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n the previous two chapters, you examined the steps taken by the CLR to resolve the location of an externally referenced assembly as well as the role of .NET metadata. In this chapter, you ll drill deeper into the details of how an assembly is hosted by the CLR and come to understand the relationship between processes, application domains, and object contexts. In a nutshell, application domains (or, simply, AppDomains) are logical subdivisions within a given process that host a set of related .NET assemblies. As you will see, an AppDomain is further subdivided into contextual boundaries, which are used to group together like-minded .NET objects. Using the notion of context, the CLR is able to ensure that objects with special runtime requirements are handled appropriately. Once you have come to understand how an assembly is hosted by the CLR, it s time to address the next obvious question: what is hosting the CLR As you recall from 1, the CLR itself is represented (in part) by mscoree.dll. When you launch an executable assembly, mscoree.dll is loaded automatically; however, as you will see, there are actually a number of transparent steps happening in the background.

The concept of a process has existed within Windows-based operating systems well before the release of the .NET platform. Simply put, a process is the term used to describe the set of resources (such as external code libraries and the primary thread) and the necessary memory allocations used by a running application. For each *.exe loaded into memory, the OS creates a separate and isolated process for use during its lifetime. Using this approach to application isolation, the result is a much more robust and stable runtime environment, given that the failure of one process does not affect the functioning of another. Now, every Win32 process is assigned a unique process identifier (PID) and may be independently loaded and unloaded by the OS as necessary (as well as programmatically using Win32 API calls). As you may be aware, the Processes tab of the Windows Task Manager utility (activated via the Ctrl+Shift+Esc keystroke combination) allows you to view various statistics regarding the processes running on a given machine, including its PID and image name, as you see Figure 15-1.

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Sometimes you require more control over the SOAP envelope that WCF generates. For example, you may want to be able to map fields in your message to the SOAP headers instead of the SOAP body. This is when message contracts come into play. The [MessageContract] attribute allows you to map fields into either the SOAP body or the SOAP headers by means of the [MessageBody] and [MessageHeader] attributes, as shown in Listing 3-4. Listing 3-4. Quote as a MessageContract using System; using System.ServiceModel; namespace QuickReturns.StockTrading.ExchangeService.MessageContracts { [MessageContract] public class QuoteMessage { [MessageBody] public string Ticker; [MessageBody] public decimal Bid; [MessageBody] public decimal Ask; [MessageHeader] public string Publisher; [MessageBody] private DateTime UpdateDateTime; } } In this example, the publisher has now moved from the SOAP body to the SOAP headers. Now you can use this message contract in an operation contract, just like you did with the data contract. So when you need direct control over the SOAP envelope, you can use message contracts to control how properties of your types map to the SOAP headers and SOAP body.

If you do not see a PID column listed in Task Manager, simply select View Select Columns and check the PID box.

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