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The point of this chapter was to examine exactly how a .NET executable image is hosted by the .NET platform. As you have seen, the long-standing notion of a Win32 process has been altered under the hood to accommodate the needs of the CLR. A single process (which can be programmatically manipulated via the System.Diagnostics.Process type) is now composed of multiple application domains, which represent isolated and independent boundaries within a process. As you have seen, a single process can host multiple application domains, each of which is capable of hosting and executing any number of related assemblies. Furthermore, a single application domain can contain any number of contextual boundaries. Using this additional level of type isolation, the CLR can ensure that special-need objects are handled correctly. The chapter concluded by examining the details regarding how the CLR is hosted by the Win32 OS.

Typed proxies and dispatchers are responsible for handing over messages from the service runtime to the messaging layer and the other way around The typed proxy offers methods that are useful to your applications, and it transforms the method calls into WCF messages and hands them over to the messaging layer to transmit them to the service The dispatcher is used on the service side to handle the messages coming in on the channels and is responsible for sending them over to your application code Figure 3-9 shows this graphically As you can see in Figure 3-9, you have proxy operations and a proxy behavior on the client side that are responsible for influencing the channel layer For every method in your service contract of your service, you have one proxy operation The operations share one proxy behavior.

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Figure 3 10. UIModalPresentationPageSheet has a fixed 768-pixel width, but spans the full screen height.

n the previous chapter, you examined the relationship between processes, application domains, and contexts. This chapter builds on your newfound knowledge by examining how the .NET platform allows you to build multithreaded applications and how to keep shared resources thread-safe. You ll begin by revisiting the .NET delegate type and come to understand its intrinsic support for asynchronous method invocations. As you ll see, this technique allows you to invoke a method on a secondary thread of execution automatically. Next, you ll investigate the types within the System. Threading namespace. Here you ll examine numerous types (Thread, ThreadStart, etc.) that allow you to easily create additional threads of execution. As you will see, the complexity of multithreaded development isn t in the creation of threads, but in ensuring that your code base is well equipped to handle concurrent access to shared resources. Given this, the chapter closes by examining various synchronization primitives that the .NET Framework provides.

In the previous chapter, a thread was defined as a path of execution within an executable application. While many .NET applications can live happy and productive single-threaded lives, an assembly s primary thread (spawned by the CLR when Main() executes) may create secondary threads of execution to perform additional units of work. By implementing additional threads, you can build more responsive (but not necessarily faster executing) applications. The System.Threading namespace contains various types that allow you to create multithreaded applications. The Thread class is perhaps the core type, as it represents a given thread. If you wish to programmatically obtain a reference to the thread currently executing a given member, simply call the shared Thread.CurrentThread property: Private Sub ExtractExecutingThread() ' Get the thread currently ' executing this method. Dim currThread As Thread = Thread.CurrentThread End Sub Under the .NET platform, there is not a direct one-to-one correspondence between application domains and threads. In fact, a given AppDomain can have numerous threads executing within it at any given time. Furthermore, a particular thread is not confined to a single application domain during its lifetime. Threads are free to cross application domain boundaries as the Win32 thread scheduler and CLR see fit.

The proxy behavior deals with all the messages flowing between the channel layer and your application On the proxy behavior level, you can make interceptions to deal with parameter interception, serialization, formatting, the mapping to real methods, and so on On the operation behavior level, you can perform such tasks as selecting channels, selecting operations (mapping methods), or inspecting messages..

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