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Listing 7-4 An example proxy class that calls a Web service with SOAP headers (VBWSClientCode\7 \CustomClient\Web References\VBWSServer1\Referencevb)
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Public Class DataService Inherits SoapHttpClientProtocol Public HeaderClass1Value As HeaderClass1 Public HeaderClass2Value As HeaderClass2
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<SoapHeaderAttribute("HeaderClass2Value", _ Direction:=SoapHeaderDirectionOut)> _ Public Sub ReturnHeader() MeInvoke("ReturnHeader", New Object(-1) {}) End Sub
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<SoapHeaderAttribute("HeaderClass1Value")> _ Public Function ProcessHeader() As String Dim results() As Object = _ MeInvoke("ProcessHeader", New Object(-1) {}) Return CType(results(0), String) End Function End Class
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<XmlRootAttribute( _ [Namespace]:="http://tempuriorg/", IsNullable:=False)> _ Public Class HeaderClass1 Inherits SoapHeader Public field1 As Integer Public field2 As String End Class
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<XmlRootAttribute( _ [Namespace]:="http://tempuriorg/", IsNullable:=False)> _ Public Class HeaderClass2 Inherits SoapHeader Public fielda As Integer Public fieldb As String End Class
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The proxy class in listing 7-4 has two member variables that represent the two headers used by the Web service The classes HeaderClass1 and HeaderClass2 are both automatically generated and placed at the bottom of the file Each Web method that uses headers, eg ReturnHeader, has a SoapHeaderAttribute that mimics the one on the service side except it uses the names of the member variables defined on the client, ie HeaderClass1Value and HeaderClass2Value Although the Required property is not set for each SoapHeaderAttribute in this example, the default is True SoapHttpClientProtocol is smart enough to recognize when the client does not send a required input header and will throw an exception without even attempting to send the SOAP request to the service Listing 7-5 shows how a client can use this proxy to send and receive SOAP headers
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Listing 7-5 A client that uses the proxy class in listing 7-4 (VBWSClientCode\7 \CustomClient\Form1vb)
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Private Sub Button6_Click( _ ByVal sender As SystemObject, _ ByVal e As SystemEventArgs) Handles Button6Click Dim ws As New vbwsserver1DataService() Dim theheader As New vbwsserver1HeaderClass1() theheaderfield1 = 77 theheaderfield2 = "some information the service needs" wsHeaderClass1Value = theheader MessageBoxShow(wsProcessHeader()) End Sub
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Private Sub Button7_Click( _ ByVal sender As SystemObject, _ ByVal e As SystemEventArgs) Handles Button7Click Dim ws As New vbwsserver1DataService() wsReturnHeader() Dim msg As String msg = "The header that came back contains """ + _ wsHeaderClass2ValuefieldaToString() + _ """ and """ + wsHeaderClass2Valuefieldb + """" MessageBoxShow(msg) End Sub
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The first procedure, Button6_Click calls ProcessHeader which expects an input SOAP header To send this header, the first step is to instantiate an object, in this case called theheader, from localhost1HeaderClass1 Note that vbwsserver1 is the namespace in which VS put the proxy code Next, you set the new header object s properties with the information you want to send in this header You then tell the proxy about this header object by setting the proxy s member variable HeaderClass1Value to theheader When you call ProcessHeader, the header object will be automatically serialized and included in the request message Button7_Click calls ReturnHeader which returns a SOAP header The returned header is deserialized and stored in the proxy s HeaderClass2Value member variable so you can get to the header information by simply reading the properties of this variable The example code in listing 7-5 calls ReturnHeader then reads HeaderClass2Valuefielda and HeaderClass2Valuefieldb and displays them in a message box
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So far you ve seen how a service can declare the headers it expects and how a client can send it those headers It s possible for a client to send headers to the service that the service didn t know about at design time If this happens, the service will most likely not care about those headers since it doesn t know what to do with them to begin with However, you might have a scenario where you want to retrieve those headers and log them or otherwise process them What you need is a catch- all member variable that can be used to access all unknown headers This member variable must be either a single instance or an array of SoapUnknownHeader A single instance will capture the first unknown header while an array will capture all unknown headers You then add a SoapHeaderAttribute with this member variable s name to each method where you want to access unknown headers Listing 7-6 shows an example of this
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Listing 7-6 A Web method that reads all SOAP headers from the request message (VBWSBook\7 \DataServiceasmxvb)
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