UserRoles 身份表关系

image.png

步骤

  1. 编写用于增删用户的 ViewModel

    1. public class UserRoleViewModel
    2. {
    3.  public string UserId { get; set; }
    5.  public string UserName { get; set; }
    7.  public bool IsSelected { get; set; }
    8. }

  2. 在 EditRole 页面增加一个导向 EditUsersInRole 的链接

    1. <a class="btn btn-outline-primary" style="width: auto" asp-action="EditUsersInRole" asp-controller="Admin" asp-route-roleid="@Model.Id">从角色中添加或删除用户</a>

  3. 跳转到 EditUsersInRole 时，将所有用户的信息传递过来

    1. [HttpGet]
    2. public async Task<IActionResult> EditUsersInRole(string roleId)
    3. {
    4.  ViewBag.roleId = roleId;
    6.  var role = await _roleManager.FindByIdAsync(roleId);
    8.  if (role == null)
    9.  {
    10.      ViewBag.ErrorMessage = $"角色 ID 为 {roleId} 的角色不存在";
    11.      return View("NotFound");
    12.  }
    14.  var model = new List<UserRoleViewModel>();
    16.  foreach (var user in _userManager.Users)
    17.  {
    18.      var userRoleViewModel = new UserRoleViewModel
    19.      {
    20.          UserId = user.Id,
    21.          UserName = user.UserName,
    22.          IsSelected = await _userManager.IsInRoleAsync(user, role.Name)
    23.      };
    25.      model.Add(userRoleViewModel);
    26.  }
    28.  return View(model);
    29. }

  4. 编写 EditUsersInRole 视图 ```html @model List

@{ ViewBag.Title = “在此角色中添加或删除用户”; var roleId = ViewBag.roleId; }

在此角色中添加或删除用户

@for (var i = 0; i < Model.Count; i++) {
}
取消 

  2. 注：此处推荐使用 for 而不是 foreach，直接用 foreach 生成的 checkbox 的 name 有问题。<br />![image.png](https://cdn.nlark.com/yuque/0/2020/png/101969/1585009517576-4373bcdd-1d61-4293-b9b6-77dabf121f87.png#align=left&display=inline&height=349&margin=%5Bobject%20Object%5D&name=image.png&originHeight=349&originWidth=1212&size=71876&status=done&style=none&width=1212)
  4. 5. 编写更新角色用户的 Post 方法
  5. ```csharp
  6. [HttpPost]
  7. public async Task<IActionResult> EditUsersInRole(List<UserRoleViewModel> model, string roleId)
  8. {
  9.     var role = await _roleManager.FindByIdAsync(roleId);
  11.     if (role == null)
  12.     {
  13.         ViewBag.ErrorMessage = $"角色 ID 为 {roleId} 的角色不存在";
  14.         return View("NotFound");
  15.     }
  17.     for (var i = 0; i < model.Count; i++)
  18.     {
  19.         var userRoleVM = model[i];
  20.         var user = await _userManager.FindByIdAsync(userRoleVM.UserId);
  22.         // 判断当前用户是否已属于该角色且被选中
  23.         // 不属于的话，要添加进来；没有选中的话要移除出来
  25.         var isInRole = await _userManager.IsInRoleAsync(user, role.Name);
  27.         IdentityResult result;
  29.         // 被选中，但尚不属于该角色
  30.         if (userRoleVM.IsSelected && !isInRole)
  31.         {
  32.             result = await _userManager.AddToRoleAsync(user, role.Name);
  33.         }
  34.         // 本来属于该角色，但未被选中
  35.         else if (!userRoleVM.IsSelected && isInRole)
  36.         {
  37.             result = await _userManager.RemoveFromRoleAsync(user, role.Name);
  38.         }
  39.         else continue;
  41.         if (result.Succeeded)
  42.         {
  43.             if (i < model.Count - 1) continue;
  45.             return RedirectToAction("EditRole", new { id = roleId });
  46.         }
  47.     }
  49.     return RedirectToAction("EditRole", new { id = roleId });
  50. }