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receives and emits the messages described in listing 13-1
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Implementing the Service
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There are two options for implementing the messages we designed First, you could create a WSDL document using the messages schemas from listing 13-1 then run wsdlexe server on this WSDL to generate a Web service stub implementation If you do this, you are essentially defining the interface first (the WSDL), then implementing it which is exactly what I explained in chapter 8 Alternatively, you can code the Web service directly and use a combination of attributes on the service itself as well as on each Web method to ensure the emitted WSDL adheres to the message specification in listing 13-1 8 already covered the interface-based approach so I will take the second approach here But if you are comfortable enough with WSDL, I recommend you try the first approach at least once for this Web service just to get a feel for it Generating Classes from Complex Types First thing we ll do is generate classes that correspond to complex types in service messages In this example, only the CurrentWeather element has a complex type To generate a class that corresponds to this type, you run xsdexe with the /classes option Since you want to generate a class for one of the elements in the schema (rather than classes for all elements in the schema), you specify the element name and namespace with the /e and /u options respectively
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xsdexe /classes /e:CurrentWeather /u:http://wwwlearnxmlwscom/WeatherService /l:vb WeatherMessagesxsd
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This generates a class named CurrentWeather in a file named WeatherMessagesvb I renamed this file to Messagesvb and removed from it the namespace prefix SystemXmlSerialization because this namespace is already imported at the top of the file The resulting class, in listing 13-2, contains a public field for each element defined in the complex type We will use this class to return weather information from the GetWeather operation Listing 13-2 A class generated by xsdexe from the CurrentWeather element schema (VBWSBook\13\Messagesvb)
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<XmlTypeAttribute( _ [Namespace]:="http://wwwlearnxmlwscom/WeatherService"), _ XmlRootAttribute( _ [Namespace]:="http://wwwlearnxmlwscom/WeatherService", _ IsNullable:=False)> _ Public Class CurrentWeather Public Temperature As Single Public Conditions As String Public IconUrl As String
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Writing the Service Code Now you actually get to write some code Start by creating a Web service project then add to it the CurrentWeather class that was previously generated Then add a Web service named Weather Open the code view for this Web service and add Import statements for SystemWebServicesProtocols and SystemXmlSerialization namespaces This service should ignore SOAPAction as specified in the requirements section, therefore add to the Web service class a SoapDocumentService attribute and set its RoutingStyle property to SoapServiceRoutingStyleRequestElement By default, there should be a WebService attribute on the Web service class Modify the namespace property of this attribute to http://wwwlearnxmlwscom/WeatherService In this particular example, I chose to add a WebServiceBindingAttribute and specify the binding s name and namespace as shown in listing 13-3 This is because the Web service s binding will be registered with UDDI as a tModel and I wanted it to have a more descriptive name than the standard WeatherSoap To implement the GetTemperature operation, simply create a function named GetTemperature that takes in a Sring parameter and returns a Single as in listing 13-3
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Listing 13-3 A Web Service implementing the pre-defined messages (VBWSBook\13 \Weatherasmxvb)
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<SoapDocumentService( _ RoutingStyle:=SoapServiceRoutingStyleRequestElement), _ WebService(Namespace:="http://wwwlearnxmlwscom/WeatherService"), _ WebServiceBindingAttribute("WeatherInterface", _ "http://wwwlearnxmlwscom/WeatherService ")> _ Public Class Weather Inherits SystemWebServicesWebService
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'Note that we don't want to use SoapAction 'so NET relies on request element name 'so if we use Bare we must ensure there's only one parameter 'And that parameter name must be unique
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<WebMethod(), _ SoapDocumentMethod( _ Binding:="WeatherInterface", _ Action:="", _ ParameterStyle:=SoapParameterStyleBare)> _ Public Function GetTemperature( _ <XmlElement("TemperatureRequest")> ByVal ZipCode As String) _ As <XmlElement("Temperature")> Single Return WeatherInfoGetTemperatureFromZip(ZipCode) End Function
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<WebMethod(), _ SoapDocumentMethod( _ Binding:="WeatherInterface", _ Action:="", _ ParameterStyle:=SoapParameterStyleBare)> _ Public Function GetWeather( _ <XmlElement("WeatherRequest")> ByVal ZipCode As String) _ As <XmlElement("CurrentWeather")> CurrentWeather Return WeatherInfoGetWeatherFromZip(ZipCode) End Function End Class
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In addition to the WebMethod attribute, this function also has a SoapDocumentMethod attribute which is used to control various aspects of the operation The binding property specifies that this operation is part of the WeatherInterface binding defined earlier The Action property specifies that the SOAPAction should be an empty string I expected that setting the service s RoutingStyle to RequestElement meant the Web service would not require a SOAPAction But it turns out that SOAPAction is still required, but its value is ignored The only reason I set it to an empty string here is to make it clear to you that the value of SOAPAction does not matter Finally, the ParameterStyle property is set to SoapParameterStyleBare meaning the ZipCode parameter and the return value will not be wrapped in an additional XML element This setting works with the XmlElement serialization attributes on the ZipCode parameter and the return value to form the correct request and response message according to the schema in listing 13-1 As a result, the request element
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