Asp.Net MVC Identity 2.2.1 使用技巧（六）

使用用户管理器之角色管理

一、建立模型，这里我们其实在之前的技巧（五）已经建好了。

二、建立控制器RolesAdminController 

1、在controllers文件夹上点右键》添加》控制器， 我这里选的是“MVC5 控制器-空”，名称设置为：RolesAdminController.cs。

2、添加操作权限。在空间命名下第一个{下面（9行）添加[Authorize(Roles = "Admin")]用以此控制器操作只有admin角色组有权限访问。如果你选择了之前的可选操作这里可以直接添加权限，否则要么改，要么先注释掉。

3、在public class RolesAdminController : Controller内添加如下代码：

        public RolesAdminController()
        {
        }

        public RolesAdminController(ApplicationUserManager userManager,
            ApplicationRoleManager roleManager)
        {
            UserManager = userManager;
            RoleManager = roleManager;
        }

        private ApplicationUserManager _userManager;
        public ApplicationUserManager UserManager
        {
            get
            {
                return _userManager ?? HttpContext.GetOwinContext().GetUserManager<ApplicationUserManager>();
            }
            set
            {
                _userManager = value;
            }
        }

        private ApplicationRoleManager _roleManager;
        public ApplicationRoleManager RoleManager
        {
            get
            {
                return _roleManager ?? HttpContext.GetOwinContext().Get<ApplicationRoleManager>();
            }
            private set
            {
                _roleManager = value;
            }
        }

添加完代码后，记得根据错误提示添加命名空间using xxx；

4、修改ActionResult Index()。用以显示角色列表。代码如下：

        //
        //显示角色清单
        // GET: /Roles/
        public ActionResult Index()
        {
            return View(RoleManager.Roles);
        }

5、添加角色详情操作

        //
        //异步读取角色详细信息
        // GET: /Roles/Details/5
        public async Task<ActionResult> Details(string id)
        {
            if (id == null)
            {
                return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
            }
            var role = await RoleManager.FindByIdAsync(id);
            // 读取角色内的用户列表。
            var users = new List<ApplicationUser>();
            foreach (var user in UserManager.Users.ToList())
            {
                if (await UserManager.IsInRoleAsync(user.Id, role.Name))
                {
                    users.Add(user);
                }
            }
            ViewBag.Users = users;
            ViewBag.UserCount = users.Count();
            return View(role);
        }

6、添加创建角色操作

        //
        // 读取角色创建
        // GET: /Roles/Create
        public ActionResult Create()
        {
            return View();
        }

        //
        //异步写入角色创建
        // POST: /Roles/Create
        [HttpPost]
        public async Task<ActionResult> Create(RoleViewModel roleViewModel)
        {
            if (ModelState.IsValid)
            {
                var role = new IdentityRole(roleViewModel.Name);
                //角色创建
                var roleresult = await RoleManager.CreateAsync(role);
                if (!roleresult.Succeeded)
                {
                    ModelState.AddModelError("", roleresult.Errors.First());
                    return View();
                }
                return RedirectToAction("Index");
            }
            return View();
        }

7、添加角色编辑操作

        //
        //异步读取角色编辑
        // GET: /Roles/Edit/Admin
        public async Task<ActionResult> Edit(string id)
        {
            if (id == null)
            {
                return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
            }
            //按id查找角色
            var role = await RoleManager.FindByIdAsync(id);
            if (role == null)
            {
                return HttpNotFound();
            }
            RoleViewModel roleModel = new RoleViewModel { Id = role.Id, Name = role.Name };
            return View(roleModel);
        }

        //
        //异步写入角色编辑
        // POST: /Roles/Edit/5
        [HttpPost]
        [ValidateAntiForgeryToken]
        public async Task<ActionResult> Edit([Bind(Include = "Name,Id")] RoleViewModel roleModel)
        {
            if (ModelState.IsValid)
            {
                //按id查找角色
                var role = await RoleManager.FindByIdAsync(roleModel.Id);
                role.Name = roleModel.Name;
                //更新角色信息
                await RoleManager.UpdateAsync(role);
                return RedirectToAction("Index");
            }
            return View();
        }

[ValidateAntiForgeryToken]为加密操作。

8、添加角色删除操作

        //
        //异步读取角色删除信息
        // GET: /Roles/Delete/5
        public async Task<ActionResult> Delete(string id)
        {
            if (id == null)
            {
                return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
            }
            var role = await RoleManager.FindByIdAsync(id);
            if (role == null)
            {
                return HttpNotFound();
            }
            return View(role);
        }

        //
        //异步写入角色删除信息
        // POST: /Roles/Delete/5
        [HttpPost, ActionName("Delete")]
        [ValidateAntiForgeryToken]
        public async Task<ActionResult> DeleteConfirmed(string id, string deleteUser)
        {
            if (ModelState.IsValid)
            {
                if (id == null)
                {
                    return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
                }
                var role = await RoleManager.FindByIdAsync(id);
                if (role == null)
                {
                    return HttpNotFound();
                }
                IdentityResult result;
                if (deleteUser != null)
                {
                    result = await RoleManager.DeleteAsync(role);
                }
                else
                {
                    result = await RoleManager.DeleteAsync(role);
                }
                if (!result.Succeeded)
                {
                    ModelState.AddModelError("", result.Errors.First());
                    return View();
                }
                return RedirectToAction("Index");
            }
            return View();
        }

角色管理的控制器编写结束。