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The Web Services Interoperability (WS-I) organization has one primary goal: to establish standard specifications so that Web services can be interoperable across different platforms. In other words, the organization wants Web services to be able to work together, no matter which platform they reside on, or which development tool they were created with. The specifications cover a wide range of areas, from transport protocols to security, and are collectively grouped together as the WS-I Basic Profile.

The Sys.Component class is another pivotal component of the ASP.NET AJAX Client Library. This is also the base class that is ultimately extended by all graphical or nongraphical client controls (Sys.UI.Control actually inherits from Sys.Component). Again, there is a good level of similarity in the model between this class and the System.ComponentModel.Component class of the .NET Framework, a recurring theme with many of the classes in the Sys namespace you have probably noticed by now. Sys.Component uses three key interfaces and four properties. The interfaces include Sys.IDisposable, Sys.INotifyDisposing, and Sys.INotifyPropertyChange. Sys.IDisposable is just like its .NET Framework counterpart. An interface for implementing proper logic for disposing an object and the other two interfaces provide facilities for implementing events used to detect disposing and changes in property of the underlying control. The four properties are events, id, isInitialized, and isUpdating. The events property returns an EventHandlerList object, which contains references to all event handlers that have subscribed to the events of the current component. And while the id property returns the ID field of the current object, isInitialized and isUpdated return boolean types depending on the self descriptive condition. Just like most properties of the classes in the ASP.NET AJAX Client Library, the properties of the Sys.Component class as well can be accessed with built-in get and set accessors as shown in the following script snippet:

1

Next, run the wsdl.exe command-line utility to generate a client proxy file: C:\> wsdl /o:StockTraderProxy.cs StockTrader.wsdl StockTrader.xsd You can then add the proxy class file to the Web service consumer s project, as we will discuss in the next section.

if (myComponent.get_isInitialized()) alert ('My component is initialized');

NOTE The WS-I Basic Profile is the first in what are expected to be several future and evolving profiles. The Basic Profile specifies exact version numbers for its compliant specifications. For example, it includes SOAP 1.1, WSDL 1.1, and XML 1.0. Future profiles will use updated versions, but it takes a long time to establish new specifications, so do not expect new profiles very frequently! View the WS-I Basic Profile Version 1.0 at http://www.ws-i.org/ Profiles/Basic/2003-08/BasicProfile-1.0a.html.

Implement the Web Service Consumer (Step 6)

You can just as easily set a value to a property using the set accessor as done in the following script:

Figure 1-6 illustrates the high-level grouping of interoperable Web services specifications that have been published jointly by Microsoft, IBM, and others. The WS-I Basic Profile covers most of the specifications in the bottom three layers of the diagram, namely the specifications for Transport, Messaging, and Description. The additional layers are covered by the various WS-Specifications, including WS-Security, WS-Reliable Messaging, and WS-Transactions, to name just a few. Some of the WS-Specifications fall within the lower three layers as well, including WS-Addressing for the Messaging layer, and WS-Policy for the Description layer. Note that this figure is adapted directly from a joint MicrosoftIBM white paper titled Secure, Reliable, Transacted Web Services: Architecture and Composition (September, 2003). Please see the References section in the Appendix for more information.

The high-level groupings of Web specifications fall into these categories: Transport: This group defines the communications protocols for moving raw data between Web services. It includes HTTP, HTTPS, and SMTP.

myComponent.set_id('UniqueComponentID');

Listing 3-9 shows a sample of the autogenerated service proxy class. Listing 3-9. The Autogenerated Service Proxy Class [System.Web.Services.WebServiceBindingAttribute(Name="StockTraderServiceSoap", Namespace="http://www.bluestonepartners.com/schemas/StockTrader")] public class StockTraderProxy : System.Web.Services.Protocols.SoapHttpClientProtocol { public StockTraderProxy() {} [System.Web.Services.Protocols.SoapDocumentMethodAttribute( "http://www.bluestonepartners.com/schemas/StockTrader/RequestQuote", Use=System.Web.Services.Description.SoapBindingUse.Literal, ParameterStyle=System.Web.Services.Protocols.SoapParameterStyle.Bare)] [return: System.Xml.Serialization.XmlElementAttribute("Quote", Namespace="http://www.bluestonepartners.com/schemas/StockTrader/")] public Quote RequestQuote([System.Xml.Serialization.XmlElementAttribute( Namespace="http://www.bluestonepartners.com/schemas/StockTrader/")] string Symbol) { object[] results = this.Invoke("RequestQuote", new object[] {Symbol}); return ((Quote)(results[0])); } public System.IAsyncResult BeginRequestQuote(string Symbol, System.AsyncCallback callback, object asyncState) { return this.BeginInvoke("RequestQuote", new object[] { Symbol}, callback, asyncState); } public Quote EndRequestQuote(System.IAsyncResult asyncResult) { object[] results = this.EndInvoke(asyncResult); return ((Quote)(results[0])); } }

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