TransactionalCommandHandlerDecorator.cs

    /// <summary>
    /// Decorator that applies save changes after a command is successfully run
    /// </summary>
    /// <typeparam name="TCommand"></typeparam>
    public class TransactionalCommandHandlerDecorator<TCommand> : ICommandHandler<TCommand> where TCommand : CommandBase
    {
        private readonly IDbContext  _context;
        private readonly ICommandHandler<TCommand> _decoratedCommandHandler;

        public TransactionalCommandHandlerDecorator(IDbContext context, ICommandHandler<TCommand> decoratedCommandHandler)
        {
            _context = context;
            _decoratedCommandHandler = decoratedCommandHandler;
        }

        public void Handle(TCommand command)
        {
            using (var transaction = _context.Database.BeginTransaction(IsolationLevel.ReadCommitted))
            {
                try
                {
                    _decoratedCommandHandler.Handle(command);
                    _context.SaveChanges();
                    transaction.Commit();
                }
                catch (Exception)
                {
                    transaction.Rollback();
                    throw;
                }
            }
        }
    }