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} catch { if (con.State != ConnectionState.Closed) con.Close(); ContextUtil.SetAbort(); } finally { con.Close(); } } Does a web service need to use COM+ transactions It all depends on the situation. If multiple updates are required in separate data stores, you may need to use transactions to ensure your data s integrity. If, on the other hand, you re modifying values only in a single database (such as SQL Server 2000), you can probably use the data provider s built-in transaction features instead, as described in 7.

In the future, other emerging standards, such as XLANG and WS-Transactions, may fill in the gaps by defining a cross-platform standard that will let different web services participate in a single transaction. However, this goal is still a long way from being realized.

Summary

The examples shown in this section are all for new-style classes, which, as described earlier in this chapter, will behave differently from old-style classes, especially with regards to introspection. The exact differences are beyond the scope of this book, since the usual recommendation is to simply use new-style classes. If any of your code seems to behave differently than what s described here, make sure that all your classes inherit from , which will make them into proper new-style classes.

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In this chapter, you learned what web services are and why they are important for businesses. You also took your first look at how to create and consume web services in .NET and test web services with nothing but a browser. In the next two chapters, you ll dig into the underlying standards and learn how to extend the web service infrastructure.

n the previous chapter, you learned how .NET hides the low-level plumbing of web services, allowing you to create and consume sophisticated web services without needing to know anything about the low-level details of the protocols you re using. This higher-level abstraction is a general theme of modern programming for example, few Windows developers worry about the individual pixels in their business applications, and ASP .NET developers rarely need to write raw markup to the output stream. Of course, sometimes high-level frameworks aren t quite enough. For example, Windows developers creating real-time games just might need to work with low-level video hardware, and web developers creating custom controls will probably need to immerse themselves in a thorny tangle of JavaScript and HTML. The same principle is true of web services. In most cases, the high-level web services model in .NET is all you need. It ensures fast, productive, error-proof coding. Sometimes, however, you need to dig a little deeper. This is particularly true if you need to send complex objects to non-.NET clients or build extensions that plug into the .NET web services model. In this chapter, you ll take a look at this lower level, and learn more about the underlying SOAP and WSDL protocols.

If you re a web service expert looking for new .NET 2.0 features, pay special attention to the Customizing SOAP Messages section toward the end of this chapter. It describes how to control the serialization process with IXmlSerializable and how to create schema importer extensions to allow types that web services wouldn t ordinarily support. Also, look for the Implementing an Existing Contract section that describes how to perform contract-first development with WSDL.

All classes and functions provide a few common attributes that can be used to identify them. The name that was used to declare the class or function The docstring that was declared for the function The import path of the module where the class or function was declared

Web services have developed rapidly, and standards such as SOAP and WSDL are still evolving. In early web service toolkits, different vendors interpreted parts of these standards in different ways, leading to interoperability headaches. Further, some features from the original standards are now considered obsolete. Negotiating these subtle differences is a small minefield, especially if you need to create web services that will be accessed by clients using other programming platforms and web service tool-kits. Fortunately, another standard has appeared recently that sets out a broad range of rules and recommendations and is designed to guarantee interoperability across the web service implementations of different vendors. This document is the WS-Interoperability Basic Profile (see http://www.ws-i.org). It specifies a recommended subset of the full SOAP 1.1 and WSDL 1.1

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