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Process generic messages. Handle exceptions on clients.
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Lessons in this chapter:
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Lesson 1: Dealing with POX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 413 Lesson 2: Handling Exceptions in the Client . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 427
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Before You Begin
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To complete the lessons in this chapter, you must have: A computer that meets or exceeds the minimum hardware requirements listed in the introduction at the beginning of the book. Any edition of Microsoft Visual Studio 2008 (including Microsoft Visual C# 2008 Express edition or Microsoft Visual Basic 2008 Express edition) installed on the computer.
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9
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When Simple Isn t Sufficient
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Real World
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Bruce Johnson In the real world, I find the majority of my time is spent trying to solve challenging problems. I am asked about obscure parts of the .NET Framework, such as how to invoke the parameterless constructor on a generic collection. I have clients who want to find ways to make a .NET application communicate with an ActiveX control when the .NET application is multithreaded and the ActiveX control must be hosted on a form. In other words, I spend an inordinate amount of time trying to make .NET do things that, I suspect, the designers never expected to be done. While working in this mode, I find WCF to be incredibly useful. If you want to communicate between AppDomain instances or processes or even across computers, WCF is the way to go. Test communications locally and then deploy across distributed computers and know that it will work. Need to process incoming messages in which the format cannot be guaranteed up front WCF has a way to make it happen. If the problem involves communications, odds are pretty good that WCF can help. I don t expect that the information provided in this chapter will be immediately useful for everyone, but if you read this chapter with an eye to how the information might help in the future, you will find that, someday, your recall of one of these topics will save you a great deal of time and energy.
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Lesson 1: Dealing with POX
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Lesson 1: Dealing with POX
Plain old XML (POX) is not going away anytime in the near future. There is, and will continue to be, the need to create services that receive an arbitrary message in the form of an XML document. Based on some information in the XML, the service will route the XML to another destination, which could be a method within the service. The XML could be sent on to another service or back-end server. Regardless of the details, the service needs to be able to examine the message without knowing at the outset exactly how it is structured. This lesson explains how to handle POX requests in a WCF application.
After this lesson, you will be able to: Identify the different types of transport security provided by WCF. Determine which bindings are capable of supporting transport security. Modify configuration details on the implemented transport security. Estimated lesson time: 25 minutes
Untyped Messages
Many clients cannot create a SOAP-formatted message. Web browsers, for example, do not have native support for SOAP-based protocols. They are incapable (outside of using some JavaScript functions) of performing anything other than an HTTP-GET request. In situations like this, the request appears as a formatted string or as XML. POX is also useful when the requests arrive over Hypertext Transfer Protocol (HTTP) and there are no requirements for any WS-* functionality. Requests based on the Representational State Transfer (REST) architecture can provide the information required in the Uniform Resource Locator (URL) that is passed to the service. In both cases, the service must be able to accept the message, regardless of the format, and process it manually. Processing might involve parsing the contents into local objects, determining which operation should be called, and invoking the appropriate method. This lesson discusses the details of how to handle generic, or untyped, messages in WCF.
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