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The envelope is the root element of the message XML. It contains the message body and message header elements. The body element is required for all SOAP messages. It contains qualified XML for the request and response messages. The header contains optional extended information for the SOAP message. The WS-Specification settings are stored in the header. Retrieves the SOAP fault from the envelope, if there is one, and returns an Exception class. The Context property enables you to modify the SOAP message contents within a custom WSE filter; or to process the SOAP message contents within a SoapReceiver processing class.

The subsequent graphical operations are then performed on this pane object. To draw a line curve, you should use the PointPairList collection that the ZedGraph library provides. This allows you to create a single collection of data items that correspond to the X and Y values of a chart. The PointPairList supports many data types, including dates, so it s perfect for the example s needs. After the input parameters (ticker and days) have been read in and sanitized, the DataTier service is called to return a DataTable containing the results of the query for that stock and the number of days of price history you want for it. You then iterate through the DataTable and pull this information out like this:

complex message pathways because of its infrastructure-level support for addressing and routing specifications Finally, the diagram makes no mention of a specific transport channel This implicitly emphasizes WCF s most important advantage of not having to factor in the transport and messaging infrastructure into the application design In contrast, today s ASPNET Web services that leverage WSE 30 still require the developer to write manual code that is specific to alternate transport channels, such as TCP In WCF, the service is the basic component of an application, and it supports a special kind of object called a typed channel that is equivalent to today s proxy objects for Web service clients The typed channel provides an interface for sending and receiving messages between service components WCF provides a utility called WSDLgenexe, which is similar to today s wsdl.

public SoapEnvelope CreateSoapMessage() { SoapEnvelope message = new SoapEnvelope(); RequestQuote q = new RequestQuote(); RequestQuote.Symbol = "MSFT"; message.SetBodyObject(q); // Assign the addressing SOAP message headers message.Context.Addressing.Action = new Action( "http://www.bluestonepartners.com/schemas/StockTrader/RequestQuote"); message.Context.Addressing.From = new From(fromUri); message.Context.Addressing.ReplyTo = new ReplyTo(fromUri); return message; }

for (int i = 1; i < nRows; i++) { ny = Convert.ToDouble(dtTable.Rows[i].ItemArray[1]); XDate tmpDate = new XDate( Convert.ToDateTime(dtTable.Rows[i].ItemArray[0])); nx = (double)tmpDate; pt.Add(nx, ny); }

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exe utility, and allows you to generate proxy class files for clients to use for accessing your service Typed channels are independent of the actual objects that process the service request WCF employs Service Manager objects that are responsible for mapping typed channels to their associated business objects, including the DialogManager and ListenerManager objects The WCF service layer automatically handles the receiving, processing, and sending of messages, including all of the serialization work that is required to build and process a message This is very similar to the way that the ASP NET infrastructure processes messages that are received and sent via an asmx Web page WCF provides the Service object for its services, which is conceptually equivalent to the ASP NET WebService object The Service object provides you with programmatic access to the underlying messaging and transport infrastructure.

AJAXBook.SUV.prototype = { get_DriveType: function() { return this._DriveType; }, dispose: function() { alert("Disposing instance of class SUV"); } } AJAXBook.SUV.registerClass("AJAXBook.SUV", AJAXBook.Car);

Listing 9-4 illustrates several important points: SOAP messages cannot be empty, because their purpose is to communicate requests or responses. Here, the SOAP message is designed to transmit a stock quote request. It uses the RequestQuote class to generate a correctly formatted request. Recall that RequestQuote is defined in an interface definition file that provides class representations for all of the StockTrader custom data types. The SoapEnvelope s SetBodyObject method automatically generates the SOAP message body for the RequestQuote object. The SOAP message headers store addressing information directly, using the WSE 2.0 addressing classes. The Action property is required, and must reflect the operation that the sender is calling. If it calls a Web service that supports multiple operations, then the Action property enables the service to differentiate incoming requests, and to process them correctly.

NOTE Refer back to 3 for a detailed discussion on the StockTrader XML schema. This chapter shows you how to build the StockTrader XML schema from scratch, and also shows you how to generate an interface definition file of classes based on the schema.

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