[C#]平行處理網路傳輸時因連線數不足發生連線Timeout的解決方案

namespace ConsoleApplication15 { class Program { public static string url = “https://www.google.com/images/srpr/logo3w.png"; private static List<WaitHandle> finished = new List<WaitHandle>(); public static void Main() { ServicePointManager.DefaultConnectionLimit = 200;
finished.Clear(); for (var idx = 0; idx < 5; ++idx ) { finished.Add(new ManualResetEvent(false)); Download(idx, url); } WaitHandle.WaitAll(finished.ToArray()); Console.WriteLine(“Done…”);
}

	private static void Download(int idx, string url)
	{
		var wc = new WebClient();
		wc.OpenReadCompleted += wc_OpenReadCompleted;
		wc.OpenReadAsync(new Uri(url), idx);
	}

	private static void wc_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e)
	{
		Console.WriteLine(string.Format("{0}: Download Completed", e.UserState));

		var idx = (int)e.UserState;
		var manualResetEvent = finished[idx] as ManualResetEvent;

		Debug.Assert(manualResetEvent != null, "manualResetEvent != null");
		manualResetEvent.Set();
	}     
}

}

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