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An asynchronous HTTP handler differs from a synchronous one in that when it is executed, ASP.NET will put the handler code on a separate thread, one obtained from the CLR. The thread that would normally run a synchronous handler is then placed back into the thread pool to handle additional user requests. This reduces the chance that the limited set of ASP.NET threads will block processing, and thus can improve overall performance. You create an asynchronous handler much like you would a synchronous handler. You use a similar interface called IHttpAsyncHandler and then override the IsReusable property and the BeginProcessRequest method. You write code inside this method to initiate an asynchronous call. You also provide a callback method that gets called when the asynchronous operation completes. Finally, you write code inside the EndProcessRequest method to deal with any cleanup when the process completes.

However, you may need to more finely control how the collection of items is displayed in the view, or track the user s interaction with the displayed collection of items, from within the view model itself For example, you might need to allow the collection of items to be filtered or sorted according to presentation logic implemented in the view model, or you might need to keep track of the currently selected item in the view so that commands implemented in the view model can act on the currently selected item WPF and Silverlight support these scenarios by providing various classes that implement the ICollectionView interface This interface provides properties and methods to allow a collection to be filtered, sorted, or grouped, and to allow the currently selected item to be tracked or changed.

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Consider the image handler created in the previous example. We can rewrite that example to demonstrate asynchronous processing. You start by implementing the IHttpAsyncHandler interface. Remember, you write your code inside the BeginProcessRequest method. You must also include code for IsReusable, EndProcessRequest, and ProcessRequest. You can make the latter simply throw an exception if your handler is called in a synchronous way. Inside BeginProcessRequest, you create an instance of a class that implements the IAsyncResult interface. This custom class is where you put your code that is to be run on a separate thread. In the example code shown next, that is done inside the StartAsync method. Notice the call to ThreadPool.QueueUserWorkItem. This passes the name of the method (StartAsyncOperation) you want to run on a separate thread. When a thread becomes available, this method will execute. When it is finished, the method running on the separate thread invokes the callback delegate, which is of type AsyncCallback.

Sample of Visual Basic Code Imports Microsoft.VisualBasic Imports System.Threading Public Class AsynchImageHandler Implements IHttpAsyncHandler Public ReadOnly Property IsReusable As Boolean _ Implements System.Web.IHttpHandler.IsReusable Get Return False End Get End Property Public Function BeginProcessRequest(ByVal context As System.Web.HttpContext, _ ByVal cb As System.AsyncCallback, ByVal extraData As Object) _ As System.IAsyncResult _ Implements System.Web.IHttpAsyncHandler.BeginProcessRequest context.Response.Write("<p>BeginProcessRequest starting ...</p>") Dim imageOperation As New ImageAsynchOperation(cb, context, extraData) imageOperation.StartAsync() context.Response.Write("<p>BeginProcessRequest queued ...</p>") Return imageOperation End Function

I set up the application to run infinitely, started it, and then let it run while I took care of a final few projects before heading home for the day I glanced over my shoulder once in a while, happy to see the application connecting and disconnecting every few seconds However, just as I stood up to leave, I turned around to take one final look at my test application and I saw that it had crashed I happened to be running under the debugger and noticed that the crash was caused by a memory leak, and the application was out of a particular Windows resource At first, I thought it was a problem in my application, so I spent some time scanning the source code looking for any place where items had been using that type of resource or perhaps misusing a Windows API.

Public Sub EndProcessRequest(ByVal result As System.IAsyncResult) _ Implements System.Web.IHttpAsyncHandler.EndProcessRequest 'process any cleanup code here End Sub Public Sub ProcessRequest(ByVal context As System.Web.HttpContext) _ Implements System.Web.IHttpHandler.ProcessRequest Throw New InvalidOperationException() End Sub End Class Class ImageAsynchOperation Implements IAsyncResult Private Private Private Private _completed As Boolean _state As [Object] _callback As AsyncCallback _context As HttpContext

Public Sub New(ByVal callback As AsyncCallback, _ ByVal context As HttpContext, _ ByVal state As [Object]) _callback = callback _context = context _state = state _completed = False End Sub ReadOnly Property IsCompleted() As Boolean _ Implements IAsyncResult.IsCompleted Get Return _completed End Get End Property ReadOnly Property AsyncWaitHandle() As WaitHandle _ Implements IAsyncResult.AsyncWaitHandle Get Return Nothing End Get End Property

ReadOnly Property AsyncState() As [Object] _ Implements IAsyncResult.AsyncState Get Return _state End Get End Property ReadOnly Property CompletedSynchronously() As Boolean _ Implements IAsyncResult.CompletedSynchronously Get Return False End Get End Property Public Sub StartAsync() ThreadPool.QueueUserWorkItem(New _ WaitCallback(AddressOf StartAsyncOperation), Nothing) End Sub Private Sub StartAsyncOperation(ByVal workItemState As [Object]) Dim Request As HttpRequest = _context.Request Dim Response As HttpResponse = _context.Response If Request.RawUrl.ToLower.Contains("jellyfish") Then Response.Write("<p>JellyFish</p>") ElseIf Request.RawUrl.ToLower.Contains("koala") Then Response.Write("<p>Koala</p>") Else Response.Write("<p>Not found.</p>") End If Response.Write("<p>Asynch operation completed.</p>") _completed = True _callback(Me) End Sub End Class

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