问题
I have a drop down list box which lists roles. I want to get the list of users having that role. I mean list of users that are in "Administrator" role or "CanEdit" role. Here is my code:
public IQueryable<Microsoft.AspNet.Identity.EntityFramework.IdentityUser>
GetRolesToUsers([Control] string ddlRole)
{
//ddlRole returns role Id, based on this Id I want to list users
var _db = new ApplicationDbContext();
IQueryable<Microsoft.AspNet.Identity.EntityFramework.IdentityUser> query = _db.Users;
if (ddlRole != null)
{
//query = query.Where(e => e.Claims == ddlRole.Value); ???????
}
return query;
}
Please help.
Updated Code (still error)
public List<IdentityUserRole> GetRolesToUsers([Control]string ddlRole)
{
var roleManager =
new RoleManager<IdentityRole>(new RoleStore<IdentityRole>(new ApplicationDbContext()));
var users = roleManager.FindByName("Administrator").Users.ToList();
return users;
}
Error: The Select Method must return one of "IQueryable" or "IEnumerable" or "Microsoft.AspNet.Identity.EntityFramework.IdentityUser" when ItemType is set to "Microsoft.AspNet.Identity.EntityFramework.IdentityUser".
I tried various castings but none of them helped.
UPDATE (working solution)
Thanks to chris544, his idea helped me to fix this. Here is working method:-
public List<ApplicationUser> GetRolesToUsers([Control]string ddlRole)
{
var context = new ApplicationDbContext();
var users =
context.Users.Where(x => x.Roles.Select(y => y.RoleId).Contains(ddlRole)).ToList();
return users;
}
回答1:
Not an expert, but ...
There seemed to be no built in funcionality for this in Identity and I could not get it work from built in Roles also (it seems to not work with claims based Identity).
So I ended up doing something like this:
var users = context.Users
.Where(x => x.Roles.Select(y => y.Id).Contains(roleId))
.ToList();
x.Roles.Select(y => y.Id)gets a list of all role ids foruser x.Contains(roleId)checks if this list of ids contains necessaryroleId
回答2:
I find the role by the role name input. After, I find list users by id of the role.
public List<ApplicationUser> GetUsersInRole(string roleName)
{
var roleManager =
new RoleManager<IdentityRole>(new RoleStore<IdentityRole>(new ApplicationDbContext()));
var role = roleManager.FindByName(roleName).Users.First();
var usersInRole =
Users.Where(u => u.Roles.Select(r => r.RoleId).Contains(role.RoleId)).ToList();
return usersInRole;
}
回答3:
If you want to avoid using the context directly you can use the RoleManager with the following snippet
roleManager.FindByName("Administrator").Users
or
roleManager.FindByName("CanEdit").Users
For a short discussion about this topic have a look at the this thread
回答4:
There are three ways you can do it.
In the Controller current logged in user's role can be checked as follows,
if(User.IsInRole("SysAdmin"))
{
Outside Controller you can check whether a particular user belongs to a Role as follows:
ApplicationUserManager UserManager = HttpContext.GetOwinContext().GetUserManager<ApplicationUserManager>();
var roles = UserManager.GetRoles(userid);
if (roles.Contains("SysAdmin"))
{
}
Do not forget to add namespace,
using Microsoft.AspNet.Identity.EntityFramework;
using Microsoft.AspNet.Identity;
using Microsoft.AspNet.Identity.Owin;
For some reasons like integration testing etc, you may directly want to use EF to find user's role as follows:
string userId = User.Identity.GetUserId();
ApplicationDbContext db = new ApplicationDbContext();
var role = (from r in db.Roles where r.Name.Contains("Admin") select r).FirstOrDefault();
var users = db.Users.Where(x => x.Roles.Select(y => y.RoleId).Contains(role.Id)).ToList();
if (users.Find(x => x.Id == userId) != null)
{
// User is in the Admin Role
}
Hope it helps.
Thanks /dj @debug_mode
回答5:
Using the RoleManager gives you this solution:
if(roleManager.RoleExists("CanEdit"))
{
var idsWithPermission = roleManager.FindByName("CanEdit").Users.Select(iur => iur.Id);
var users = db.Users.Where(u => idsWithPermission.Contains(u.Id));
}
I'd be interested to hear if this was better or worse than the other solutions here.
回答6:
the code working for me was as following:
var users = roleManager.FindByName(roleName).Users.Select(x => x.UserId);
var usersInRole = Users.Where(u => users.Contains(u.Id));
回答7:
Remove the .Email and add UserName or whatever was added to the ASPNetUsers for name.
private void AddAddminToMail(MailMessage message)
{
var roles = db.Roles.Include(m => m.Users).Where(m => m.Name == "Admin").First();
foreach (var user in roles.Users)
{
var id = user.UserId;
var userEmail = db.Users.Find(id).Email;
message.To.Add(userEmail);
}
}
回答8:
Since bits like this tend to impact performance, I tried the other answers posted here and looked at the SQL they generated. This seems to be the most performant way of getting all the user's email addresses currently.
public void SendEmailToUsersInRole(string roleName)
{
MailMessage message = new MailMessage();
...
using (var usersDB = new ApplicationDbContext())
{
var roleId =
usersDB.Roles.First(x => x.Name == roleName).Id;
IQueryable<string> emailQuery =
usersDB.Users.Where(x => x.Roles.Any(y => y.RoleId == roleId))
.Select(x => x.Email);
foreach (string email in emailQuery)
{
message.Bcc.Add(new MailAddress(email));
}
}
...
}
The SQL that it executes is shown below:
SELECT TOP (1)
[Extent1].[Id] AS [Id],
[Extent1].[Name] AS [Name]
FROM [dbo].[AspNetRoles] AS [Extent1]
WHERE N'Reviewer' = [Extent1].[Name]
SELECT
[Extent1].[Email] AS [Email]
FROM [dbo].[AspNetUsers] AS [Extent1]
WHERE EXISTS (SELECT
1 AS [C1]
FROM [dbo].[AspNetUserRoles] AS [Extent2]
WHERE ([Extent1].[Id] = [Extent2].[UserId]) AND ([Extent2].[RoleId] = @p__linq__0)
)
-- p__linq__0: '3' (Type = String, Size = 4000)
来源：https://stackoverflow.com/questions/23824397/get-list-of-users-with-assigned-roles-in-asp-net-identity-2-0