Question

I need to make some parallel code on my server side . I’m aware to the async feature in . Net 4.5 .
But I need to implement it in . Net 4 .
How can make the parallel code and wait till it finishes. Is there an example to do it with TPL library .
My server side is a Wcf service , I make calls to the db sequentially till get final result . These calls can be parallel and get all the data for short time .
Thanks in advance .

Answer 1

Create worker class:

public class AsyncClass
{
    public delegate void WorkFinishedDelegate();

    public event WorkFinishedDelegate WorkFinishedEvent;

    public void StartJob()
    {
        System.Threading.ThreadStart ts = new System.Threading.ThreadStart(DoSomeJob);
        System.Threading.Thread th = new System.Threading.Thread(ts);
        //this will stast async thread...
        th.Start();
    }

    void DoSomeJob()
    { 
        //TODO: do your job


        //nofity you have completed...
        if (WorkFinishedEvent!= null)
        {
            WorkFinishedEvent();
        }
    }
}

Call your class:

        AsyncClass ac = new AsyncClass();
        ac.WorkFinishedEvent += new AsyncClass.WorkFinishedDelegate(ac_WorkFinishedEvent);
        ac.StartJob();

        void ac_WorkFinishedEvent()
        {
            //here you have been notified!
        }