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The final assembly represents the client that makes calls into the WCF service. As you might expect, this client can be any type of .NET application. Similar to the host, client applications typically use a client-side *.config file that defines the client-side plumbing. You should also be aware that you can easily have a client application written in another framework (e.g., Java) if you build your WCF service using HTTP-based bindings. Figure 25-4 illustrates the relationship between these three interrelated WCF assemblies(from a high level). Behind the scenes, several lower-level details are used to represent the required plumbing (e.g., factories, channels, and listeners). These low-level details are usually hidden from view; however, they can be extended or customized if required. In most cases, the default plumbing fits the bill sufficiently.

int ErrorFunction(int a, int b) { #pragma unmanaged // Some unmanaged code #pragma managed // Some managed code }

It is also worth pointing out that using a server-side or client-side *.config file is technically optional. If you wish, you can hard-code the host (as well as the client) to specify the necessary plumbing (e.g., endpoints, binding, and addresses). The obvious problem with this approach is that if you need to change the plumbing details, you will need to recode, recompile, and redeploy a number of assemblies. Using a *.config file keeps your code base much more flexible because changing the plumbing is as simple as updating the file s content and restarting the application. On the other hand, programmatic configuration allows an application more dynamic flexibility it can choose how to configure the plumbing based on if-tests, for example.

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Many CLR methods accept reference types as parameters. For example, Console::WriteLine() accepts either a built-in type or a reference type as parameter.

Hosts and clients communicate with each other by agreeing on the ABCs, a friendly mnemonic for remembering the core building blocks of a WCF application address, binding, and contract: Address: Describes the location of the service. In code, you represent this with a System.Uri type; however, you typically store the value in *.config files. Binding: WCF ships with a many different bindings that specify network protocols, encoding mechanisms, and the transport layer. Contract: Provides a description of each method exposed from the WCF service.

Unsafe Code Since the #pragma unmanaged directive causes unsafe code to be generated, you need to compile it with the /clr option. If you try to compile it with the /clr:safe option, you will get a whole bunch of errors.

You should realize that the ABC abbreviation does not imply that a developer must define the address first, followed by binding, and ending with the contract. In many cases, a WCF developer begins by defining a contract for the service, followed by establishing an address and bindings (any order will do, as long as each aspect is accounted for). Before you build your first WCF application, you will take a more detailed walk through of the ABCs.

Understanding the notion of a contract is the key to building a WCF service. While not mandatory, the vast majority of your WCF applications will begin by defining a set of .NET interface types that are used to represent the set of members a given WCF service will support. Specifically, interfaces that represent a WCF contract are called service contracts. The classes (or structures) that implement them are called service types. WCF service contracts are adorned with various attributes, the most common of which are defined in the System.ServiceModel namespace. When the members of a service contract (the methods in the interface) contain only simple data types (e.g., numerical data, Booleans, and String data), you can build a complete WCF service using nothing more than the <ServiceContract()> and <OperationContract()> attributes. However, if your members expose custom types, you will need to use types in the System.Runtime.Serialization namespace (see Figure 25-5) of the System.Runtime.Serialization.dll assembly. Here you will find additional attributes (e.g., <DataMember()> and <DataContract()>) to finetune the process of defining how your composite types are serialized to and from XML when they are passed to and from service operations. Strictly speaking, you are not required to use CLR interfaces to define a WCF contract. Many of these same attributes can be applied on Public members of a Public class (or structure). However, given the many benefits of interface-based programming (e.g., polymorphism and elegant versioning), it is safe to consider using CLR interfaces to describe a WCF contract a best practice.

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