Building a Web Service
To illustrate the techniques used to implement a web service in C# using the services classes of the .NET Framework, let’s build a simple calculator and then make use of its functions over the Web.
You begin by specifying the web service. You do so by defining a
class that inherits from
System.Web.Services.WebService. The easiest way to
create this class is to open Visual Studio and create a new C# Web
Service project. The default name that Visual Studio provides is
WebService1, but you might want to choose
something more appropriate.
Visual Studio .NET creates a skeleton web service and even provides a Web Service example method for you to replace with your own code, as shown in Example 16-1.
Example 16-1. Skeleton web class generated by Visual Studio .NET
using System; using System.Collections; using System.ComponentModel; using System.Data; using System.Diagnostics; using System.Web; using System.Web.Services; namespace WSCalc { /// <summary> /// Summary description for Service1. /// </summary> public class Service1 : System.Web.Services.WebService { public Service1( ) { //CODEGEN: This call is required by the ASP.NET Web Services Designer InitializeComponent( ); } #region Component Designer generated code /// <summary> /// Required method for Designer support - do not modify /// the contents of this method with the code editor. /// </summary> private void InitializeComponent( ) { } #endregion /// <summary> /// Clean up any resources being used. /// </summary> ...Get Programming C# now with the O’Reilly learning platform.
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