Implementing a WCF Ser vice in VS .NET

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Implementing a WCF Ser vice
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Just the ABCs To de ne a service endpoint, remember the ABCs: address, binding, and contract In Listings 11 to 13, the following are described:
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A is for address, the where This service listens for incoming requests at http://localhost:8000/EssentialWCF , B is for binding, the how This example uses which directs WCF to implement WS-I Basic Pro le 11, the common protocols of Web service communication C is for contract, the what This is the syntactic description of what operations the service responds to and what message formats it expects in and out In this example, the contract is de ned by the class In this section we will implement the service twice First we ll demonstrate the solution completely in code, where the ABCs are de ned directly in the source code This will remove external dependencies Then we ll demonstrate the solution again using con guration les This will result in less code but will increase the service complexity because of dependencies between code and con guration In reality, you ll probably take the latter approach because the increased complexity is richly rewarded with exibility The exibility derives from exposing some features in con guration, where system administrators can modify them, while exposing other features in code, where only developers can make changes
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Writing a WCF Service Entirely in Code At a super-high level, writing a WCF service is similar to writing any other service, regardless of internals You rst write some code that implements a capability or feature; then you host that code in an operating system process, and that process listens for requests and responds WCF formalizes these steps a bit and makes it easy for the developer to do the right thing at each juncture For instance, using the system-supplied bindings and encoders, WCF services will communicate though standards-based SOAP messages By default, threading, concurrency, and instancing are well implemented and have predicable behavior
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1: Basics
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To implement a WCF service, you implement a NET class and then attributes The decorate the class with namespace is installed with NET 30 and contains most of the WCF implementation When the code compiles, the CLR interprets those attributes, replacing them with runtime code Attributes are nothing new to NET; they ve been around since NET 10 WCF, like ASMX in NET 10 and 11 and 20, uses attributes to make you more productive when writing services Listing 11 shows the complete code for a WCF service that is hosted in a console application In this example, we do the following De ne the contract Write a NET class that does something useful attribute and decorate it with WCF attributes The marks a class as a contract Expressed in standards-based WSDL, the de nes a The attribute de nes methods that can be invoked on the class through the service interface It also de nes the messages that are passed to and from those class methods Expressed in WSDL, the de nes Operations and Messages Listings 11 to 13 use that has a single method, a class named
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NOTE
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The samples in this book use very simplistic interfaces, often accepting and returning a single string or number In practice, your service operations will likely accept and return complex types Communicating over a wire should be more chunky than chatty, minimizing network traf c and response latency This requires passing more information with each call, requiring complex types for input and return values De ne an endpoint Within the endpoint de nition, we ll specify an address, binding, and contract by using the method on the class The address is blank, which indicates that the address of the endpoint is the same as the base address
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