Asp.Net core MVC6 How to initially add roles in Identity 3

Question

I\'ve looked for this in Stackoverflow and so far it appears there are plenty of questions on adding roles in Identity 1 & 2 but its different in Identity 3.

I w

Answer 1

public class SeedData
{
    private const string _adminRoleName = "admin";
    private string _adminEmail = "admin@demo.com";
    private string _adminPassword = "P@ssw0rd!PK";

    private string[] _roles = new string[] { _adminRoleName, "supervisor" };

    private readonly RoleManager> _roleManager;
    private readonly UserManager _userManager;

    public  static async Task Run(IServiceProvider serviceProvider)
    {
        using (var serviceScope =serviceProvider
                                 .GetRequiredService()
                                 .CreateScope())
        {
            var instance = serviceScope.ServiceProvider.GetService();
            await instance.Initialize();

            var context = serviceScope.ServiceProvider.GetService();
            if (!context.Products.Any())
            {
               // Seed Other entities Here
            }

            await context.SaveChangesAsync();
        }
    }

    public SeedData(UserManager userManager, 
                                  RoleManager> roleManager)
    {
        _roleManager = roleManager;
        _userManager = userManager;
    }

    public async Task Initialize()
    {
        foreach (var role in _roles)
        {
            if (!await _roleManager.RoleExistsAsync(role))
            {
                await _roleManager.CreateAsync(new IdentityRole(role));
            }
        }

        var adminUsers = await _userManager.GetUsersInRoleAsync(_adminRoleName);
        if (!adminUsers.Any())
        {
            var adminUser = new ApplicationUser()
            {
                Id = Guid.NewGuid(),
                Email = _adminEmail,
                UserName = _adminEmail
            };

            var result = await _userManager.CreateAsync(adminUser, _adminPassword);
            if(result.Success)
            {
               await _userManager.AddToRoleAsync(adminUser, _adminRoleName);
            }
       }         
   }
}

In your Program.cs

public static void Main(string[] args)
{
     var host = BuildWebHost(args);

     using (var scope = host.Services.CreateScope())
     {
         var services = scope.ServiceProvider;
         try
         {
              SeedData.Run(services).Wait();
         }
         catch (Exception ex)
         {
             var logger = services.GetRequiredService>();
             logger.LogError(ex, "Error while seeding database.");
         }
     }

      host.Run();
  }

Might be helpful to someone :)