ASP.Net MVC用户列表及其角色

Question

I'm using ASP.NET MVC Default project. In there we have a database called AspNetRoles (defines roles like Admin, User)

then there's a database called AspNetUsers which just defines Users when you register them

and the last and most important is AspNetUserRoles . When you assign Roles to the User here is where it is placed (and the Id's are hashed)

My question is, how do I get a list of every user on the system and their roles? I can't figure out how to start doing this. Should I create my own User and Role database and forget about the default one? Or is there a way of creating with the default ones?

---

Also, I would keep in mind that as of now I'm assigning Roles when registering (User by default) and later when I create the Index where I show the list of Users and Roles, I will want to edit them, but this is just a disclaimer. Thank you very much for any type of help.

Answer 1

There are no built in methods for retrieving the list of users with their roles so you can try to get the user and their role like below (using EF):

var list = context.Users        
    .Where(x => x.Roles.Select(a => a.Id))
    .ToList();

Using this you get every users and assigned roles.

Update Create a Model like below first:

public class UserRoleInfo
{
    public ApplicationUser User { set; get; }
    public List<string> Roles { set; get; } 
}

Then Your Query would be like (Query Syntax):

var listOfUsers = (from u in db.Users
             let query = (from ur in db.Set<IdentityUserRole>()
                          where ur.UserId.Equals(u.Id)
                          join r in db.Roles on ur.RoleId equals r.Id select r.Name)
                          select new UserRoleInfo() {User = u, Roles = query.ToList<string>()})
                         .ToList();

Query above will return Every User With their Roles no matter how many.

UPDATE

Your view would be like:

@model UserRoleInfo
    <table>
        <tbody>
@foreach (var user in Model)
{
    var appUser = user.ApplicationUser;
    var roles = user.Roles;

            <tr>
                <td>
                    @appUser.Email
                </td>
                <td>
                    @string.Join(",", roles)
                </td>
            </tr>

}
        </tbody>
    </table>

Answer 2

I would suggest going this way since this will return all users from database as a list with their respective roles attached in the user object. Furthermore it uses eagerly loading on Roles entity, so it will be converted to a join in database.

If you want to take only one user and its roles where is just a where condition to add and filter by its id.

var users = _applicationDbContext.Users.Include(x => x.Roles).ToList();
foreach (var applicationUser in users)
{
    var userRoles = applicationUser.Roles;
    //Do something with this user roles
}

Answer 3

to get a list of every user on the system and their roles:

SELECT        UserRoleId, UserId, RoleId, dbo.GetRoleName(RoleId) AS RoleName
FROM            dbo.UserRoles

Function : dbo.GetRoleName -

function [dbo].[GetRoleName](@input int)
Returns Nvarchar(500)
As
Begin
Declare @RoleName nvarchar(500)
Set @RoleName=(select Name from Roles where RoleId=@input)
return @RoleName
End