ASP.NET Identity：获取角色中的所有用户

Question

如何获取某个角色的所有用户列表？之前可以使用 Roles.GetUsersInRole，但是使用新的 Identity 我找不到这样的东西。

Answer 1

我没有看到内置的方法，但它相当容易实现。我在我的应用程序特定的 UserManager 中有这个方法：

public IQueryable<User> GetUsersInRole(string roleName)
{
    return from user in Users
           where user.Roles.Any(r => r.Role.Name == roleName)
           select user;
}

它输出的 SQL 看起来很合理：

SELECT 
[Extent1].[Id] AS [Id], 
[Extent1].[Email] AS [Email], 
[Extent1].[EmailConfirmed] AS [EmailConfirmed], 
[Extent1].[PasswordHash] AS [PasswordHash], 
[Extent1].[SecurityStamp] AS [SecurityStamp], 
[Extent1].[PhoneNumber] AS [PhoneNumber], 
[Extent1].[PhoneNumberConfirmed] AS [PhoneNumberConfirmed], 
[Extent1].[TwoFactorEnabled] AS [TwoFactorEnabled], 
[Extent1].[LockoutEndDateUtc] AS [LockoutEndDateUtc], 
[Extent1].[LockoutEnabled] AS [LockoutEnabled], 
[Extent1].[AccessFailedCount] AS [AccessFailedCount], 
[Extent1].[UserName] AS [UserName]
FROM [dbo].[AspNetUsers] AS [Extent1]
WHERE  EXISTS (SELECT 
    1 AS [C1]
    FROM  [dbo].[AspNetUserRoles] AS [Extent2]
    INNER JOIN [dbo].[AspNetRoles] AS [Extent3] ON [Extent2].[RoleId] = [Extent3].[Id]
    WHERE ([Extent1].[Id] = [Extent2].[UserId]) AND ([Extent3].[Name] = @p__linq__0)
)

Answer 2

由于某种原因，@ChoptimusPrime 上面建议的非常好的查询没有在 ASP.NET Identity 2.2.1 中为我编译。我写了一个扩展函数：

public static IQueryable<User> GetUsersInRole(DbContext db, string roleName)
{
  if (db != null && roleName != null)
  {
    var roles = db.Roles.Where(r => r.Name == roleName);
    if (roles.Any())
    {
      var roleId = roles.First().Id;
      return from user in db.Users
             where user.Roles.Any(r => r.RoleId == roleId)
             select user;
    }
  }
  return null;
}

Answer 3

例如，如果您想要角色为“用户”的用户列表

var users = await (from user in _dbContext.Users
                                 join userRole in _dbContext.UserRoles
                                 on user.Id equals userRole.UserId
                                 join role in _dbContext.Roles 
                                 on userRole.RoleId equals role.Id
                                 where role.Name == "User" 
                                 select user)
                                 .ToListAsync();

Answer 4

在 1.0 RTM 中不可能通过 RoleManager，在 1.1 中它将通过 IQueryable RoleManager.Roles 公开。对于1.0，您需要下拉到实现层（即数据库上下文）

Answer 5

您可以使用实体框架，但使用 Asp.Net Identity 1.0 尚不可能。必须等待Identity 2.0的发布。

using (SqlConnection connection = new SqlConnection(ConfigurationManager.ConnectionStrings("DefaultConnection").ConnectionString)) {
    string queryString = "SELECT AspNetUsers.UserName FROM dbo.AspNetUsers INNER JOIN dbo.AspNetUserRoles ON " + "AspNetUsers.Id=AspNetUserRoles.UserId WHERE AspNetUserRoles.RoleID='" + id + "'";
    SqlCommand command = new SqlCommand(queryString, connection);
    command.Connection.Open();

    List<string> @out = null;
    dynamic reader = command.ExecuteReader();
    while (reader.Read()) {
        if (@out == null) @out = new List<string>();
        @out.Add(reader.GetString(0));
    }

    return @out;
}

Answer 6

这是给新的

MVC 5 ASP.NET Identity

：

var managerRole = TMRoles.GetIdentityRole(TMRoles.Manager);
var managers = managerRole.Users;

public class TMRoles
{
    private static RoleManager<IdentityRole> RoleManager = 
        new RoleManager<IdentityRole>(new RoleStore<IdentityRole>(new TMContext()));

    public static string Manager { get { return "Manager"; } }


    public static IdentityRole GetIdentityRole(string roleName)
    {
        return RoleManager.FindByName(roleName);
    }
}

Answer 7

让用户担任任何角色的最简单方法

int totalUser=db.AspNetUsers.Where(u => u.AspNetRoles.Any(r => r.Name == "USER")).Count()

Answer 8

这应该适用于 .net core 5 及更高版本

var usersInRole = await new UserStore<ApplicationUser>(dbContext).GetUsersInRolesAsync("Role" );