获取角色中的所有用户。 ASP.NET身份

Question

I can get all users like this

var users = UserManager.Users.ToList();

I can find a role like this

var role = db.Roles.SingleOrDefault(m => m.Name == "User");

I want to list all users with the role name "User" in the AspNetRoles table (I have User and Admin ).

var role = db.Roles.SingleOrDefault(m => m.Name == "User");
var usersInRole = db.Users.Where(m => m.Roles.Any(r => r.RoleId == role.Id)).ToList();

return View(usersInRole);

I get the role in var role but userInRole gives me Count = 0 when I debug. No compile errors.

Answer 1

You can use bellow code for retrieve all users in specific role (Identity 2.xx):

var users = await _userManager.GetUsersInRoleAsync("RoleName");

or for synchronize usage:

var users = _userManager.GetUsersInRoleAsync("RoleName").Result;

Answer 2

var usersInRole = db.Users.Where(m => m.Roles.RoleId == role.Id)).ToList();

您搜索所有用户并返回符合特定角色ID的用户

Answer 3

Have you tried to use navigation properties Lazy Loading ?

var role = db.Roles.SingleOrDefault(m => m.Name == "User");
var usersInRole = role.Users;

Answer 4

you can use Linq expression base query like below :

var roleUserIdsQuery=from role in db.Roles 
                where role.Name=="User"
                from user in role.Users
                select user.UserId;
var users=db.Users.Where(u=>roleUserIdsQuery.Contains(u.Id)).ToList();