A Web Services Example

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Any application can have a web service component. Web services can be created regardless of programming language. The following example use ASP.NET to create a simple web service that converts the temperature from Fahrenheit to Celsius, and vice versa:

http://www.w3schools.com/xml/tempconvert.asmx

view source print? 01 <%@ WebService Language="VBScript" Class="TempConvert" %> 02   03 Imports System 04 Imports System.Web.Services 05   06 Public Class TempConvert :Inherits WebService 07   <WebMethod( )> Public Function FahrenheitToCelsius( 08       ByVal Fahrenheit As String ) As String 09     dim fahr 10     fahr = trim( replace( Fahrenheit, "," , "." ) ) 11     if fahr = "" or IsNumeric(fahr) = false then return "Error" 12     return ( ( ( ( fahr ) - 32 ) / 9 ) * 5 ) 13   end Function 14   15   <WebMethod( )> Public Function CelsiusToFahrenheit( 16       ByVal Celsius As String ) As String 17     dim cel 18     cel = trim( replace( Celsius, ",", "." ) ) 19     if cel = "" or IsNumeric(cel) = false then return "Error" 20     return ( ( ( ( cel ) * 9 ) / 5 ) + 32 ) 21   end Function 22 end Class

Few comments about this web service:

• The ASP.NET file extension .asmx is for XML web services.


• To run this example, you will need a .NET server.


• The first line in the example states that this is a web service, written in VBScript, and has the class name TempConvert.


• The next steps are basic VB programming. This application has two functions: (i) one to convert from Fahrenheit to Celsius, and (ii) one to convert from Celsius to Fahrenheit.


• Use WebMethod( ) to convert the functions into web services.