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IL_0002: ldarg.2 IL_0003: add.ovf IL_0004: stloc.0 IL_0005: br.s IL_0007 IL_0007: ldloc.0 IL_0008: ret } // end of method Calc::Add Don t worry if you are unable to make heads or tails of the resulting CIL code for this method. In reality, a vast majority of .NET developers could care less about the details of the CIL programming language. Simply understand that the Visual Basic 2005 compiler translates your code statements into terms of CIL. Now, recall that this is true of all .NET-aware compilers. To illustrate, assume you created this same application using C#, rather than VB 2005 (again, don t sweat the syntax, but do note the similarities in the code bases): // Calc.cs using System; namespace CalculatorExample { // Defines the program's entry point. public class CalcApp { static void Main() { Calc c = new Calc(); int ans = c.Add(10, 84); Console.WriteLine("10 + 84 is {0}.", ans); Console.ReadLine(); } } // The C# calculator. public class Calc { public int Add(int x, int y) { return x + y; } } } If you examine the CIL for the Add() method, you find similar instructions (slightly tweaked by the C# compiler): .method public hidebysig instance int32 Add(int32 x, int32 y) cil managed { // Code size 8 (0x8) .maxstack 2 .locals init ([0] int32 CS$1$0000) IL_0000: ldarg.1 IL_0001: ldarg.2 IL_0002: add IL_0003: stloc.0 IL_0004: br.s IL_0006 IL_0006: ldloc.0 IL_0007: ret } // end of method Calc::Add

You can define the [ServiceBehavior] attribute on the service implementation (class) level to specify service-wide execution behavior. In other words, you cannot apply this attribute to the interface (contract) level. This distinction is important. The behaviors in WCF have to do with the internals of the implementation, not with the service contract. Listing 3-16 shows the interface of the IServiceBehavior interface that the ServiceBehaviorAttribute implements.

When you run this program, you should notice that a 5-second delay takes place before you see the Console.WriteLine() logic execute. Although many (if not most) methods may be called synchronously without ill effect, .NET delegates can be instructed to call their methods asynchronously if necessary.

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If you are new to the topic of multithreading, you may wonder what exactly an asynchronous method invocation is all about. As you are no doubt fully aware, some programming operations take time. Although the previous Add() was purely illustrative in nature, imagine that you built a single-threaded application that is invoking a method on a remote object, performing a long-running database query, or writing 500 lines of text to an external file. While performing these operations, the application may appear to hang for quite some time. Until the task at hand has been processed, all other aspects of this program (such as menu activation, toolbar clicking, or console output) are unresponsive. The question therefore is, how can you tell a delegate to invoke a method on a separate thread of execution to simulate numerous tasks performing at the same time The good news is that every .NET delegate type is automatically equipped with this capability. The even better news is that you are not required to directly dive into the details of the System.Threading namespace to do so (although these entities can quite naturally work hand in hand).

Listing 3-16 IServiceBehavior Interface public interface IServiceBehavior { // Methods void AddBindingParameters(ServiceDescription description, ServiceHostBase serviceHostBase, Collection<ServiceEndpoint> endpoints, BindingParameterCollection parameters); void ApplyDispatchBehavior(ServiceDescription description, ServiceHostBase serviceHostBase); void Validate(ServiceDescription description, ServiceHostBase serviceHostBase); } As you can gather, the most important method on the IServiceBehavior interface is called ApplyDispatchBehavior, which comes with two parameters The ServiceDescription is mainly provided to inspect the entire service description However, in practice you could also modify it, although that is not typically what you do at this level Validate is called in order for you to be able to validate the endpoint WCF will automatically call it for you The ChannelDispatchers collection that ServiceHostBase provides is obviously provided to inject code into the dispatcher pipeline and influence the dispatching behaviors This is basically where the translation is made between the NET objects and the actual sockets underneath the transport.

If you need to provide several options to the user, you should consider presenting them in a popover action sheet instead Eager to add custom menu items (such as the one shown in Figure 3 11) to your own iPad apps In 9, you ll learn how to accomplish this with only a handful of code lines..

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