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When deserializing, the input stream contains the XML to deserialize, and the pointer is at the beginning of the stream The LogInputMessage() method copies the input stream into the memory stream buffer and logs the contents of the stream It sets the pointer to the beginning of the memory stream buffer so that the next extension can get access to the stream private void LogInputMessage(SoapMessage message) { CopyStream(oldStream, newStream); messageStreamSeek(0, SeekOriginBegin); LogMessage(message, newStream); messageStreamSeek(0, SeekOriginBegin); } When serializing, the serializer writes to the memory stream created in ChainStream() When the LogOutputMessage() function is called after serializing, the pointer is at the end of the stream The LogOutputMessage() function sets the pointer to the beginning of the stream so that the extension can log the contents of the stream.

In many cases, you don t need to worry about the SOAP serialization details. You ll be happy enough to create and consume web services using the infrastructure that .NET provides. However, in other cases you may need to extend your web services to use custom types or serialize your types to a specific XML format (for cross-platform compatibility). In the following sections, you ll see how you can control these details.

Before returning, the content of the memory stream is copied to the outgoing stream, and the pointer is then back at the end of both streams..

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Once you ve cast the previous page to the appropriate page type, you still won t be able to directly access the control values. That s because the controls are declared as protected members. You can handle this by adding properties to the page class that wrap the control variables, like this: Public ReadOnly Property FirstNameTextBox() As TextBox Get Return txtFirstName End Get End Property Public ReadOnly Property LastNameTextBox() As TextBox Get Return txtLastName End Get End Property However, this usually isn t the best approach. The problem is that it exposes too many details, giving the target page the freedom to read every control property. If you need to change the page later to use different input controls, it s difficult to maintain these properties. Instead, you ll probably be forced to rewrite code in both pages. A better choice is to define specific, limited methods that extract just the information you need. Here s an example: Public Function GetFullName() As String Return txtFirstName.Text & " " & End Function txtLastName.Text

As you learned in the previous chapter, the SOAP specification supports all the data types defined by the XML Schema standard. These are considered simple types. Additionally, SOAP supports complex types, which are structures built out of an arrangement of simple types. You can use complex types for a web method return value or as a parameter. However, if a web method requires complex type parameters, you can interact with it only using SOAP. The simpler HTTP GET and HTTP POST mechanisms won t work, and the browser test page won t allow you to invoke the web method. You ve already used one example of a complex type: the DataSet. When you call the GetEmployees() method in the EmployeesService, .NET returns an XML document that describes the schema of the DataSet and its contents. Here s a partial listening of the SOAP response message: <soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" > <soap:Body> <GetEmployeesResponse xmlns="http://www.apress.com/ProASP.NET/"> <GetEmployeesResult> <xs:schema id="NewDataSet" xmlns="" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata"> <!-- Schema omitted. --> </xs:schema> <diffgr:diffgram xmlns:msdata="urn:schemas-microsoft-com:xml-msdata" xmlns:diffgr="urn:schemas-microsoft-com:xml-diffgram-v1"> <EmployeesDataSet xmlns=""> <Employees diffgr:id="Employees1" msdata:rowOrder="0"> <EmployeeID>1</EmployeeID> <LastName>Davolio</LastName> <FirstName>Nancy</FirstName> <Title>Sales Representative</Title> <TitleOfCourtesy>Ms.</TitleOfCourtesy> <HomePhone>(206) 555-9857</HomePhone> </Employees> <Employees diffgr:id="Employees2" msdata:rowOrder="1"> <EmployeeID>2</EmployeeID> <LastName>Fuller</LastName> <FirstName>Andrew</FirstName> <Title>Vice President, Sales</Title> <TitleOfCourtesy>Dr.</TitleOfCourtesy>

private void LogOutputMessage(SoapMessage message) { message.Stream.Seek(0, SeekOrigin.Begin); LogMessage(message, newStream); message.Stream.Seek(0, SeekOrigin.Begin); CopyStream(newStream, oldStream); } Once they ve moved the stream to the right position, both LogInputMessage() and LogOutputMessage() extract the message data from the SOAP stream and write a log message entry with that information. The function also checks whether the SOAP message contains a fault. In that case, the message is logged in the event log as an error. private void LogMessage(SoapMessage message, Stream stream) { StreamReader reader = new StreamReader(stream); eventMessage = reader.ReadToEnd(); string eventMessage; if (level > 2) eventMessage = message.Stage.ToString() +"\n" + eventMessage; if (eventMessage.IndexOf("<soap:Fault>") > 0) { // The SOAP body contains a fault. if (level > 0) WriteToLog(eventMessage, EventLogEntryType.Error); } else { // The SOAP body contains a message. if (level > 1) WriteToLog(eventMessage, EventLogEntryType.Information); } } This completes the code for the SoapLog extension.

This way, the relationship between the two pages is well documented and easily understood. If the controls in the source page change, you can probably still keep the same interface for the public methods. For example, if you changed the name entry to use different controls in the previous example, you would still be forced to revise the GetFullName() method. However, once your changes are confined to CrossPage1.aspx, you don t need to modify CrossPage2.aspx at all.

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