IM_NEW/User.Domain/IdDomainService.cs

using IdentityService.Domain.Entities;
using IM.Commons;
using Microsoft.AspNetCore.Identity;

namespace IdentityService.Domain
{
    public class IdDomainService
    {
        private readonly IIdRepository idRepository;
        public IdDomainService(IIdRepository idRepository)
        {
            this.idRepository = idRepository;
        }

        public async Task<Result<User?>> CreateUserAsync(string userName, string password, string nickName)
        {
            SignInResult checkUsername = await idRepository.CheckUsernameAsync(userName);
            if (!checkUsername.Succeeded)
            {
                return Result<User?>.Fail(ResultCode.USER_ALREADY_EXISTS);
            }
            return Result<User?>.Success(new User(userName, nickName));
        }

    }
}