Question

我正在尝试建立一个多选的管理员用户，以便在已分配或未分配之间切换。一切似乎都是正确的，除非它不喜欢我试图将{或1}}的{{1}}属性赋予真或假的地方。

错误是：

运营商＆＃39; ==＆＃39;不能应用于＆＃39; string＆＃39;类型的操作数和＆＃39; System.Linq.IQueryable＆＃39;

感谢任何帮助！

IsInRole

Answer 1

在您的情况下，您正在两次前往db，一次获取Admin RoleId，第二次获取AdminRole = Yes / Now

这只是一次访问db而不是你的情况下的两次查询。

var adminUsers = db.Roles.Where(r => r.Name == "Administrator")
                         .SelectMany(r => r.Users.Select(u => new UsersInRoleViewModel 
                                             {
                                                 UserId = u.Id,
                                                 DisplayName = u.DisplayName)).toList();

var users = db.Users.Select(u=> new UsersInRoleViewModel 
                                {
                                   UserId = u.Id,
                                   DisplayName = u.DisplayName)).toList();

var adminMultiSelect = new MultiSelectList(users, "Id", "DisplayName", adminUsers);

var model = new UserSelectListsViewModel { AdminUsers = adminMultiSelect, SelectedAdmins = adminUsers, DevUsers = null, PMUsers = null, SubUsers = null };

Answer 2

管理员ID是ID列表。您需要将其更改为

var adminId = db.Roles.Where（r =＆gt; r.Name ==＆＃34; Administrator＆＃34;）。选择（r =＆gt; r.Id）.First（）。ToString（）;

 public ActionResult EditRoles()
        {
            //AdminUsers

            var adminId = db.Roles.Where(r => r.Name == "Administrator").Select(r => r.Id).First().ToString();

            var users = db.Users.Select(u => new UsersInRoleViewModel 
                                                    {
                                                        UserId = u.Id,
                                                        DisplayName = u.DisplayName, 
                                                        IsInRole = u.Roles.Where(r => adminId == r.RoleId))
                                                    });

            var adminUsers = users.Where(u => u.IsInRole).Select(n => n.UserId).ToArray();

            var adminMultiSelect = new MultiSelectList(users, "Id", "DisplayName", adminUsers);

            var model = new UserSelectListsViewModel { AdminUsers = adminMultiSelect, SelectedAdmins = adminUsers, DevUsers = null, PMUsers = null, SubUsers = null };

            return View(model);
        }

转换IQueryable字符串以与字符串

2 个答案: