuserviewmodel = new UserEditViewModel();
                newuserviewmodel.User = user;
                newuserviewmodel.Roles = await _userManager.GetRolesAsync(user);               
                userViewModels.Add(newuserviewmodel);
            }
            return View(userViewModels);
        }

效果：

 

 密码重置及编辑对应的Action：

　　　　　　private readonly UserManager<IdentityUser> _userManager;
　　　　　　private readonly RoleManager<IdentityRole> _roleManager;

　　　　　　public UserAdminController(UserManager<IdentityUser> userManager, RoleManager<IdentityRole> roleManager)
　　　　　　{
　　　　　　　　_userManager = userManager;
　　　　　　　　_roleManager = roleManager;
　　　　　　}

　　　　　public async Task<ActionResult> ResetPassword(string id)
        {
            if (id == null)
            {
                return NotFound();
            }
            IdentityUser user = await _userManager.FindByIdAsync(id);
            if (user == null)
            {
                return NotFound();
            }
            ResetPasswordInputModel resetuser = new ResetPasswordInputModel();
            resetuser.Id = user.Id;
            resetuser.UserName = user.UserName;
            return View(resetuser);
        }

        [HttpPost]
        public async Task<ActionResult> ResetPassword(ResetPasswordInputModel input)
        {
            if (ModelState.IsValid)
            {
                IdentityUser user = await _userManager.FindByIdAsync(input.Id);
                var passwordresettoken = await _userManager.GeneratePasswordResetTokenAsync(user);
                await _userManager.ResetPasswordAsync(user, passwordresettoken, input.Password);
                return RedirectToAction("Index");
            }
            return View();
        }


        public async Task<ActionResult> Edit(string id)
        {
            if (id == null)
            {
                return NotFound();
            }
            IdentityUser user = await _userManager.FindByIdAsync(id);
            if (user == null)
            {
                return NotFound();
            }
            UserEditViewModel edituser = new UserEditViewModel();
            edituser.User = user;
            edituser.Roles = await _userManager.GetRolesAsync(user);
            edituser.AllRoles = _roleManager.Roles;
            return View(edituser);
        }


        [HttpPost]
        public async Task<ActionResult> Edit(UserModificationModel model)
        {            
            if (ModelState.IsValid)
            {
                IdentityUser user = await _userManager.FindByIdAsync(model.Id);
                if (user == null)
                {
                    return View("Error", new string[] { "User Not Found" });
                }
                user.Email = model.Email;
                user.PhoneNumber = model.PhoneNumber;

                var rolesselect = model.RolesToAdd ?? new string[] { };
                foreach(string role in rolesselect)
                {
                    if(await _userManager.IsInRoleAsync(user, role))
                    {

                    }
                    else
                    {
                        await _userManager.AddToRoleAsync(user, role);
                    }
                }
                
                //还需要去除被反勾选的Role
                var userroles = await _userManager.GetRolesAsync(user);
                foreach(string role in userroles)
                {
                    if(!rolesselect.Contains(role))
                    {
                        await _userManager.RemoveFromRoleAsync(user, role);
                    }
                }
                await _userManager.UpdateAsync(user);

                return RedirectToAction("Index");
            }
            return View("Error", new string[] { "User Not Found" });
        }

在UserAdmin View目录下增加 ResetPassword View：

@model ResetPasswordInputModel
@{
    ViewData["Title"] = "重置用户密码";
}
<h1>@ViewData["Title"]</h1>
<hr />
<div class="row">
    <div class="col-md-4">
        <form asp-action="ResetPassword">
            <div asp-validation-summary="ModelOnly" class="text-danger"></div>
            <input type="hidden" asp-for="Id" />
            <div class="form-group">
                <label asp-for="UserName" class="control-label"></label>
                <input asp-for="UserName" class="form-control" readonly="readonly" />
                <span asp-validation-for="UserName" class="text-danger"></span>
            </div>
            <div class="form-group">
                <label asp-for="Password" class="control-label"></label>
                <input asp-for="Password" class="form-control" />
                <span asp-validation-for="Password" class="text-danger"></span>
            </div>
            <div class="form-group">
                <label asp-for="ConfirmPassword" class="control-label"></label>
                <input asp-for="ConfirmPassword" class="form-control" />
                <span asp-validation-for="ConfirmPassword" class="text-danger"></span>
            </div>            
            <div class="form-group">
                <input type="submit" value="Save" class="btn btn-primary" />
            </div>
        </form>
    </div>
</div>

<div>
    <a asp-action="Index">返回目录</a>
</div>

@section Scripts {
    @{await Html.RenderPartialAsync("_ValidationScriptsPartial");}
}

效果：

 

 在UserAdmin View目录下再加一个Edit的View：

@using Microsoft.AspNetCore.Identity
@model UserEditViewModel
@{
    ViewData["Title"] = "编辑用户信息";
}
<h1>@ViewData["Title"]</h1>
<hr />
<div class="row">
    <div class="col-md-4">
        <form asp-action="Edit">
            <div asp-validation-summary="ModelOnly" class="text-danger"></div>
            <input type="hidden" asp-for="User.Id" />
            <div class="form-group">
                <label asp-for="User.UserName" class="control-label"></label>
                <input asp-for="User.UserName" class="form-control" readonly="readonly" />
                <span asp-validation-for="User.UserName" class="text-danger"></span>
            </div>
            <div class="form-group">
                <label asp-for="User.Email" class="control-label"></label>
                <input asp-for="User.Email" name="Email" class="form-control" />
                <span asp-validation-for="User.Email" class="text-danger"></span>
            </div>
            <div class="form-group">
                <label asp-for="User.PhoneNumber" class="control-label"></label>
                <input asp-for="User.PhoneNumber" name="PhoneNumber" class="form-control" />
                <span asp-validation-for="User.PhoneNumber" class="text-danger"></span>
            </div>
            <div class="form-group">
                <label class="control-label">用户角色：</label>
                @foreach (IdentityRole role in Model.AllRoles)
                {
            <tr>
                <td>@role.Name</td>
                <td>
                    @if (@Model.Roles.Contains(role.Name))
                    {
                        <input type="checkbox" name="RolesToAdd" value="@role.Name" checked="checked" />
                    }
                    else
                    {
                        <input type="checkbox" name="RolesToAdd" value="@role.Name" />
                    }
                </td>
            </tr>
                }
            </div>
            <div class="form-group">
                <input type="submit" value="Save" class="btn btn-primary" />
            </div>
        </form>
    </div>
</div>

<div>
    <a asp-action="Index">返回目录</a>
</div>

@section Scripts {
    @{await Html.RenderPartialAsync("_ValidationScriptsPartial");}
}

效果：

 

 最后把用户管理 加上认证要求：