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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> <HomePhone>(206) 555-9482</HomePhone> </Employees> ... </EmployeesDataSet></diffgr:diffgram> </GetEmployeesResult> </GetEmployeesResponse> </soap:Body> </soap:Envelope>

Notice that the WSE namespaces incorporate the number 3, which indicates the third version of the WSE toolkit. This is because the third version is not backward compatible with the first two. To prevent a conflict with partially upgraded applications, the WSE classes are separated into distinct namespaces by version. This is part of the messy reality of working with emerging web service standards.

Note In addition, you could specify a style resource in the Resources property of any element in the control hierarchy, enabling it to be used (only) by the descendents of that element, although this isn t recommended due to potential maintainability issues (specifically because of confusion as to where a style resource definition can be found).

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The constructor for the UsernameToken class accepts three parameters: a string with the user name, a string with the password, and the hashing option you would like to use. Unfortunately, if you want to use the default authentication provider in the WSE (which uses Windows authentication), you must choose PasswordOption.SendPlainText. As a result, this code is extremely insecure and subject to network spying unless you send the request over an SSL connection. Although this example adds only two extra details to the request, the SOAP message actually becomes much more complex because of the way the WS-Security standard is structured. It defines additional details such as an expiration date (used to prevent replay attacks) and a nonce (a random value that can be incorporated in the hash to increase security). Here s a slightly shortened example of the SOAP request message: <soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:wsa="http://schemas.xmlsoap.org/ws/2004/03/addressing" mlns:wsse="http://docs.oasis-open.org/wss/2004/01/..." xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/..."> <soap:Header> <wsa:Action>http://www.apress.com/ProASP.NET/GetEmployees</wsa:Action> <wsa:MessageID>uuid:5b1bc235-7f81-40c4-ac1e-e4ea81ade319</wsa:MessageID> <wsa:ReplyTo> <wsa:Address>http://schemas.xmlsoap.org/ws/2004/03/...</wsa:Address> </wsa:ReplyTo> <wsa:To>http://localhost:8080/WebServices3/EmployeesService.asmx</wsa:To> <wsse:Security soap:mustUnderstand="1"> <wsu:Timestamp wsu:Id="Timestamp-dc0d8d9a-e385-438f-9ff1-2cb0b699c90f"> <wsu:Created>2004-09-21T01:49:33Z</wsu:Created> <wsu:Expires>2004-09-21T01:54:33Z</wsu:Expires> </wsu:Timestamp> <wsse:UsernameToken xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/..." wsu:Id="SecurityToken-8b663245-30ac-4178-b2c8-724f43fc27be"> <wsse:Username>guest</wsse:Username> <wsse:Password Type="http://docs.oasis-open.org/wss/2004/01/...">secret</wsse:Password> <wsse:Nonce>9m8UofSBhw+XWIqfO83NiQ==</wsse:Nonce> <wsu:Created>2004-09-21T01:49:33Z</wsu:Created> </wsse:UsernameToken> </wsse:Security> </soap:Header> <soap:Body> <GetEmployees xmlns="http://www.apress.com/ProASP.NET/" /> </soap:Body> </soap:Envelope>

You can also use your own custom classes with NET web services In this case, when you build the proxy, a copy of the custom class will automatically be added to the client (in the appropriate language of the client) The process of converting objects to XML is known as serialization, and the process of reconstructing the objects from XML is know as deserialization The component that performs the serialization is the SystemXmlSerializationXmlSerializer class You shouldn t confuse this class with the serialization classes you learned about in 13, such as the BinaryFormatter and SoapFormatter These classes perform NET-specific serialization that works with proprietary NET objects, as long as they are marked with the Serializable attribute Unlike the BinaryFormatter and SoapFormatter, the XmlSerializer works with any class, but it s much more limited than the BinaryFormatter and SoapFormatter and can extract only public data.

The WSE-enabled service examines the supplied token and validates it immediately. The default authentication provider that s included with the WSE uses Windows authentication, which means it extracts the user name and password from the SOAP header and uses it to log the user in under a Windows account. If the token doesn t map to a valid Windows account, an error message is returned to the client. However, if no token is supplied, no error occurs. It s up to you to check for this condition on the web server in order to restrict access to specific web methods. Unfortunately, the WSE isn t integrated in such a way that it can use the User object. Instead, you need to retrieve the tokens from the current context. The WSE provides a RequestSoapContext. Using the RequestSoapContext.Current property, you can retrieve an instance of the SoapContext class that represents the last received message. You can then examine the SoapContext.Security.Tokens collection.

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