<%@ WebService Language="vb" Codebehind="Service1asmxvb" Class="6Service1" %> in .NET

Painting European Article Number 13 in .NET <%@ WebService Language="vb" Codebehind="Service1asmxvb" Class="6Service1" %>
<%@ WebService Language="vb" Codebehind="Service1asmxvb" Class="6Service1" %>
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This directive contains the name Service1 twice: In the codebehind file name and in the class name
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Renaming a Web service requires changing all five occurrences of Service1 Unfortunately when you rename an asmx file in VS NET, it will not rename the Web service class nor will it update the class name in the WebService directive Therefore the easiest thing to do when you create a new Web service project is to delete Service1asmx then add a new Web service from the Project menu and specify the service name, eg DataService Then open the code view for DataServiceasmx and you should see a class called DataService and an example HelloWorld method that s commented out To add methods to your Web service, simply add a Function or Sub, like you normally would, making sure it is Public and prefixing it with the WebMethod attribute The WebMethod attribute is what makes your methods accessible as operations on the Web service Listing 6-2 shows an example method that returns the server time
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Listing 6-2 Adding a WebMethod to your Web service (VBWSBook\6\DataServiceasmxvb)
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<WebMethod()> _ Public Function GetServerTime() As DateTime Return SystemDateTimeNow() End Function
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Note that you can put the WebMethod attribute on the same line as the method definition For example this would work just as well: <WebMethod()> Public Function GetServerTime() As DateTime To test your project, first right click on DataServiceasmx and choose Set As Start Page then choose Start from the Debug menu or press F5 to build and run the project This will launch Internet Explorer with the service documentation page which should look like the one in figure 6-4
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Figure 6-4
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The default documentation page which is automatically generated when you navigate to an asmx file with a browser If you then click on the GetServerTime link this will take you to a test page shown in figure 6- 5, where you can click on Invoke to test this operation You should get a new Internet Explorer window with a <dateTime> element that contains the current date and time on the machine where the service is running If you close Internet Explorer, debugging will automatically stop then you can go back and edit the code and rebuild and so on
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Figure 6-5 You can test your Web service methods from this HTML page by clicking Invoke
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The next logical step after creating and testing a Web service is to create a client for that service You can call a Web service from practically any kind of application The rule is: if you can send an HTTP POST request to the Web server, you can invoke the Web service To create a Windows Forms client, start Visual Studio NET and create a new project using the Windows Application template This will create the project file for you and add a form called Form1 As you learned in 1 you can use wsdlexe to create a proxy class that makes it easy to invoke the Web service You can also have VS NET generate this proxy class for you by choosing Add Web Reference from the project menu, which will bring up the dialog shown in figure 6-6 Here you type the Web service URL (eg http://VBWSServer/vbwsbook/6/DataServiceasmx ) and hit enter which will bring up the service documentation page and will enable the Add Reference button on the bottom right Clicking on Add Reference will generate the proxy class and add it to your project By default, this new class belongs to a NET namespace that s taken from the host name where the Web service is located For example, if the Web service is on the VBWSServer, the namespace is simply VBWSServer Similarly if the Web service is at wwwLearnXmlwscom, the namespace is comlearnxmlwswww Examining the project files in Solution Explorer reveals a new folder called Web References that contains within it another folder called VBWSServer as shown on the left in figure 6-7 Switching to Class View shown on the right in figure 6-7, you ll see a namespace called VBWSServer that contains the generated proxy class called DataService (same name as the service)
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