在 ASP.Net Core 中添加或删除角色中的用户

StudentManagement/StudentManagement/Controllers/AdminController.cs

@@ -0,0 +1,264 @@
+using Microsoft.AspNetCore.Identity;
+using Microsoft.AspNetCore.Mvc;
+using StudentManagement.Models;
+using StudentManagement.ViewModels;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace StudentManagement.Controllers
+{
+    public class AdminController:Controller
+    {
+        private RoleManager<IdentityRole> roleManager;
+        private UserManager<ApplicationUser> userManager;
+
+        public AdminController(RoleManager<IdentityRole> roleManager,UserManager<ApplicationUser> userManager)
+        {
+            this.roleManager = roleManager;
+            this.userManager = userManager;
+        }
+
+
+
+        // GET  Post 
+
+        [HttpGet]
+        public  IActionResult CreateRole()
+        {
+
+            return View();
+        }
+
+
+        [HttpPost]
+        public async Task<IActionResult> CreateRole(CreateRoleViewModel model)
+        {
+            if (ModelState.IsValid)
+            {
+
+                IdentityRole identityRole = new IdentityRole
+                {
+                    Name = model.RoleName
+                };
+
+                //如果您尝试创建具有已存在的同名的角色，则会收到验证错误。
+                IdentityResult result =   await roleManager.CreateAsync(identityRole);
+
+                if (result.Succeeded)
+                {
+                    return RedirectToAction("ListRoles", "Admin");
+                }
+
+
+                foreach (var error in result.Errors)
+                {
+                    ModelState.AddModelError("", error.Description);
+                }
+
+
+            }
+
+
+
+            return View(model);
+        }
+
+
+
+        public IActionResult ListRoles()
+        {
+
+            var roles = roleManager.Roles;
+
+            return View(roles);
+        }
+
+
+        [HttpGet]
+        public async Task<IActionResult> EditRole(string id)
+        {
+            var role = await roleManager.FindByIdAsync(id);
+            if (role == null)
+            {
+                ViewBag.ErrorMessage = $"角色id为{id}的信息不存在，请重试。";
+                return View("NotFound");
+            }
+
+            var model = new EditRoleViewModel
+            {
+                Id = role.Id,
+                RoleName = role.Name
+            };
+
+            var users = userManager.Users.ToList();
+            foreach (var user in users)
+            {
+                //如果用户拥有此角色，请将用户名添加到
+                //EditRoleViewModel模型中的Users属性中
+
+                if (await userManager.IsInRoleAsync(user,role.Name))
+                {
+                    model.Users.Add(user.UserName);
+                }
+            }
+            //然后将对象传递给视图显示到客户端
+            return View(model);
+
+        }
+
+
+
+
+        [HttpPost]
+        public async Task<IActionResult> EditRole(EditRoleViewModel model)
+        {
+            var role =await roleManager.FindByIdAsync(model.Id);
+
+            if (role == null)
+            {
+                ViewBag.ErrorMessage = $"角色id为{model.Id}的信息不存在，请重试。";
+                return View("NotFound");
+            }
+            else
+            {
+                role.Name = model.RoleName;
+
+             var result= await  roleManager.UpdateAsync(role);
+
+                if (result.Succeeded)
+                {
+                    return RedirectToAction("ListRoles");
+                }
+
+                foreach (var error in result.Errors)
+                {
+
+                    ModelState.AddModelError("", error.Description);
+
+                }
+
+
+                return View(model);
+
+            }
+
+
+
+
+
+
+
+        }
+
+
+        [HttpGet]
+        public async Task<IActionResult> EditUsersInRole(string roleId)
+        {
+            ViewBag.roleId = roleId;
+
+
+            var role = await roleManager.FindByIdAsync(roleId);
+
+            if (role == null)
+            {
+                ViewBag.ErrorMessage = $"角色id为{roleId}的信息不存在，请重试。";
+                return View("NotFound");
+            }
+
+            var model = new List<UserRoleViewModel>();
+
+
+            foreach (var user in userManager.Users)
+            {
+
+                var userRoleViewmodel = new UserRoleViewModel
+                {
+                    UserId = user.Id,
+                    UserName = user.UserName
+                };
+
+                if (await userManager.IsInRoleAsync(user, role.Name))
+                {
+                    userRoleViewmodel.IsSelected = true;
+                }
+                else
+                {
+                    userRoleViewmodel.IsSelected = false;
+
+                }
+
+
+                model.Add(userRoleViewmodel);      
+
+            }
+
+
+
+            return View(model);
+
+        }
+
+        [HttpPost]
+        public async Task<IActionResult> EditUsersInRole(List<UserRoleViewModel> model, string roleId)
+        {
+
+            var role = await roleManager.FindByIdAsync(roleId);
+            if (role == null)
+            {
+                ViewBag.ErrorMessage = $"角色id为{roleId}的信息不存在，请重试。";
+                return View("NotFound");
+            }
+
+
+            for (int i = 0; i < model.Count; i++)
+            {
+                var user = await userManager.FindByIdAsync(model[i].UserId);               
+
+                var isInRole = await userManager.IsInRoleAsync(user,role.Name);
+                IdentityResult result = null;
+
+                //被选中，不属于该角色，这个时候，添加到角色中。
+                if (model[i].IsSelected&&!isInRole)
+                {
+                     result =await userManager.AddToRoleAsync(user,role.Name);
+                }
+                //没有被选中，但是用户已经在角色中，移除出来
+                else if (!model[i].IsSelected&&isInRole)
+                {
+              result =await userManager.RemoveFromRoleAsync(user,role.Name); 
+                }
+                else//被选中，已经存角色中，不发生任何改变的数据
+                {
+                    continue;//跳出当次循环
+                }
+
+                if (result.Succeeded)
+                {
+                    //7个总用户数，0开始进行索引。
+                    if (i<(model.Count-1))
+                    {
+                        continue;
+                    }
+                    else
+                    {
+                        return RedirectToAction("EditRole", new { id = roleId });
+
+                    }
+
+
+                }               
+
+
+
+            }
+
+            return RedirectToAction("EditRole", new { id = roleId });
+        }
+
+
+
+
+    }
+}

