Asp.Net Identity发现用户不在角色中

Question

我需要使用Asp.Net Identity找到所有不包含某个角色的用户.
到目前为止,我有类似的东西,但它不起作用.

(From role In context.Roles
From userRoles In role.Users
Join us In context.Users On us.Id Equals userRoles.UserId
Where role.Name <> "SomeRole"
Select us.UserName) 

这给了我一个所有用户的列表,但它包括角色"SomeRole"的用户.
它看起来我需要一些不在子查询中的类型？

这是可行的SQL代码,但如果可能的话,我仍然会喜欢LINQ查询.

select distinct A.UserName from AspNetUsers A
inner join AspNetUserRoles UR on UR.UserId = A.Id
inner join AspNetRoles R on R.Id = UR.RoleId
where not exists(
    select AspNetUserRoles UR1 on UR1.UserId = A.Id
    inner join AspNetRoles R1 on R1.Id = UR1.RoleId 
    where R1.Name = 'SomeRole')

嗯,我有一个有效的解决方案,但它不漂亮,我相信它可以写得更好.

(From role In context.Roles
From userRole In role.Users
Join user In context.Users On us.Id Equals userRole.UserId
Where Not (
    From role1 In context.Roles
    From userRole1 In role1.Users
    Join user1 In context.Users On user1.Id Equals userRoles1.UserId
    Where role1.Name = "SomeRole"
    Select user1.Id).Contains(user.Id)
Select user.UserName).Distinct()

Answer 1

在c#中,您可以获得不属于某个角色的所有用户:

var role = context.Roles.SingleOrDefault(m => m.Name == "role");
var usersNotInRole = context.Users.Where(m => m.Roles.All(r => r.RoleId != role.Id));