Endpoint Behavior Exposed in Configuration in Visual Studio .NET

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Listing 525 Endpoint Behavior Exposed in Configuration
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Listing 526 shows the con guration le for the service In the con guis added, pointing to the extension ration le a
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implementation Notice that the implementation is fully quali ed, including its type name and assembly information (title, version, culture, and public key) In this example, the assembly name and DLL that houses the extensions is Server
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Listing 526 Configuration File for Exposing an Endpoint Behavior
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There are some important behaviors that handle security These are covered in detail in 8, Security, but it s worth understanding their role as behaviors behavior is a service behavior used to specify The the credentials of a service This class is useful for accessing client security information, such as the user s Windows authentication settings, and client certi cates It s implemented as a behavior so that it can inspect incoming messages for their security information attribute of an operation behavior enables imperThe sonation from the client to the service When impersonation is allowed (or required), client credentials that are passed in the channel are used by the WCF runtime to impersonate the client for the duration of the service operation behavior, scoped at either the service or The operation level, is used to authorize the caller to access the service or operthat is ation Using this behavior, you can set an responsible for inspecting claims that the user presents and determining whether to grant access to the service behavior is accessible in the The section of a con guration le and determines what, if any, information is automatically logged with each service request If not de ned, no audit information is logged
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Behaviors are a fundamental extensibility point in the WCF architecture They are used when the client or service runtime is being constructed and with each service call When the runtime starts, it looks for behaviors or by inspecting the type structures passed into the , and then looks in con guration les Behaviors can also be object before opende ned in code and added to the , or in code by using attributes, or in con guration les ing the Behaviors implement inspectors code that inspects objects presented to them There are message inspectors that work at the message level and
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parameter inspectors that work on operation parameters At the operation level, behaviors are involved with selecting which method to invoke to run for a given SOAP input message and again to invoke that method Behaviors control the instancing and concurrency of service classes and settheir operations Instancing is controlled by the , , or Concurrency is controlled ting and can be setting and can be or by the (single, but thread-safe code) Together, these two settings control the level of concurrency of a service, from a singleton on one end of the spectrum to creating a new instance per call on the other end Service behaviors also enable you to throttle the number of concurrent calls, instances, or sessions behavior This One important service behavior is the model in behavior exposes the WCF type system and WSDL so that clients know the where, how, and what to communicate with endpoint uses the WS-MEX a service More generally, the protocol so that it can communicate with clients on different platforms and return metadata information in a variety of formats Only if a service includes this behavior will it expose WSDL This is a different experience from what many developers are used to with ASMX, which exposes WSDL by default WCF implements short-lived, ACID-style transactions in behaviors Transactions can exist within a service or can ow across service boundaries Transactions are implemented at the operation behavior level, although certain conditions must be met at the endpoint and service level For instance, to ow transactional context from the client to the service, the service endpoints must use a protocol that supports sessions, such as Sessions must be allowed at the service level to ow transactions across service boundaries Operation behaviors enable developers to specify the isolation level of transactions, and administrators can control the timeout properties WCF supports three transaction managers, one for local transactions within a process, one for Vista-only resources, and the Distributed Transaction Coordinator In addition, communication across service boundaries can use either a Windows-only transaction protocol that leverages RPC, or it can use the standards-based WS-AT protocol
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