Question

Suppose I want to inherit from System.Data.SqlClient.SqlTransaction which is sealed. Supose I want to just put a wrapper around SqlTransaction and always use MyTransaction instead of SqlTransaction. Is there a way I could potentially cast MyTransaction to SqlTransaction using an Implicit/Widening operator?

Answer 1

If you really want implicit conversion (although I would not recommend it, as it is a horrible idea and a horrible design, IMO), you can do something like this:

    class MyTransaction
    {
        private readonly SqlTransaction _transaction;

        public MyTransaction(SqlConnection conn)
        {
            _transaction = conn.BeginTransaction();
        }

        public SqlTransaction Transaction
        {
            get
            {
                return _transaction;
            }
        }

        public static implicit operator SqlTransaction(MyTransaction t)
        {
            return t.Transaction;
        }
    }