Basic Web Services
OBJECTIVES
This chapter covers the following Microsoft-specified objective for the "Creating and Managing Microsoft Windows Services, Serviced Components, .NET Remoting Objects, and XML Web Services" of the "Developing XML Web Services and Server Components with Microsoft Visual C# .NET and the Microsoft .NET Framework" exam:
Create and consume an XML Web service.
One of the major advances of Visual Studio .NET over previous versions of Visual Studio is its support for XML Web services. As you'll learn in this chapter, XML Web services enable the use of remote objects over common Internet protocols. This objective tests your ability to use Visual Studio .NET to create a Web service, and to use objects that are made available by a Web service created by another developer.
This chapter also covers the following Microsoft-specified objectives for the "Deploying Windows Services, Serviced Components, .NET Remoting Objects, and XML Web Services" section of the "Developing XML Web Services and Server Components with Microsoft Visual C# .NET and the Microsoft .NET Framework" exam:
Publish an XML Web Service.
The exam also tests your familiarity with the publishing side of Web services. Publishing a Web service makes its objects and methods publicly available. By using Web services protocols such as WSDL and UDDI, you can make your Web service available to other developers for use in their own applications.
OUTLINE
Introduction Understanding Web Services SOAP Disco and UDDI WSDL Invoking Your First Web Service
Creating Web Services Creating a Web Service Project Testing the Web Service Project
Customizing the WebMethod Attribute Discovering Web Services Disco and UDDI Using the Web Services Discovery Tool (disco.exe)
Instantiating and Invoking Web Services Creating Proxy Classes With the Web Services Description Language Tool (wsdl.exe) Using Web References Testing a Web Service
Chapter Summary Apply Your Knowledge
STUDY STRATEGIES
Use ASP.NET to create a simple Web service. Then use the wsdl.exe tool to create a proxy class for that Web service, and instantiate the Web service within another ASP.NET application. Make sure you understand how to make all of the pieces of the process work together. Use the registry at www.uddi.org to explore some available Web services. If you're reviewing references on Web services to study for the exam, make sure that they're specifically about Microsoft's approach to Web services. Although Web services are broadly interoperable between manufacturers, there are implementation differences. Use a tool such as the .NET WebService Studio to inspect SOAP messages and WSDL files to see what's happening as you interact with a Web service.
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