using System;

using System.Threading;

using System.Threading.Tasks;

​

    public interface IDbContext {

      void Commit();

      void Rollback();   

    } 

​

    public interface IUnitOfWork<T> where T: IDbContext

    {

       T DbContext { get;  }

    }

    public interface IAsyncUnitOfWork: IUnitOfWork<IDbContext> 

    { 

        Task CommitAsync(CancellationToken cancellationToken);

        Task BeginTransactionAsync(CancellationToken cancellationToken);

    }

​

    public abstract class AbstractUnitOfWork: IAsyncUnitOfWork 

    {

      public abstract IDbContext DbContext {get; set; }

      public AbstractUnitOfWork(IDbContext context)

      {

        DbContext = context;

      }

      public abstract Task BeginTransactionAsync(CancellationToken cancellationToken);

      public abstract Task CommitAsync(CancellationToken cancellationToken);

    }

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

    }

}