Implementing Custom Behaviors in VS .NET

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self-contained but least maintainable mechanism, because any behavior changes in the service will require a recompile Use attributes to add the behavior into the client or server runtime For this, you should implement the Attribute interface This enables developers to use the attribute when de ning the service, endpoint, or operations in their code Use con guration to add a behavior into the client or server runtime For this, you must do two additional steps First, create a class that implements the interface and de nes the con guration data elements with the attribute in that class In that interand face, you must also implement the methods to create and return your new class Then, in the con guration le for the client or service that will use the behavior, you need to add a section where you reference the fully quali ed type, and then use the behavior at the service or endpoint level After you complete these three steps, the behavior is ready to be used It will automatically be called when the client or service is building its runtime and as each message is sent and received from the client or service The rest of this section demonstrates speci c behaviors
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Implementing a Message Inspector for Service Endpoint Behavior Listing 523 implements a logging behavior by printing out every message sent and received by an endpoint The code shows a message inspector called from an endpoint behavior This also shows how the endpoint behavior is manually added to the service description in a custom hosted service
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In practice, if you re implementing a message inspector for diagnostic purposes, see 10, Exception Handling, for tracing techniques
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5: Behaviors
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The class implements the interface In its and it impleprints out the message to the console The class interface In its ments the method it adds the class to the list of message inspectors to be called with each message Finally, the main program adds the class to the list of behaviors on all endpoints Note that because the service also has a MEX endpoint, the request and response to that endpoint is also printed by
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Listing 523 Message Inspector in a Service Endpoint Behavior
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Implementing Custom Behaviors
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5: Behaviors
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Listing 523 continued
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Exposing a Parameter Inspector for Service Operation Behavior as an Attribute Listing 524 implements a behavior for validating parameters against regular expressions It can be applied to any operation and enables the developer to de ne a regular expression and an error message to return if the parameter is invalid The code shows a parameter inspector called from an operation behavior and shows the operation behavior implementing an attribute It also shows how the operation behavior is added to the service description by referencing the attribute in the service de nition implements the The class interface The class stores two local properties, and , that method In that method, are used to validate parameters in the the parameter value is compared to the parameter pattern using regular expression matching If the value does not t the pattern, an error is thrown implements the The class and interfaces In its method it adds the class to the list of parameter inspectors to be called , is for each operation Finally, when the service operation, attribute is used to validate its paramede ned, the ters at runtime
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Implementing Custom Behaviors
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Listing 524 Custom Parameter Inspector in an Operation Behavior Exposed as an Attribute
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5: Behaviors
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Listing 524 continued
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Implementing Custom Behaviors
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Exposing a Service Behavior Through Configuration Listing 525 implements a behavior for validating that a software license key is installed in the service con guration If it is not present or if it is invalid, the service will not start It shows an endpoint behavior that validates con guration information as the service runtime is built It also shows a behavior extension that is called as the service runtime is being built and how that extension adds the behavior to the service runtime The result is that a custom behavior is used in the con guration le or ) and added to the service runtime so that con( guration information can be validated as the service starts implements the The class interface The class has two local properties, and The method of compares those properties against predetermined values implements the The class interface It de nes two that can be represented in the con guration le It overrides the and methods so that it returns and creates the custom , during runtime startup The constructor of behavior, takes two arguments, one for each property, so it can do the validation
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