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Listing 6-16 shows the completed CustomWS Web service with the Web methods and attributes discussed in this section
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Listing 6-16 The complete CustomWS Web service (VBWSBook\6\CustomWSasmxvb)
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<SoapDocumentService( _ RoutingStyle:=SoapServiceRoutingStyleSoapAction), _ WebService([Namespace]:="urn:my-unique-namespace", _ Name:="MyWebService", _ Description:="Example of customizing Web services " + _ "Written by <a href='mailto:shohoudy@devxpertcom'>Yasser Shohoud</a>")> _ Public Class CustomWS Inherits SystemWebServicesWebService
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<WebMethod( _ Description:="This method has a custom operation name", _ MessageName:="MyMessage")> _ Public Function CustomMsgName() As Integer
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End Function
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<WebMethod(), _ SoapDocumentMethod(RequestNamespace:="http://xmlwscom/messages")> _ Public Function CustomNS() As Integer
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End Function
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<WebMethod(), _
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SoapDocumentMethod(ParameterStyle:=SoapParameterStyleBare)> _ Public Function ParamStyleTest( _ ByVal a As Integer, ByVal b As String)_ As String
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End Function <WebMethod(), SoapDocumentMethod(OneWay:=True)> _ Public Sub OneWayMethod(ByVal theData As String)
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End Sub End Class
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Now that you know how to create and customize Web services, the next section explains how NET Web service clients work and how you can customize them to meet your needs
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Understanding Web Service Clients
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A Web service proxy class inherits from either HttpGetClientProtocol, HttpPostClientProtocol, or SoapHttpClientProtocol depending on whether it uses HTTP GET, HTTP POST or SOAP to invoke the Web service As I mentioned earlier, HTTP GET and POST are somewhat interesting for quickly testing the service, but any real-world Web service will likely use SOAP which means the Web service proxy will inherit from SoapHttpClientProtocol Figure 6-13 shows the class hierarchy for a Web service proxy, note that SoapHttpClientProtocol inherits from HttpWebClientProtocol which in turn inherits from WebClientProtocol
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Figure 6-13 Inheritance hierarchy for a Web service proxy class The classes at the bottom of the hierarchy are Web service proxies
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A Web service proxy class that uses SOAP inherits from SoapHttpClientProxy Similarly, if the proxy uses HTTP GET or POST, it inherits from HttpGetClientProtocol or HttpPostClientProtocol respectively Each class in this inheritance hierarchy is responsible for a different portion of the task of sending a Web service request and receiving the response For example, HttpWebClientProtocol implements functionality that is specific to HTTP such as the Proxy property explained above On the other hand, SoapHttpClientProtocol exposes an interesting method called Invoke which is responsible for invoking the Web service This method does all the heavy lifting including serializing input parameters, sending the SOAP request, parsing the response and deserializing all output parameters and return value Invoke takes in the name of the method you want to invoke and an array of objects that contains the input parameters (ie the parts of the input message) and returns an array of objects that contains the output parameters and return value (the parts of the output message):
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Protected Function Invoke( _ ByVal methodName As String, _ ByVal parameters() As Object _ ) As Object()
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Note that Invoke is protected which means you can t instantiate a SoapHttpClientProtocol object and call Invoke on it, you must inherit from SoapHttpClientProtocol then call MeInvoke Listing 6-17 shows an example custom proxy that calls the GetServerTime Web method from listing 6-2 Listing 6-17 A proxy class which inherits from SoapHttpClientProtocol and calls the GetServerTime method (VBWSClientCode\6\CustomClient\CustomProxyvb)
Imports SystemWebServicesProtocols Imports SystemWebServices <WebServiceBinding()> _ Public Class CustomProxy Inherits SoapHttpClientProtocol
<SoapDocumentMethod("http://tempuriorg/GetServerTime", _ RequestNamespace:="http://tempuriorg/", _ ResponseNamespace:="http://tempuriorg/")> _ Public Function GetServerTime() As DateTime Dim ret() As Object MeUrl = "http://VBWSServer/vbwsbook/6/DataServiceasmx " ret = MeInvoke("GetServerTime", New Object(-1) {}) Return CType(ret(0), DateTime) End Function
End Class
In listing 6-17, CustomProxy inherits from SoapHttpClientProtocol and adds the GetServerTime method When GetServerTime is called it first sets the base class s Url property to the Web service end point URL then it calls SoapHttpClientProtocolInvoke passing it the Web method name (GetServerTime) and an array of objects This array normally contains an object for each input parameter that the Web method takes It is empty in this case because the Web method takes no parameters The output from this call is an object array which is stored in the variable called ret This array contains the Web method s return value and any returned ByRef parameters In this case the first (and only) item in this array is the method return value which represents the server s time The next line takes this return value out of the array, converts it to a DateTime and returns it You ll notice a SoapDocumentMethod attribute on the GetServerTime proxy method, this is needed so that SoapHttpClientProtocol will know how to form the SOAP request In general, the attributes you use on the service to control the SOAP message can also be used on the client to match the service definition If for example the service defines a one-way method like this: