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  1.    #1  
    Hi,


    I am using HttpWebRequest class for Rest Service call in Windows phone 7.1.I want to use the response of the call back function of service call .but before invoking call back function, next statement in the function that is calling service call is executing .Is there any solution for this?
  2. wenogg's Avatar
    Developer

    Posts
    51 Posts
    #2  
    Check out the Async CTP. It allows you to use async/await. This should enable the behavior you are looking for.
  3. dotnetnelson's Avatar
    Developer

    Posts
    13 Posts
    #3  
    You can use a ManualResetEvent to signal a thread to wait. Look it up on MSDN.

    Or if you do like above suggested then you can use async as follows:
    Code:
    await MyAsyncMethod().AsTask().Wait();
    Also: I'll note that synchronous calls are highly not recommended. You're much better chaining responses using async/await continuations.
  4. CommonBlob's Avatar
    Developer

    Posts
    160 Posts
    #4  
    Quote Originally Posted by dotnetnelson View Post
    You can use a ManualResetEvent to signal a thread to wait. Look it up on MSDN.

    Or if you do like above suggested then you can use async as follows:
    Code:
    await MyAsyncMethod().AsTask().Wait();
    Also: I'll note that synchronous calls are highly not recommended. You're much better chaining responses using async/await continuations.
    Im a bit new to using await, but I highly recommend that method.
    Windows Phone/XNA Developer
  5. dotnetnelson's Avatar
    Developer

    Posts
    13 Posts
    #5  
    await is basically a shorthand for .ContinueWith( .. ) on a Task of T .

    Code:
    var result = await SomeAsyncFunction();
    MessageBox.Show(result.ToString());
    When you await SomeAsyncFunction() the method you're currently in immediately returns to the caller. Anything after "await" is chained up into a continuation of the asynchronous operation.

    So even though the code looks sequential, anything after "await XXX" will only execute once the asynchronous operation has completed. It allows your code to be less disjointed as a result.

    Also to note is that the thread your implicit continuation returns on is the same thread you awaited on. So if you await an async method on the UI thread, it will chain your continuation on the UI thread and do the async operation off thread.

    It basically saves some typing:

    Code:
    Task.Factory.StartNew<string>(() => { return SomeSyncOp(); }).ContinueWith(result => { MessageBox.Show(result) });
    Only my continuation doesn't do marshaling back to the UI thread.

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