// Sync.
private static void FetchStockQuotesSync(WebService svc)
{
// This blocks. You don't know when the FetchStockQuotes
// method returns. It may takes from minutes, to hours or
// it may not return at all.
IStockQuote qt = svc.FetchStockQuotes();
}
private static void Main()
{
IStockQuote qt = new StockQuote();
WebService svc = new WebService(qt);
FetchStockQuotesSync(svc);
FetchStockQuotesApm(svc);
#if AsyncEnumerator
FetchStockQuotesAsyncEnumerator(svc);
#endif
FetchStockQuotesAsyncCtp(svc);
Console.ReadLine();
}
// Async CTP
private static async void FetchStockQuotesAsyncCtp(WebService svc)
{
IStockQuote qt = await svc.FetchStockQuotesTaskAsync();
}
private static IEnumerator<Int32> FetchStockQuotesAsyncEnumerator(AsyncEnumerator ae, WebService svc)
{
svc.BeginFetchStockQuotes(ae.End(), null);
yield return 1;
IStockQuote qt = svc.EndFetchStockQuotes(ae.DequeueAsyncResult());
}
// AsyncEnumerator class.
private static void FetchStockQuotesAsyncEnumerator(WebService svc)
{
AsyncEnumerator ae = new AsyncEnumerator();
ae.BeginExecute(FetchStockQuotesAsyncEnumerator(ae, svc), ae.EndExecute);
}
private static void FetchStockQuotesApm(WebService svc)
{
Func<IStockQuote> @delegate = svc.FetchStockQuotes;
// This never blocks. Your code returns immediately.
@delegate.BeginInvoke(FetchStockQuotesApmCallback, @delegate);
}
// IAsyncResult interface (APM).
#if AsyncEnumerator
private static void FetchStockQuotesApm(WebService svc)
{
// This never blocks. Your code returns immediately.
svc.BeginFetchStockQuotes(FetchStockQuotesApmCallback, svc);
}
