C# Call single method multiple times simultaneously

I have a Method which calls a Web Service.

function void SendAsync( object input )
{
     // Log Time Before Send to WebService (T1)
     ......  Call WebMethod ....
     // Log Time After Send to WebService (T2)
}

I want to run a loop and call the Web method with different Input data. Without waiting for the response I want to keep on calling the Web Method.

for ( int i=1;i<=100;i++ )
{ 
            //LOG TIME BEFORE Calling Async Method (T0)

            //TRIAL 1
            ThreadPool.QueueUserWorkItem(new WaitCallback(t.SendAsync), i.ToString());

            //TRIAL 2
            new Task(() => { SendAsync(i.ToString()); }).Start();

            //TRIAL 3
            Task.Factory.StartNew(() => SendAsync(i.ToString()));

            //TRIAL 4
            AsyncTask_Delegate adel = null;
            adel = new AsyncTask_Delegate(SendAsync);
            IAsyncResult R = null;
            R = adel.BeginInvoke(i.ToString(), null, null); //invoking the method
}

I want to call this function as Async call. I have tried various approaches as mentioned above.

The time between T0 and T1 is quite substantial (Even in 15-40 Seconds). Next Method call is happening in the loop, but the actual Call to the Web method is getting delayed. The method is not running concurrently. I even put the SendAsync method in different class and call the method still the same result.....

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Thank you all for your responses.

Adding more light on the problem is that I am creating an input string during each loop and sending it to a function for processing.

Also instead of Calling a Web Method even when we call a normal simple method, the difference between T0 and T1 is large.

The same function is running in Async mode but simply not able to run or start simultaneously.

I have tried to create a copy like "var tmp=i;" before calling, but delay is still present.

Jon Skeet
people
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I suspect it is running concurrently - but that the degree of concurrency is being limited by the HTTP connection pool.

You might to change ServicePointManager.DefaultConnectionLimit or set it in your app.config with the <connectionManagement> element.

Additionally, note that these lines are suspect:

new Task(() => { SendAsync(i.ToString()); }).Start();
Task.Factory.StartNew(() => SendAsync(i.ToString()));

In both cases you're capturing i, which is being update by the main thread. You need to capture a copy of the value of i for that iteration:

int x = i;
new Task(() => { SendAsync(x.ToString()); }).Start();
Task.Factory.StartNew(() => SendAsync(x.ToString()));

Otherwise you may well see SendAsync("2") twice and no call to SendAsync("1") for example.

people

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