NextResultAsync(CancellationToken)

This method returns a Task-based asynchronous version of OracleDataReader.NextResult().

Declaration

// C#
public Task<bool> NextResultAsync(CancellationToken cancellationToken);

Parameter

cancellationToken - The input cancellation token which can be used by the application to cancel the task before command timeout occurs.

Return Value

Task<bool> object representing the asynchronous operation immediately without blocking the calling thread for the whole duration of the query execution

Implements

DbDataReader

Exceptions

InvalidOperationException - The connection is closed, or the reader is closed.

Example

using Oracle.ManagedDataAccess.Client;
using System;
using System.Data;
using System.Threading;
using System.Threading.Tasks;

namespace AsyncApp
{
  class AsyncDemo
  {
    static async Task Main()
    {
      string connectionString = "User Id=HR; Password=<PASSWORD>; Data Source=oracle;";
      OracleConnection oc = new OracleConnection(connectionString);
      await oc.OpenAsync(CancellationToken.None);

      OracleCommand cmd = oc.CreateCommand();
      cmd.CommandText = "BEGIN OPEN :1 FOR SELECT * FROM EMPLOYEES; OPEN :2 FOR SELECT * FROM DEPARTMENTS; END; ";

      OracleParameter p1 = cmd.Parameters.Add("1", OracleDbType.RefCursor);
      p1.Direction = ParameterDirection.Output;

      OracleParameter p2 = cmd.Parameters.Add("2", OracleDbType.RefCursor);
      p2.Direction = ParameterDirection.Output;

      OracleDataReader reader = await cmd.ExecuteReaderAsync();

      await reader.ReadAsync(CancellationToken.None);
      Console.WriteLine(reader.GetValue(0));

      Task task = reader.NextResultAsync(CancellationToken.None);
      Console.WriteLine("Hello World");
      await task;

      await reader.ReadAsync(CancellationToken.None);
      Console.WriteLine(reader.GetValue(0));
      oc.Close();
    }
  }
}