How to Initiate task and exit the method in an event

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Hi friends,
I am subscribed to an event

C#

public void Call_Comes(object sender, EventArgs e)
{
     //Code here
}

I don't want to do the tasks to be carried out inside this event, as it will take long time...
What I want is to collect the information and initiate the task, and exit the event...
How can I achieve this ?? I have used threading inside event.. But it seems that event is waiting for the thread to finish....
Can anybody help me ??

Posted 21-Oct-13 0:30am

Yesudasan Moses

Updated 21-Oct-13 0:31am

v2

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Fredrik Bornander · Answer 1 · 2013-10-21T00:40:00

Solution 1

There are many ways to decouple the event handler onto a different thread;

One of these might work for you;

C#

// Option 1
public void Call_Comes(object sender, EventArgs e) {
    Task.Factory.StartNew(() => HandleEvent(sender, e));
}

// Option 2
public void Call_Comes(object sender, EventArgs e) {
    ThreadPool.QueueUserWorkItem(x => HandleEvent(sender, e));
}

// Option 3
public void Call_Comes(object sender, EventArgs e) {
    var worker = new BackgroundWorker();
    worker.DoWork += HandleEvent;
    worker.RunWorkerAsync();
}

// Option 4
public void Call_Comes(object sender, EventArgs e)
{
    var thread = new Thread(() => HandleEvent(sender, e));
    thread.Start();
}

private void HandleEvent(object sender, EventArgs e) {
    // Your stuff
}

Note that if you do run it on a different thread you still need to handle any exceptions. You don't wan't uncaught exceptions on non-main threads.

Hope this helps,
Fredrik

Posted 21-Oct-13 0:40am

Fredrik Bornander

Comments

Yesudasan Moses 21-Oct-13 6:58am

Nothing works...
I have tried this on a fresh win project,,, there, everything works well...
But this particular library's events waits for any threads to finish inside this....
I don't know if they are using any locks for this...

Fredrik Bornander 21-Oct-13 7:14am

I think it's unlikely that the library is waiting for any threads created in the event handler, that's a fairly complex and weird piece of functionality to add.

If you try something like this; what is printed to your output window:
<pre>
public void Call_Comes(object sender, EventArgs e) {
System.Diagnostics.Debug.WriteLine("Event fired from thread " + Thread.CurrentThread.ManagedThreadId);
Task.Factory.StartNew(() => HandleEvent(sender, e));
System.Diagnostics.Debug.WriteLine("Event processessing done");
}

private void HandleEvent(object sender, EventArgs e) {
System.Diagnostics.Debug.WriteLine("Handling on thread " + Thread.CurrentThread.ManagedThreadId);
Thread.Sleep(1000);
System.Diagnostics.Debug.WriteLine("Done handling on thread " + Thread.CurrentThread.ManagedThreadId);
}
</pre>

Yesudasan Moses 21-Oct-13 7:59am

Hi I tried ur code,,, This is the Output

Main Event fired from thread 18
Event processessing done
Handling on thread 18
Done handling on thread 18

Fredrik Bornander 21-Oct-13 8:08am

So the event completes, the magically the payload that is supposed to run on a background thread runs on the same thread?

Are you installing a custom thread scheduler to the Task factory?

Yesudasan Moses 21-Oct-13 8:11am

No,,, I am not doing anything,,,, Referencing a library (Asterisk.NET) and subscribing to its events... That event shows me this problem,,

Fredrik Bornander 21-Oct-13 8:16am

Which event are you listening to?

Yesudasan Moses 21-Oct-13 8:18am

New_State_Event

Yesudasan Moses 21-Oct-13 8:21am

Now, I am thinking to add the event information in a queue, and check the queue with a backgroundworker or any other thread.... Will it be good ???