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The return value has an XmlElement attribute which specifies that the return element s name is MyMessageResult The method implementation is very similar to what you saw above: It calls Invoke on the base class passing it the method name and an array of input parameters (an empty array in this case) and gets back an array that contains the return value The next interesting method is ParamStyleTest This Web method is defined to use the Bare parameter style which means that each method parameter will be represented by a child element of <soap:Body> The auto-generated proxy reflects this by setting the ParameterStyle property of SoapDocumentMethod to Bare and by also adding XmlElement attribute on each of the parameters and the return value Finally, OneWayMethod has the SoapDocumentMethod s OneWay property set to True just like on the service side At runtime, this property means that no response should be expected Without this property on the client side, the client would look for a SOAP response message and would throw an exception when it doesn t get one
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Summary
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The NET Framework provides a rich set of classes and tools for building and consuming Web services and Visual Studio NET makes it even easier In this you learned how to create NET Web services and how to customize the Web service s WSDL to meet your needs You also learned how NET Web service clients are generated and how they work The next two chapters build on this knowledge to show you how to perform advanced tasks such as utilizing SOAP headers and interface-based Web services development
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[1] Double thanks to Simon Fell for making this possible First, thanks for creating ProxyTrace and giving it away for free Second, thanks for letting me include it on the book s CD Please be sure to visit his site at wwwpocketsoapcom where he also publishes a free implementation of SOAP for the PocketPC [2] By default session state is stored in-process While this gives you great performance, it prevents you from creating a Web server farm to scale out with increased application load ASPNET solves this problem by letting you optionally store session information on a dedicated server using either a Windows service or a back-end SQL Server database This is useful when your Web services are running on a Web server farm [3] You can use Web Services Studio for testing Web services instead of the auto-generated test page This free tool, available on GotDotNet, lets you easily send a SOAP request to a Web service and view the response Download it Web Services Studio from wwwGotDotNetcom
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In 3 you learned how SOAP headers can be used to extend SOAP by including information in the SOAP message outside of the message payload Applications of SOAP headers include custom session keys (when your application is managing its own sessions), security keys, and digital signatures NET makes it easy to send and receive SOAP headers by providing a framework of objects that you use to define your headers then specify which Web methods will use those headers In this chapter you will learn how to implement SOAP headers with NET to send additional information between client and service You ll also learn to communicate error information in a rich, standard way using SOAP Fault elements
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The first step in using SOAP headers is to define a class that represents the header you want to send or receive This class must inherit from the base class SystemWebServicesProtocolsSoapHeader and add public members that represent the header information you need Listing 7-1 shows two classes that represent two different SOAP headers each with two public fields
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Listing 7-1 Two SOAP header classes (VBWSBook\7\DataServiceasmxvb)
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Public Class HeaderClass1 Inherits SoapHeader Public field1 As Integer Public field2 As String End Class Public Class HeaderClass2 Inherits SoapHeader Public fielda As Integer Public fieldb As String End Class
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Because your SOAP headers are simply classes, they could also contain properties and methods In addition, you can use XML serialization attributes such as XmlElement and XmlArrayItem to control how public members of your header classes get serialized into SOAP messages
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