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contains only the input parameter as a direct child of the SOAP <Body> element In this case, we want the request message to contain one element named TemperatureRequest, therefore I added an XmlElement attribute on the ZipCode parameter to set the element name to TemperatureRequest Similarly, the return value will be represented as an element contained directly within the response message s <Body> element We want this element to be called Temperature per the schema in listing 13-1, so I used another XmlElement attribute on the return value to specify Temperature as the element name The GetWeather Web method has the same SoapDocumentMethod attribute This time, the ZipCode parameter is serialized to an element named WeatherRequest and the returned CurrentWeather object is serialized to an element named CurrentWeather Getting Weather Information The National Weather Service (NWS) exposes current weather information via FTP and HTTP (at weathernoaagov) To make it easy for you to retrieve Weather information, I created a class named WeatherInfo that uses HTTP to get the weather from NWS s Web site To get weather information for a specific location, you must know the weather station id corresponding to that location Realistically, most people don t know their weather station id, therefore this service needs a way to translate a US postal zip code to a weather station id I did some digging and data mining and created a database table that provides this mapping Although it has close to 35,000 records, the table does not contain all current zip codes This should not be a problem since the main purpose of this exercise is to illustrate the process of building Web services by building a live Web service So don t expect that the Web service built in this chapter will use production-class data
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Going back to listing 13-3, you ll notice that both GetTemperature and GetWeather rely on the WeatherInfo class to get current weather information WeatherInfo exposes two shared (static) methods named GetTemperatureFromZip and GetWeatherFromZip Internally, both methods retrieve complete weather information but GetTemperature returns only the temperature and ignores the rest of the information You ll find the WeatherInfo class in the file named WeatherInfovb
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LogOn and LogOff To prepare for implementing security, we ll need to implement two additional Web methods named LogOn and LogOff as shown in listing 13-4 Each of LogOn and LogOff uses shared methods of a class named SessionMgr to do the real work (SessionMgr is part of the security infrastructure built in chapter 10 See chapter 10 for more information on the SessionMgr class) LogOff is an especially interesting method for two reasons First, it doesn t return any value; therefore it s a Sub not a Function Second, when a client calls LogOff, it will probably won t be interested in finding out whether this LogOff succeeded or not Consider a client that is being shutdown, it might fire off a LogOff request as it is shutting down The last thing the client needs is to wait for a response to come back To make things easier for clients, I marked this method as one-way by setting the OneWay property to True This means the corresponding WSDL operation will have an input message but won t have an output message
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Listing 13-4 Adding LogOn and LogOff methods for authentication (VBWSBook\13 \Weatherasmxvb)
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<WebMethod(), _ SoapDocumentMethod( _ Binding:="WeatherInterface", _ Action:="", _ RequestElementName:="LogOnRequest", _ ResponseElementName:="NewSession")> _ Public Function LogOn(ByVal UserId As String, ByVal Password As String) _ As <XmlElement("SessionId")> String 'implementation coming in a later section End Function
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<WebMethod(), _ SoapDocumentMethod( _ Binding:="WeatherInterface", _ OneWay:=True, _ Action:="", _ RequestElementName:="LogOffRequest", _ ParameterStyle:=SoapParameterStyleBare)> _ Public Sub LogOff(ByVal SessionId As String) 'implementation coming in a later section End Sub
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The RequestElement-Bare Dilemma Looking at the LogOn method in listing 13-4, you ll notice that the ParameterStyle property is missing from the SoapDocumentMethod attribute hence the default (which is SoapParameterStyleWrapped) will apply This means that parameters will be wrapped in a request element and the return value will be wrapped in a response element The reasons why I had to do this are explained in the next few paragraphs When you tell NET to ignore the SOAPAction header (by setting RoutingStyle to RequestElement), you are essentially relying on the request element s name to identify which method should be invoked So each request must have exactly one element as a direct child of <Body> and that element must have a unique name for each Web method on your service
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