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Web services are self-describing, which means ASPNET automatically provides all the information the client needs about what methods are available and what parameters they require This is provided by the XML-based standard called WSDL, which you ll explore in the next chapter However, although a WSDL document describes the mechanics of the web service, it doesn t describe its purpose or the meaning of the information supplied to and returned from each method Most web services will provide this information in separate developer documents However, you can (and should) include a bare minimum of information with your web service by using the WebMethod and WebService attributes You can add descriptions to each method through the Description property of the WebMethod attribute and to the entire web service as a whole using the Description property of the WebService attribute.

You can also apply a descriptive name to the web service using the Name property of the WebService attribute Here s an example of how you might insert this information in the EmployeesService: [WebService(Name="Employees Service", Description="Retrieve the Northwind Employees")] public class EmployeesService : SystemWebServicesWebService { [WebMethod(Description="Returns the total number of employees")] public int GetEmployeesCount() { .. } [WebMethod( Description="Returns the full list of employees")] public DataSet GetEmployees() { .. } } These custom descriptions are added to the WSDL document that describes your service It s also shown in the automatically generated test page that you ll use in the next section You should supply one other detail for your web service a unique XML namespace This allows your web service (and the XML messages it generates) to be uniquely identified XML namespaces were first introduced in 12 By default, ASP.

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NET web services use the default XML namespace http://tempuriorg/, which is suitable only for testing If you don t set a custom namespace, you ll see a warning message in the test page advising you to use something more distinctive Note that the XML namespace has no relationship to the concept of NET namespaces It doesn t affect how your code works or how the client uses your web service Instead, the XML namespace simply identifies your web service XML namespaces usually look like URLs However, they don t need to correspond to a valid Internet location..

A standard date, without any time information associated with it Most databases should have a date column type, so this should be easy to support Just make sure that the column type used returns a Python upon retrieval A date, but with associated time information attached, excluding time zones Again, most reasonable databases will support this easily, but make sure that the Python library for it returns a when retrieving from the database A fixed-precision decimal number This is another example of using field attributes to define the database column, since the and field attributes should control the database column equivalents The name and location of a file stored elsewhere Django doesn t support storing files as binary data in the database, so its files are referenced by a relative path and name, which is stored in the associated column.

Ideally, the namespace you use will refer to a URL address that you control. Often, this will incorporate your company s Internet domain name as part of the namespace. For example, if your company uses the website http://www.mycompany.com, you might give the Employees web service a namespace such as http://www.mycompany.com/EmployeesService. The namespace is specified through the WebService attribute, as shown here: [WebService (Name="Employees Service", Description="Retrieve the Northwind Employees", Namespace="http://www.apress.com/ProASP.NET/")] public class EmployeesService : System.Web.Services.WebService { ... }

Now that you ve seen how to create a simple web service, you re ready to test it. Fortunately, you don t need to write a client application to test it because .NET includes a test web page that ASP.NET uses automatically when you request the URL of an .asmx file in a browser. This page uses reflection to read and show information about the web services, such as the names of the methods it provides. To try the test page, request the EmployeesService.asmx file in your browser. (In Visual Studio, you simply need to set this as the start page for your application and then run it.) Figure 32-3 shows the test page you ll see.

Figure 32-3. The web service test page Note that the page displays the two web methods with their descriptions, and the page s title is the name of the web service. If you click one of the methods, you ll see a page that allows you to test the method (and supply the data for any method parameters). Figure 32-4 shows the page that allows you to test the GetEmployeesCount() method.

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