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When the VB 2005 compiler processes the Delegate keyword, the dynamically generated class defines two methods named BeginInvoke() and EndInvoke(). Given our definition of the BinaryOp delegate, these methods are prototyped as follows : NotInheritable Class BinaryOp Inherits System.MulticastDelegate ... ' Used to invoke a method asynchronously. Public Function BeginInvoke(ByVal x As Integer, ByVal y As Integer, _ ByVal cb As AsyncCallback, ByVal state As Object) As IAsyncResult End Function ' Used to fetch the return value ' of the invoked method. Public Function EndInvoke(ByVal result As IAsyncResult) As Integer End Function End Class

The first stack of parameters passed into BeginInvoke() will be based on the format of the VB 2005 delegate (two Integers in the case of BinaryOp). The final two arguments will always be System.AsyncCallback and System.Object. We ll examine the role of these parameters shortly; for the time being, though, we ll supply Nothing for each.

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Through the AddBindingParameters method and the provided BindingParameterCollection, you can pass information about the contract to the channel stack to implement concepts such as security and transactions Therefore, you can probably imagine this is an important interception and extensibility point if you want to hook into the WCF programming model This enables you to create even more powerful solutions than you get out of the box The default [ServiceBehavior] attribute already provides you with a lot of functionality that can be set through its properties (Name, Namespace, and ConfigurationName are omitted because they are common across WCF): AddressFilterMode (AddressFilterMode): By default WCF will match messages to their destination endpoint, matching it with the WS-Addressing To header in the SOAP message For example, setting AddressFilterMode to AddressFilterModePrefix will instruct WCF to match the endpoints on the start of the endpoint URI.

Also note that the BeginInvoke() method always returns an object implementing the IAsyncResult interface, while EndInvoke() requires an IAsyncResult-compatible type as its sole parameter. The IAsyncResult-compatible object returned from BeginInvoke() is basically a coupling mechanism that allows the calling thread to obtain the result of the asynchronous method invocation at a later time via EndInvoke(). The IAsyncResult interface (defined in the System namespace) is defined as follows: Public Interface IAsyncResult ReadOnly Property AsyncState() As Object ReadOnly Property AsyncWaitHandle() As WaitHandle ReadOnly Property CompletedSynchronously() As Boolean ReadOnly Property IsCompleted() As Boolean End Interface In the simplest case, you are able to avoid directly invoking these members. All you have to do is cache the IAsyncResult-compatible object returned by BeginInvoke() and pass it to EndInvoke() when you are ready to obtain the result of the function invocation. As you will see, you are able to invoke the members of an IAsyncResult-compatible object when you wish to become more involved with the process of fetching the method s return value.

Note If you asynchronously invoke a method that does not provide a return value, you can simply fire and forget. In such cases, you will never need to cache the IAsyncResult-compatible object or call EndInvoke() in the first place (as there is no return value to retrieve).

Figure 3 11. Daniel Alm and Thomas Osthege used custom edit menu items and keyboard layouts in their PocketCAS graphics calculator iPad app. Alongside the standard edit menu commands is a custom Insert Matrix menu item.

To instruct the BinaryOp delegate to invoke Add() asynchronously, you can update the previous Main() method as follows: Sub Main() Console.WriteLine("***** Async Delegate Invocation *****") Console.WriteLine() ' Print out the ID of the executing thread. Console.WriteLine("Main() invoked on thread {0}.", _ Thread.CurrentThread.GetHashCode) ' Invoke Add() on a secondary thread. Dim b As BinaryOp = New BinaryOp(Add) Dim itfAR As IAsyncResult = b.BeginInvoke(10, 10, Nothing, Nothing) ' Do other work on primary thread... Console.WriteLine("Doing more work in Main()!")

AutomaticSessionShutdown (boolean): Specifies whether to automatically close a session when a client closes an output session ConcurrencyMode (ConcurrencyMode): Specifies whether a service supports one thread, multiple threads, or reentrant calls Valid values are Reentrant, Single, or Multiple Single and Multiple correspond to single and multithreaded types of service, and the Reentrant service accepts calls that have the same thread context It is particularly useful when a service calls another service, which subsequently calls back to the first service In this case, if the first service is not reentrant, the sequence of calls results in a deadlock The default is percall and is typically the best choice because it is best to keep your services stateless to provide scalability..

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