如何在Visual C＃中使用DataReader处理多个结果？

Question

I have a stored procedure which returns two tables. Table 1 has for example {1,2,3,4,5}, the table 2 will have have {a,b,c,d,e}. For example {1,a}, {2,b} similarly all are related.

In my reader, I have to read all these data into a List. Object will have have two properties where {1,a} go. This is the code I have now,

while(reader.Read())
        {
            Transaction transaction = null;
            transactions.Add(transaction = new Transaction()
            {
                TranID = reader.GetInt64(reader.GetOrdinal("TranID"))
            });

            if (reader.NextResult())
            {
                while (reader.Read())
                {
                    transaction.Amounts.Add(new Fund
                    {
                        Amount = reader.GetDecimal(reader.GetOrdinal("Amount")),
                    });
                }
            }
        }

What's happening here is if I return 10 Transaction Ids and 10 Amounts, my final result has only 1 Transaction and 10 Amounts mapped to it. How do I get 10 Transactions with equivalent Amount?

Answer 1

You can not access multiple resultsets this way from SqlDataReader. You can access all the rows from one resultset at a time. If you move to the nextresult set, you can not go back to the previous result set.

Following is the sample code of how you retrieve data from multiple resultsets of SqlDataReader.

while (reader.Read())
{
     Console.WriteLine(reader.GetString(0));
}

if (reader.NextResult())
{
    while (reader.Read())
    {
        Console.WriteLine(reader.GetString(0));
    }
}