CODEWITHSUNDEEP
multithreadingweb-servicesasynchronous.net-3.5
Hélder Gonçalves
Hélder Gonçalves

Reputation: 3942

IAsyncResult and Multithreading in .NET 3.5

I'm want to make multiple requests to a remote service and I'm trying an asynchronous/multithread approach. For the concurrent part, I'll try this http://coding-time.blogspot.pt/2008/03/implement-your-own-parallelfor-in-c.html

IList<string> returnedValues = new List<string>();
int numberOfRequests = 5;
object sync = new object();
ParallelUtilities.For(0, numberOfRequests, delegate(int i)
{
    string response = string.Empty;
    try
    {
         try
            {
                Func<int, string> caller = CallService;
                IAsyncResult result = caller.BeginInvoke(i, null, null);
                Thread.Sleep(0);
                string returnValue = caller.EndInvoke(result);

                lock (sync)
                {
                    returnedValues.Add(returnValue);
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine(string.Concat("ex: ", ex.Message, "stack:", ex.StackTrace));
            }
    });
}

And the service call

private string CallService(int index)
{
    string value;
    using (var channel = GetClientChannel<IService>("http://localhost:51383/Service/Service.svc"))
    {
        value = channel.GetValue(index);
    }
    return value + "for this index:" + index;
}

Is there a better way to do this? How do IAsyncResult works in multithreading?

Upvotes: 0

Views: 119

Answers (1)

usr
usr

Reputation: 171178

Replace

            IAsyncResult result = caller.BeginInvoke(i, null, null);
            Thread.Sleep(0);
            string returnValue = caller.EndInvoke(result);

with

            string returnValue = CallService(result);

There's no point in starting code on the thread-pool and then waiting for it immediately. What would you gain by doing that? The Sleep is especially suspicious to me. You try to initiate a context switch which just adds additional overhead.

How do IAsyncResult works in multithreading?

The two are not related. What do you mean?

Upvotes: 2

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