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Build a Loosely Coupled Web Service Client
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Add a new console application named StockTraderConsole to the Visual Studio .NET solution, and then do one of the following: Generate the proxy class manually with the wsdl.exe command-line utility applied to the Web service WSDL document, or Use the Add Reference wizard in Visual Studio .NET to automatically generate the proxy class in the client project. Once you have generated the proxy class, you simply reference it directly from the client code, as shown in Listing 4-6. Listing 4-6. Web Service Consumer Code
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// Create an instance of the Web service proxy StockTraderProxy serviceProxy = new StockTraderProxy(); // Retrieve the Web Service URI from app.config serviceProxy.Url = ConfigurationSettings.AppSettings["remoteHost"];
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// Call the Web service to request a quote Quote q = serviceProxy.RequestQuote("MSFT"); // Display the Quote results in the form Console.WriteLn("\t:Company:\t " + q.Company); Console.WriteLn("\t:Symbol:\t " + q.Symbol); Console.WriteLn("\t:Last:\t " + q.Last.ToString()); Console.WriteLn("\t:Prev Close:\t " + q.Previous_Close.ToString());
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For more information on building loosely coupled clients, please refer to 3.
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Build a Tightly Coupled Web Service Client
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Auto-generated proxy class files are completely self-contained and essentially provide the client with a separate local copy of the interface and type definitions that the Web service supports. If the Web service interface changes, then the client will not automatically pick up on these changes unless they clear the existing Web reference and regenerate the proxy class. You can manage this risk by modifying the auto-generated proxy class to conform to the standard interface and type definitions that are contained in the StockTraderTypes assembly. Add a new console application project named StockTraderConsole to the Visual Studio .NET solution file and copy over the proxy class file from the previous chapter s StockTrader Web service. Alternatively, you can auto-generate the proxy class from within the StockTraderConsole project as follows: Step 1: Use the Add Web Reference Wizard to auto-generate the proxy class for the StockTraderContracts Web service at http://localhost/ StockTraderContracts/StockTrader.asmx. Step 2: The auto-generated proxy class file is called Reference.cs and is stored in the solution under the Web References\[Reference Name]\ Reference.map subproject folder. (If you do not see this file, you can use the Project Show All Files menu option to expand all files.) Step 3: Open the Reference.cs file and copy the entire code listing over to a new C# class file called StockConsoleProxy.cs. Rename the proxy class file to StockConsoleProxy, and then do the following: Step 1: Add a reference from the StockTraderConsole project to the StockTraderTypes assembly.
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Step 2: In the StockConsoleProxy class, import the StockTraderTypes namespace, and add the IStockTrader interface to the StockConsoleProxy interface list immediately following SoapHttpClientProtocol. Step 3: Comment out all of the type definitions in the StockConsoleProxy class. These include Quote, Trade, Trades, TradeType, and TradeStatus. They are now redundant because the definition assembly contains the same type definitions. The pseudo-code for the proxy class now reads as shown in Listing 4-7 (modifications from the previous, or auto-generated, proxy classes are shown in bold).
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Listing 4-7. The Proxy Class for the StockTraderContracts Web Service, Modified to Reference the Type Definition Assembly StockTraderTypes
using System.Web.Services; using System.Web.Services.Protocols; using StockTraderTypes; [System.Web.Services.WebServiceBindingAttribute(Name="StockTraderServiceSoap", Namespace="http://www.bluestonepartners.com/schemas/StockTrader")] public class StockConsoleProxy : SoapHttpClientProtocol, StockTraderTypes.IStockTrader { // Pseudo-code only: implementations and attributes are not shown public Quote RequestQuote() {} public System.IAsyncResult BeginRequestQuote() {} public System.IAsyncResult EndRequestQuote() {} // Additional operations are not shown // These include PlaceTrade(), RequestTradeDetails(), // and RequestAllTradesSummary() // Type definitions are commented out of the proxy class // because they are redundant to the type definition assembly // These include Quote, Trade, Trades, TradeType and TradeStatus }
These are trivial modifications because the proxy class already implements all of the IStockTrader interface members. The benefit of explicitly adding the
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IStockTrader interface is to ensure that the proxy class remains constrained in the way it implements the StockTrader operations. You could modify the proxy class in many other ways, but as long as the StockTrader operations remain untouched (interface-wise at least), the client application will compile successfully. Once the proxy class has been modified, the client code can now be implemented in the console application. The StockTraderTypes namespace must be imported into the client class file so that the client can make sense of the type definitions. No additional steps are required to use the definitions assembly. Listing 4-8 shows the client code listing for calling the RequestQuote operation. Listing 4-8. Client Code Listing for Calling the RequestQuote Operation
using StockTraderTypes; namespace StockTraderConsole2 { class StockTraderConsole2 { [STAThread] static void Main(string[] args) { StockTraderConsole2 client = new StockTraderConsole2(); client.Run(); } public void Run() { // Create an instance of the Web service proxy StockConsoleProxy serviceProxy = new StockConsoleProxy(); // Configure the proxy serviceProxy.Url = ConfigurationSettings.AppSettings["remoteHost"]; // Submit the request to the service Console.WriteLine("Calling {0}", serviceProxy.Url); string Symbol = "MSFT"; Quote q = serviceProxy.RequestQuote(Symbol); // Display the response Console.WriteLine("Web Service Response:"); Console.WriteLine(""); Console.WriteLine( "\tSymbol:\t\t" + q.Symbol ); Console.WriteLine( "\tCompany:\t" + q.Company );
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