Silverlight/Windows Phone 7 Equivalent of android.os.Handler

The Android platform has a Handler clas开发者_如何学Pythons for queueing messages or events to be run at a later stage or on a different thread. I was looking around the MSDN docs and the net for some equivalent API available on the the Windows Phone 7 platform but did not find anything.

I could implement that service myself but would hate to reinvent the wheel. Has anyone had found something similar or have any bright ideas?

Cheers, Alasdair.

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Here is the gist of the code. You will definitely need to make changes. Hope it helps.

   private static Queue<Dictionary<string, string>> messages;
   ....
   {   
        ...
        AutoResetEvent ev = new AutoResetEvent(false);
        ...
        Dictionary<string, string> msg1 = new Dictionary<string, string>();
        msg1.Add("Id", "1");
        msg1.Add("Fetch", "Song1");
        Dictionary<string, string> msg2 = new Dictionary<string, string>();
        msg2.Add("Id", "2");
        msg2.Add("Fetch", "Song2");

        messages.Enqueue(msg1);
        messages.Enqueue(msg2);

        ThreadPool.RegisterWaitForSingleObject(
            ev,
            new WaitOrTimerCallback(WaitProc),
            messages,
            5000,
            false
        );

        // The main thread waits 10 seconds, to demonstrate the
        // time-outs on the queued thread, and then signals.
        Thread.Sleep(10000);
        ...
    }
    private static void WaitProc(object state, bool timedOut)
    {
        // The state object must be cast to the correct type, because the
        // signature of the WaitOrTimerCallback delegate specifies type
        // Object.
        Queue<Dictionary<string, string>> dict = (Queue<Dictionary<string, string>>)state;

        string cause = "TIMED OUT";
        if (!timedOut)
        {
            cause = "SIGNALED";
            //signaled to return. return without doing any work
            return;
        } 
        // timed out. now do the work 
        Dictionary<string, string> s1 = dict.Dequeue();
    }

`

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Not sure if you are looking for a service to execute something in the background or something on a thread. Have you looked at ThreadPool class for threading?

You can use ThreadPool.QueueUserWorkItem to run on a different thread or use ThreadPool.RegisterWaitForSingleObject to register a delegate to wait for a timeout and run later.