telegram-bot/Core/Extensions/RepositoryExtension.cs

using System.Threading.Tasks;
using Kruzya.TelegramBot.Core.Data;
using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Infrastructure;

namespace Kruzya.TelegramBot.Core.Extensions
{
    public static partial class RepositoryExtension
    {
        public static TEntity Create<TEntity>(this DbSet<TEntity> repository) where TEntity : class, new()
        {
            var entity = new TEntity();
            repository.Add(entity);

            return entity;
        }
    }
}