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"http://tempuriorg/" Then unknownHeaderDidUnderstand = True Else unknownHeaderDidUnderstand = False End If Next End Sub
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On the client side, the proxy looks like the one in listing 7-10 indicating that theSession header should be sent with calls to this Web method
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Listing 7-10 Proxy class for invoking DoYouUnderstand (VBWSClientCode\7\CustomClient\Web References\VBWSServer1\Referencevb)
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'The following SoapHeaderAttribute 'was added manually <SoapHeaderAttribute("theSession"), _ SoapDocumentMethodAttribute("http://tempuriorg/DoYouUnderstand")> _ Public Sub DoYouUnderstand() MeInvoke("DoYouUnderstand", New Object(-1) {}) End Sub
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The client code is in listing 7-11 The client first instantiates the Web service proxy and sets theSession member variable as you saw above In addition, the client sets theSession s MustUnderstand property to True MustUndertand is another property of SoapHeader that the client uses to tell the service it has to understand this header
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Listing 7-11 Client code using proxy class in listing 7-10 (VBWSClientCode\7 \CustomClient\Form1vb
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Private Sub Button9_Click( _ ByVal sender As SystemObject, _ ByVal e As SystemEventArgs) _
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Handles Button9Click Dim ws As New localhost1DataService() wstheSession = New localhost1SessionInfo() wstheSessionLastUsed = DateTimeNow wstheSessionSessionId = "abcbdef1234e" 'the service must understand this header wstheSessionMustUnderstand = True Try wsDoYouUnderstand() Catch ex As Exception MessageBoxShow(exMessage) End Try End Sub
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If the service doesn t understand a header that has soap:mustUnderstand= 1 , a <soap:Fault> is automatically returned which is translated to an exception on the client side The Catch block in listing 711 will display this exception in a message box as shown in figure 7-2
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Figure 7-2 A SoapHeaderException is thrown indicating that the service did not understand a header marked with mustUnderstand= 1
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SOAP provides a standard mechanism for reporting error information using the <soap:Fault> element which was discussed in 3 When using NET, any exceptions not caught in the Web method get reported to the client as a <soap:Fault> Similarly, NET clients throw a SoapException whenever they receive a
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<soap:Fault> In the simplest case, you can communicate errors from a service by throwing an exception, for example:
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Throw New Exception("This is the error information ")
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For more sophisticated scenarios, you can send structured error information as XML elements inside <soap:Fault> To do this you create a new SoapException and pass it an array of XML elements that you want to send to the client SoapException has 6 overloaded constructors two of which take in an XML node that represents the returned <detail> element For example:
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Public Sub New( ByVal message As String, _ ByVal code As SystemXmlXmlQualifiedName, _ ByVal actor As String, _ ByVal detail As SystemXmlXmlNode)
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The first parameter, message, is the error message that you want to send This string gets sent as the text of the <faultstring> element The second parameter is the value of <faultcode>, it can be any namespacequalified name The code value is usually the standard soap:Client and soap:Server codes, which you can send by passing in SoapExceptionClientFaultCode or SoapExceptionServerFaultCode as the value of the code parameter actor is a string that indicates the SOAP node which is sending this fault information You usually set actor to an empty string unless you have a chain of Web services and you want to indicate which service within that chain is sending the error The detail parameter is an XML element that represents the <detail> child of <soap:Fault> According to the SOAP specification, you re allowed to send a <detail> element only if the error occurred while processing the contents of <soap:Body> If however an error occurred while processing a SOAP header, it is illegal to send a <detail> element In that case you throw a SoapHeaderException which works very similarly to SoapException except it doesn t have a detail property
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Listing 7-12 shows an example Web method that receives an invoice document (the one from 2), validates it using the invoice schema and returns detailed error information by calling another method that throws a SoapException
Listing 7-12 An example method that receives an invoice document (VBWSBook\7 \CustomWSasmxvb)
<WebMethod()> _ Public Sub ReceiveInvoice(ByVal inv As XmlNode) 'validate the invoice Dim proc As New InvoiceProcessor() Try