Question

我很难尝试获得此输出

Id | Name   | Role
----------------------------
1  | John   | Administrator
----------------------------
2  | Mary   | Manager
----------------------------
3  | Sage   | Editor
----------------------------
4  | Hank   | Manager

我可以在LINQPad中使用它，但不知何故我无法将其转换为ASP.NET MVC。

from u in Users
from ur in u.Roles
join r in Roles on ur.RoleId equals r.Id
select new {
    Id = u.Id,
    Name = u.Name,
    Role = r.Name,
}

如何使用Identity在ASP.NET MVC 5中LINQ呢？

为了清楚起见，我正在寻找用户和角色之间的JOIN查询。

Answer 1

如果您使用的是ASP.NET Identity 2，则必须向AccountContoller添加一些代码。添加ActionResult即可获得UserList。您还需要ApplicationDbContext个实例并从OwinContext获取它：

public class AccountController : Controller
{
    private ApplicationUserManager _userManager;
    private ApplicationSignInManager _signInManager;

    public AccountController(ApplicationUserManager userManager, ApplicationSignInManager signInManager)
    {
        UserManager = userManager;
        SignInManager = signInManager;
    }

    public ActionResult UserList()
    {
        var applicationDbContext = HttpContext.GetOwinContext().Get<ApplicationDbContext>();
        var users = from u in applicationDbContext.Users
                    from ur in u.Roles
                    join r in ApplicationDbContext.Roles on ur.RoleId equals r.Id
                    select new
                    {
                        u.Id,
                        Name = u.UserName,
                        Role = r.Name,
                    };

            // users is anonymous type, map it to a Model 
            return View(users);
    }
    .
    .
    .
}

更新 - 如果用户有多个角色：

from user in applicationDbContext.Users
select new
{
    user.Id,
    user.UserName,
    Roles = applicationDbContext.Roles.Where(r => user.Roles.Select(ur => ur.RoleId).Contains(r.Id)).Select(r => r.Name)
}

Answer 2

这将为您提供帮助

curl: (6) Could not resolve host: application; Name or service not known}

获取在Identity 2中具有指定角色的用户列表

2 个答案: