Figure 632: The Primes Web Services Page in the Browser in Visual Studio .NET

Encoder Code 128C in Visual Studio .NET Figure 632: The Primes Web Services Page in the Browser
Figure 632: The Primes Web Services Page in the Browser
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For instance, accessing the following URL causes the help page to be delivered as the response: wwwOurServercom/WSService/Primesasmx The same URL with the attached query string shown here, www OurServercom/WSService/Primesasmx op=GetFloorPrime, indicates that the GetFloorPrime Web method of the service is to be invoked
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The Web Services Description Language (WSDL) is an XML-based language that Web Services use to define the requests they will accept and the responses they will return From the perspective of a NET Compact Framework programmer, the most important information in the WSDL is the signatures of the classes Thus, the WSDL received from a Web service will tell the client the names of the classes and the names and data types of the public properties, methods, parameters, return values, and so on In other words, the WSDL relays all the information necessary for a client program to create an instance of a class at the Web service and to invoke the class s methods and properties
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Because the browser now has all the necessary information to generate and send the SOAP messages that represent the method calls, we can test the page s class methods, as shown in Figure 633 The test page also shows the SOAP message that will be sent and received by a method call, in this case GetFloorPrime, as shown in Figure 634 We test the Primes service by asking for the largest prime less than 16 Figure 635 shows us the SOAP message returned by the service Buried within it is 13, the return value from the GetFloorPrime method call Next we add another Web services page, named DataSupplier, to our project and code our second service This one also has just one class and one method The method does very little processing and returns a data set that was built when the application first started This is a common practice for Web services because they often need to bring data into memory, hold it in memory for a period of time, and make it available to clients during that time The code for this service is shown in Listing 624
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Figure 633: Testing the Web Services Page s Primes Class in the Browser
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Figure 634: The Structure of a SOAP Message Request
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Figure 635: The SOAP Message Returned by the GetFloorPrime Method Call Listing 624: The DataSupplier Web Services Class
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using using using using using using using System; SystemCollections; SystemComponentModel; SystemData; SystemDiagnostics; SystemWeb; SystemWebServices;
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namespace WSService { /// <summary> /// Summary description for DataSupplier /// </summary> public class DataSupplier : SystemWebServicesWebService { public DataSupplier() { //CODEGEN: This call is required // by the ASPNET Web Services InitializeComponent(); } #region Component Designer generated code [WebMethod] public DataSet GetNorthwindData() { return GlobaldsetDB; } } }
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The code that creates the data set is in the global area of the Web service, Globalasax It uses the ADONET classes we already covered, including
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ADONET Programming SystemData and SystemDataSqlClient, to create the data set and load the Categories and Products tables from the Northwind database into the
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data set Much of the code was generated by dragging the two tables from the Server Explorer window onto the Globalasax Designer Listing 625 shows the code for the asax page
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Listing 625: The Globalasax Web Services Page
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using using using using using using using System; SystemData; SystemDataSqlClient; SystemCollections; SystemComponentModel; SystemWeb; SystemWebSessionState;
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namespace WSService { /// <summary> /// Summary description for Global /// </summary> public class Global : SystemWebHttpApplication { /// <summary> /// Required designer variable /// </summary> private SystemComponentModelIContainer components = null; public Global() { InitializeComponent(); } internal SystemDataSqlClientSqlDataAdapter daptCategories; internal SystemDataSqlClientSqlCommand SqlSelectCommand1; internal SystemDataSqlClientSqlConnection connNorthwind; internal SystemDataSqlClientSqlCommand SqlSelectCommand2; internal SystemDataSqlClientSqlDataAdapter daptProducts; public static DataSet dsetDB; protected void Application_Start(Object sender, EventArgs e) {
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dsetDB = new DataSet(); LoadDataSet(dsetDB); } protected void Session_Start(Object sender, EventArgs e) { } protected void Application_BeginRequest(Object sender, EventArgs e) { } protected void Application_EndRequest(Object sender, EventArgs e) { } protected void Application_AuthenticateRequest( Object sender, EventArgs e) { } protected void Application_Error(Object sender, EventArgs e) { } protected void Session_End(Object sender, EventArgs e) { } protected void Application_End(Object sender, EventArgs e) { } private void LoadDataSet( DataSet dsetDB) { daptCategoriesFill(dsetDB, "Categories"); daptProductsFill(dsetDB, "Products"); dsetDBRelationsAdd( "FKProdCAt", dsetDBTables["Categories"]Columns["CategoryID"],