StudentManagement/StudentManagement/ViewModels/CreateRoleViewModel.cs

@@ -0,0 +1,13 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace StudentManagement.ViewModels
+{
+    public class CreateRoleViewModel
+    {
+
+        [Required]
+        [Display(Name ="角色")]
+        public string RoleName { get; set; }
+
+    }
+}

StudentManagement/StudentManagement/ViewModels/EditRoleViewModel.cs

@@ -0,0 +1,30 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace StudentManagement.ViewModels
+{
+    public class EditRoleViewModel
+    {
+
+        public EditRoleViewModel()
+        {
+            Users = new List<string>();
+        }
+
+
+        [Display(Name ="角度Id")]
+        public string Id { get; set; }
+
+        [Required]
+        [Display(Name = "角色名称")]
+        public string RoleName { get; set; }
+
+
+        public List<string> Users { get; set; }
+
+
+    }
+}

StudentManagement/StudentManagement/ViewModels/UserRoleViewModel.cs

@@ -0,0 +1,18 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace StudentManagement.ViewModels
+{
+    public class UserRoleViewModel
+    {
+        public string UserId { get; set; }
+
+        public string UserName { get; set; }
+
+        public bool IsSelected { get; set; }
+
+
+    }
+}

StudentManagement/StudentManagement/Views/Admin/CreateRole.cshtml

@@ -0,0 +1,34 @@
+@model CreateRoleViewModel
+
+@{ 
+    ViewBag.Title = "创建角色";
+}
+
+
+
+    <form asp-action="CreateRole" method="post" class="mt-3">
+
+        <div asp-validation-summary="All" class="text-danger"></div>
+
+        <div class="form-group  row">
+
+            <label asp-for="RoleName" class="col-sm-2 col-form-label "></label>
+            <div class="col-sm-10">
+                <input asp-for="RoleName" class=" form-control" placeholder="请输入角色名称" />
+                <span asp-validation-for="RoleName" class="text-danger"></span>
+
+            </div>
+        </div>
+        <div class="form-group  row">
+
+
+            <div class="col-sm-10">
+
+                <button type="submit"  class="btn btn-primary"  style="width:auto" >创建角色</button>
+
+            </div>
+        </div>
+
+
+
+    </form>