You can access the same column information about the results of a query that you can for table schemas. See Columns for the columns returned.

Retrieving Result Set Metadata

You can use the GetSchemaTable method of the APIDataReader to retrieve result set metadata. Call GetSchemaTable after calling ExecuteReader.

Each row of the DataTable describes a column in the query's result.

C#

string connectionString = "Profile=<Path to Profile>;ProfileSettings=<Profile Configuration Settings>";

using (APIConnection conn = new APIConnection(connectionString)) {
  APICommand cmd = new APICommand("SELECT * FROM NorthwindOData WHERE Email = '[email protected]'", conn);
  APIDataReader rdr = cmd.ExecuteReader();
  DataTable schemaTable = rdr.GetSchemaTable();
  foreach (DataRow row in schemaTable.Rows) {
    foreach (DataColumn col in schemaTable.Columns) {
      Console.WriteLine("{0}: {1}", col.ColumnName, row[col]);
    }
  }
}

VB.NET

Dim connectionString As String = "Profile=<Path to Profile>;ProfileSettings=<Profile Configuration Settings>"

Using conn As New APIConnection(connectionString)
  Dim cmd As New APICommand("SELECT * FROM NorthwindOData WHERE Email = '[email protected]'", conn)
  Dim rdr As APIDataReader = cmd.ExecuteReader()
  Dim schemaTable As DataTable = rdr.GetSchemaTable()
  For Each row As DataRow In schemaTable.Rows
    For Each col As DataColumn In schemaTable.Columns
      Console.WriteLine("{0}: {1}", col.ColumnName, row(col))
    Next
  Next
End Using