使用 Identity 内置的 RoleManager 创建角色。

步骤

  1. 创建 CreateRoleViewModel ```csharp using System.ComponentModel.DataAnnotations;

namespace StudentManagement.ViewModels { public class CreateRoleViewModel { [Required] [Display(Name = “角色”)] public string RoleName { get; set; } } }

  2. 2. 创建 AdminController 并完善 CreateRole 方法
  3. ```csharp
  4. using System.Threading.Tasks;
  5. using Microsoft.AspNetCore.Identity;
  6. using Microsoft.AspNetCore.Mvc;
  7. using StudentManagement.ViewModels;
  9. namespace StudentManagement.Controllers
  10. {
  11.     public class AdminController : Controller
  12.     {
  13.         private readonly RoleManager<IdentityRole> _roleManager;
  15.         public AdminController(RoleManager<IdentityRole> roleManager)
  16.         {
  17.             _roleManager = roleManager;
  18.         }
  20.         [HttpGet]
  21.         public IActionResult CreateRole()
  22.         {
  23.             return View();
  24.         }
  26.         [HttpPost]
  27.         public async Task<IActionResult> CreateRole(CreateRoleViewModel model)
  28.         {
  29.             if (ModelState.IsValid)
  30.             {
  31.                 var identityRole = new IdentityRole
  32.                 {
  33.                     Name = model.RoleName
  34.                 };
  36.                 // 如果尝试创建重名角色，会收到验证错误
  37.                 IdentityResult result = await _roleManager.CreateAsync(identityRole);
  39.                 if (result.Succeeded)
  40.                 {
  41.                     return RedirectToAction("Index", "Home");
  42.                 }
  44.                 foreach (var error in result.Errors)
  45.                 {
  46.                     ModelState.AddModelError("", error.Description);
  47.                 }
  48.             }
  50.             return View(model);
  51.         }
  52.     }
  53. }
  1. 创建 CreateRole 视图 ```csharp @model CreateRoleViewModel

@{ ViewBag.Title = “创建角色”; }

```