Author: Aabir

Data seeding for Identity user tables are different. Here is an example code how to seed data without extending the Identity User table. First step to create a class in Data folder Name it “ApplicationDbInitializer.cs”, following code will be in this class.

using Microsoft.AspNetCore.Identity;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace AppName.Data
{
    public class ApplicationDbInitializer
    {
        public static void SeedUsers(UserManager<IdentityUser> userManager, RoleManager<IdentityRole> roleManager)
        {
            string admin = "Admin";
            string normalUser = "NormalUser";
            string password = "p@55w0rD"; 

            if (roleManager.FindByNameAsync("Admin").Result == null)
            {
                IdentityRole role = new IdentityRole
                {
                    Name = admin,
                    NormalizedName = "ADMIN"
                };

                roleManager.CreateAsync(role).Wait();
            }

            if (roleManager.FindByNameAsync("NormalUser").Result == null)
            {
                IdentityRole role1 = new IdentityRole
                {
                    Name = normalUser,
                    NormalizedName = "NORMALUSER"
                };

                roleManager.CreateAsync(role1).Wait();                
            }

            if (userManager.FindByEmailAsync("admin@domain.com").Result == null)
            {
                IdentityUser user = new IdentityUser
                {
                    UserName = "admin@domain.com",
                    Email = "admin@domain.com"
                };

                IdentityResult result = userManager.CreateAsync(user, password).Result;

                if (result.Succeeded)
                {
                    userManager.AddToRoleAsync(user, admin).Wait();
                }
            }
        }
    }
}

Second step, call above class from Startup.cs file Configure method. Add this line at bottom of the Configure method.

ApplicationDbInitializer.SeedUsers(userManager, roleManager);

Add dependency injection in Configure method arguments like the code below

public void Configure(IApplicationBuilder app, IWebHostEnvironment env, UserManager<IdentityUser> userManager, RoleManager<IdentityRole> roleManager)

Add these two string “UserManager userManager, RoleManager roleManager” in Configure method argument.

In the Startup.cs file need to update ConfigureServices method, create a new service for Identity. Add the following code in ConfigureServices method –

services.AddDefaultIdentity<IdentityUser>().AddRoles<IdentityRole>().AddEntityFrameworkStores<AppDbContext>();

Once you run the application, it should create a user, role and assign the user in role in Identity User table.

Happy Coding 🙂