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CHAPTER 10 TESTING COM AND WEB SERVICES
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This is the information that will be returned to any program calling this Web Service. The XML code uses tags to describe the contents it is serving. The first line of this code is an XML version tag that tells the version of the XML being used (in this case 1.0) and the encoding. (The encoding is important to the code that will eventually consume this service; but for you, at this point, it doesn t really matter.) The second line describes the data type of the return value as string. It also gives the actual value returned by the service, Hello World. Not very useful, is it It is still a working Web Service; in later steps, you ll make it more useful. 4. Close all web browser windows (there might be two) and return to Visual Studio. Replace the code for the Hello World web method in the Code window with the following code: VB .NET <WebMethod(Description:= _ "This service calculates the area of a rectangle")> _ Public Function RectangleArea(ByVal length As Single, ByVal width As Single) As Single Return length * width End Function C# [WebMethod(Description = "This service calculates the area of a rectangle")] public Single RectangleArea(Single length, Single width) { return length * width; } The first two lines of code comprise an attribute that declares the function following it as a WebMethod that will be exposed by the Web Service. We ve added a description that is useful to have attached to the Web Service in order to describe its functionality to those wishing to use it. It is included in the Service Method help page. Additionally, in this code, the Web Service function, RectangleArea, has been changed to take two arguments, one for length and one for width, and return the corresponding area. 5. Right-click Service.asmx in the Solution Explorer window, and select View In Browser, as shown in Figure 10-2, just as you did in step 2. The same window (as shown in Figure 10-3) will display once again, but this time, of course, the name of the web method will be RectangleArea and notice that just below the name, the description will also display. 6. Click the RectangleArea link; a browser window similar to Figure 10-4 displays.
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CHAPTER 10 TESTING COM AND WEB SERVICES
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Figure 10-4. Entering the Web Service parameters This browser window now contains two boxes for you to enter the length and width parameters that the Web Service will use to calculate an area. Before taking the next step, scroll down and read the section titled SOAP 1.1 in this window. This describes the SOAP envelope in which your Web Service will be enclosed. This envelope and the WSDL document provided with the Web Service have been created for you. 7. Enter two values, such as 7 and 2, in the length and width parameters and click the Invoke button. You will see the following XML code appear: < xml version="1.0" encoding="utf-8" > <float xmlns="http://tempuri.org/">14</float> Of course the value 14 in this code represents the result of 2 7, which are the numbers you entered in the example. The <float is the part of the tag that tells what kind of data the result will be. Recall that when we wrote the code, we specified that the return value would be of type double, which means a double-precision floating point number. This XML code specifies that the return value will be a float. This is the floating point data type that is generic to Web Services, and so this makes this Web Service consumable by programs written in other languages, as you will see in the next section. 8. Save your work.
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