Is it possible to create some pre-register users when migrate to authentication DB in ASP.NET/Blazor-CodePudding

I wonder if it's possible to add users and passwords without have to register them with a form. I have an existing DB with some users and passwords and I want to transfer it to aspNetUser.

I migrated these default tables into local DB and I don't understand how to set about 10 existing users with only passwords in these tables.

I only want to "paste" in users and passwords.

I'm using Blazor server template with individual authentication enable.

CodePudding user response：

Yes, you can do that but manually as a seed to your database.
You can do something like that:

public class AppIdentityDbContextSeed
    {
        public static async Task SeedAsync(UserManager<IdentityUser> userManager, RoleManager<IdentityRole> roleManager)
        {
            await roleManager.CreateAsync(new IdentityRole("Administrators"));

            var defaultUser = new IdentityUser { UserName = "your username", Email = "your email" };
            await userManager.CreateAsync(defaultUser, "your password");

            string adminUserName = "Your admin name";
            var adminUser = new IdentityUser { UserName = adminUserName, Email = "your admin email" };
            await userManager.CreateAsync(adminUser, "your admin password");
            adminUser = await userManager.FindByNameAsync(adminUserName);
            await userManager.AddToRoleAsync(adminUser, "Administrators");
        }
    }

Then you can use SeedAsync method in your program class as below:

public class Program
    {
        public static async Task Main(string[] args)
        {
            var host = CreateHostBuilder(args)
                        .Build();

            using (var scope = host.Services.CreateScope())
            {
                var services = scope.ServiceProvider;
                try
                {
                    
                    var userManager = services.GetRequiredService<UserManager<IdentityUser>>();
                    var roleManager = services.GetRequiredService<RoleManager<IdentityRole>>();
                    await AppIdentityDbContextSeed.SeedAsync(userManager, roleManager);
                }
                catch (Exception ex)
                {
                    //exception handling
                }
            }

            host.Run();
        }

        public static IHostBuilder CreateHostBuilder(string[] args) =>
            Host.CreateDefaultBuilder(args)
                .ConfigureWebHostDefaults(webBuilder =>
                {
                    webBuilder.UseStartup<Startup>();
                });
    }

Finally check Startup.cs, it should be as below:

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