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）

你可以使用Entity Framework，但是使用ASP.NET Identity 1.0还不可能。你必须等待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;
}

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这是新的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);
    }
}

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最简单的方法让用户在任何角色

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

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这应该适用于.net core 5和更高版本。
第一个月

我没有看到一个内置的方式，但它是相当容易实现。我有这个方法在我的应用程序特定的UserManager：

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

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它输出的SQL似乎是合理的：

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)
)

型

出于某种原因，@ChoptimusPrime上面建议的非常好的查询在ASP.NET Identity 2.2.1中没有编译。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;
}

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例如，如果您希望用户列表具有角色“User”

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();

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