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Using this WSDL document, the SOAP Toolkit will dynamically generate a proxy You can t see the proxy (because it s created at runtime), but you can use it to have access the same higher-level web services model The following example rewrites the ASP page to use the SOAP Toolkit In this case, the WSDL document is retrieved directly from the web server To improve performance, it s recommended that you save a local copy of the WSDL file and use that to configure the SoapClient object <script language="VBScript" runat="Server"> Option Explicit Dim SoapClient Set SoapClient = CreateObject("MSSOAPSoapClient" ' Generate a proxy Dim WSDLPath WSDLPath = "http://localhost/WebServices1/EmployeesServiceasmx WSDL" SoapClientMSSoapInit WSDLPath ' Read the number of employees Dim numEmp numEmp = SoapClientGetEmployeesCount() ResponseWrite(numEmp & " employee(s) in London") </script> Notice that in this example, you have no need to read any XML.

Instead, the client calls the GetEmployeesCount() method directly using the SoapClient object However, this approach still won t help you manipulate a DataSet, because a COM equivalent for this class doesn t exist Instead, you ll need to fall back on parsing XML, as shown in the previous example..

When retrieving the value of an attribute ( ), this method will be called instead, allowing the descriptor to do some extra work before returning the value. In addition to the usual representing the descriptor object, this getter method receives two arguments. The instance object containing the attribute that was referenced. If the attribute was referenced as an attribute of a class rather than an instance, this will be . The class where the descriptor was assigned. This will always be a class object.

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Of course, Java, C++, Delphi, and so on, have their own components, libraries, and APIs to establish HTTP connections, send commands, and parse XML text, but the essential approach is the same.

The basic if command evaluates a list of one or more commands and executes a list if the execution of <condition list> is successful: if <condition list> then <list> fi Usually, the <condition list> is a single command, very often test or its synonym, [. In Listing 3-1, the -z operand to test checks whether a name was entered. Listing 3-1. Read and Check Input read name if [ -z "$name" ] then echo "No name entered" >&2 exit 1 ## Set a failed return code fi

So far you ve seen how to create a basic web service with a couple of methods and create a web page and Windows application that use it. However, we haven t touched on a number of web service features yet. For example, a web method can cache data, use session state, and perform transactions. In the remainder of this chapter, you ll look at how you can use these techniques. The secret to applying these features is the WebMethod attribute. So far the examples you ve seen have used the WebMethod attribute to mark the methods you want to expose as part of a web service and to attach a description (using the Description property). However, several additional WebMethod properties exist, as described in Table 32-6. Table 32-6. Properties of the WebMethod Attribute

The method s description. The alias name for the method, which is used if you have overloaded versions of the method or if you want to expose the method with a different name. This technique is deprecated. This is the number of seconds that the method s response will be maintained in cache. The default is zero, meaning it s not cached. Gets or sets whether the method can access information in the Session collection. Gets or sets whether the method s response is buffered. It is true by default, and it should be set to false only if you know that the request will take long to complete and you want to send sections of data earlier. Gets or sets whether the method supports transaction and of what type. Allowed values are disabled, NotSupported, Supported, Required, and RequiresNew. Because of the stateless nature of web services, they can participate only as the root object of a transaction.

As you learned in 11, ASP.NET has built-in support for two types of caching: output caching and data caching. Web services can use both these forms of caching, as you ll see in the following sections.

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