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OdbcDataReader.GetOrdinal Method

Gets the column ordinal, given the name of the column.

Namespace:  System.Data.Odbc
Assembly:  System.Data (in System.Data.dll)

public override int GetOrdinal(
	string value
)

Parameters

value
Type: System.String

The name of the column.

Return Value

Type: System.Int32
The zero-based column ordinal.

Implements

IDataRecord.GetOrdinal(String)

GetOrdinal performs a case-sensitive lookup first. If it fails, a second case-insensitive search is made. The method throws an IndexOutOfRange exception if the zero-based column ordinal is not found.

GetOrdinal is kana-width insensitive.

Because ordinal-based lookups are more efficient than named lookups, it is inefficient to call GetOrdinal within a loop. Instead, call GetOrdinal one time and then assign the results to an integer variable for use within the loop.

The following example demonstrates how to use the GetOrdinal method.

public static void ReadData(string connectionString)
{
    string queryString = "SELECT DISTINCT CustomerID FROM Orders";

    using (OdbcConnection connection = new OdbcConnection(connectionString))
    {
        OdbcCommand command = new OdbcCommand(queryString, connection);

        connection.Open();
        OdbcDataReader reader = command.ExecuteReader();

        int customerID = reader.GetOrdinal("CustomerID");

        while (reader.Read())
        {
            Console.WriteLine("CustomerID={0}", reader.GetString(customerID));
        }

        // Call Close when done reading.
        reader.Close();
    }
}

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1
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