Checking if a user is in a role in asp.net mvc Ide

问题:

I'm having an issue seeding my database with users and roles.

The User and the Role are both created (I can see them in the database after the error is thrown).

However, when I try to check if the user is in a role, I get an exception.

My code is:

    public class tbInitializer<T> : DropCreateDatabaseAlways<tbContext>
    {
    protected override void Seed(tbContext context)
    {
        ApplicationDbContext userscontext = new ApplicationDbContext();
        var userStore = new UserStore<ApplicationUser>(userscontext);
        var userManager = new UserManager<ApplicationUser>(userStore);

        var roleStore = new RoleStore<IdentityRole>(userscontext);
        var roleManager = new RoleManager<IdentityRole>(roleStore);


        if(!userscontext.Users.Any(x=> x.UserName=="marktest"))
        {
            var user = new ApplicationUser { UserName = "marktest", Email = "[e-mail]" };
            userManager.Create(user, "Pa$$W0rD!");
        }

        if (!roleManager.RoleExists("Admin"))
        { 
            roleManager.Create(new IdentityRole("Admin"));
        }

        if(!userManager.IsInRole("marktest","Admin"))
        { 
            userManager.AddToRole("marktest","Admin");
        }

However, on the line:

if(!userManager.IsInRole("marktest","Admin"))

An exception is thrown with the error: UserId not found.

The User and the Role are both in the database when I check after the exception is thrown:

Can anyone see what I'm doing wrong?

Thanks for any help,

Mark

回答1:

I found out the solution, in case anyone else is having this problem.

The "IsInRole" is expecting a User.Id - not a UserName string - so I changed to:

            if (!userManager.IsInRole(user.Id, "Admin"))
            {
                userManager.AddToRole(user.Id, "Admin");
            }

So the working code becomes:

    ApplicationDbContext userscontext = new ApplicationDbContext();
    var userStore = new UserStore<ApplicationUser>(userscontext);
    var userManager = new UserManager<ApplicationUser>(userStore);

    var roleStore = new RoleStore<IdentityRole>(userscontext);
    var roleManager = new RoleManager<IdentityRole>(roleStore);

    // Create Role
    if (!roleManager.RoleExists("Admin"))
    { 
        roleManager.Create(new IdentityRole("Admin"));
    }

    if(!userscontext.Users.Any(x=> x.UserName=="marktest"))
    {
        // Create User
        var user = new ApplicationUser { UserName = "marktest", Email = "[e-mail]" };
        userManager.Create(user, "Pa$$W0rD!");

        // Add User To Role
        if (!userManager.IsInRole(user.Id, "Admin"))
            {
                userManager.AddToRole(user.Id, "Admin");
            }


    }

I hope that helps,

Mark

回答2:

Simplest thing in life;

bool isAdmin= User.IsInRole("admin")