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practices The Enterprise Library is a free collection of integrated libraries of code, called application blocks, which can be used to quickly implement proven practices into an application The latest release of the Enterprise Library (currently version 31) includes new features that integrate with some of the capabilities of the NET Framework 30 and 35 One of the application blocks contained in the Enterprise Library, called the Exception Handling Application Block, can be used to de ne policies for handling exceptions within an application For example, you may create a policy where all data-related exceptions are is rethrown in the original exception s logged and a new, generic place
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Full coverage of the Enterprise Library as it relates to NET 3x is beyond the scope of this book, but details can be found at http: //msdncom/practices
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Exception Shielding The latest release of the Enterprise Library extends the functionality of the Exception Handling Application Block to provide a feature called exception , that can be used shielding It features a new attribute, to invoke an exception policy when a service is accessed Used in conjunc, you can fairly easily contion with the vert NET exceptions thrown by your operations into strongly typed instances related to a target data contract In addition to the other handlers such as wrap, replace, and logging, the , based on con guration, can be used to perform a elded mapping between a thrown exception and the data conattribute tract speci ed with a Consider using exception shielding as a way to catch and convert either all or a speci c subset of exception types that are not already processed using one of the techniques described in this chapter Details and examples of using Enterprise Library for WCF exception shielding can be found on MSDN at http://msdn2microsoftcom/en-us/ library/aa480591aspx
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10: Exception Handling
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In this chapter, we introduced how WCF processes exceptions and the variety of options you have to in uence those operations The rst and perhaps most important was to understand what happens when you do nothing By default, unhandled exceptions may lead to interruptions of sessions and the invalidation of client proxies class is central to creating an Knowing how to use the effective exception-handling strategy and avoiding the potential issues is helpful for associated with unhandled exceptions abstracting the details of the SOAP fault schema and how WCF converts exception information into that schema for transmission to callers You saw can be extended to provide detailed codes and reathat sons, even supplying locale-speci c translations of exception messages to support a localized client application s, we moved on to From unhandled exceptions and basic the concept of strongly typed exceptions using the generic By using data contracts to de ne data structures for conveying exception information, client applications can include effective type-driven exceptionhandling code without the need to parse individual instances at runtime to determine the correct course of action Use of the attribute enables proxy-generation tools to analyze a service s WSDL to create strongly typed representations of the source data contracts, regardless of the technology used by the client Finally, we introduced the concepts behind the WCF integration found in the Enterprise Library s Exception Handling Application Block This enables you to easily create policies for handling exceptions at your services boundaries Having a well-de ned and understood exception-handling strategy in your team, group, or company is of critical importance As you create your WCF services and client applications, take the time to consider the mechanisms by which you ll ensure that your service will behave predictably while also enabling the development of robust and maintainable clients
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