How to call interface's method at runtime using program.cs (.NET 6 preview 7)

Question

Hi, I'm trying to call method in interface class in program.cs but it seem to be ignored.
void Init(IDefaultAccountInit init)
{
init.Initialize();
}

Answer 1

Hi @Khanh Duy Van Ba ,

From your code and description, I assume you want to call the method in the interface class to seed data for the Identity table, right? If that is the case, you can refer the following sample:

Interface and the Initialize method:

public interface IDataRepository  
{  
    public void Initialize(ApplicationDbContext db, UserManager<IdentityUser> userManager);  
}  

public class DataRepository : IDataRepository  
{  
      
    public void Initialize(ApplicationDbContext db, UserManager<IdentityUser> _userManager)  
    {  
        var user = _userManager.Users.ToList();  
        //you can seed the Identity User table from here.  
    }  
}  

Register the service in the ConfigureServices method: (I didn't configure the Role Manager, you can set it in your application)

    services.AddDbContext<ApplicationDbContext>(options =>  
        options.UseSqlServer(  
            Configuration.GetConnectionString("DefaultConnection")));  
    services.AddDatabaseDeveloperPageExceptionFilter();  

    services.AddDefaultIdentity<IdentityUser>(options => options.SignIn.RequireConfirmedAccount = true)  
        .AddEntityFrameworkStores<ApplicationDbContext>();  

    services.AddScoped<IDataRepository, DataRepository>();  

Then, in the program.cs file, use the GetRequiredService() method to get the relate service:

    public static void Main(string[] args)  
    {  
        var host = CreateHostBuilder(args).Build();  

        //required using Microsoft.Extensions.DependencyInjection;  
        // required using Microsoft.AspNetCore.Identity;  
        using (var scope = host.Services.CreateScope())  
        {  
            var services = scope.ServiceProvider;  
            try  
            {  
                var dbcontext = services.GetRequiredService<ApplicationDbContext>();  
                var userManager = services.GetRequiredService<UserManager<IdentityUser>>();  
                var repository = services.GetRequiredService<IDataRepository>();  

                repository.Initialize(dbcontext, userManager);  
            }  
            catch (Exception ex)  
            {  
                var logger = services.GetRequiredService<ILogger<Program>>();  
                logger.LogError(ex, "An error occurred while seeding the database.");  
            }  
        }   
        host.Run();  
    }  

The result as below:

Besides, you can also refer the following article to initialize data into database:

Initialize DB with test data

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Best regards,
Dillion

Answer 2

I see - what should be calling your Init method?

Answer 3

When you say ignored do you mean that your Init method is called, but init.Initialize isn't?