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PART V
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The use of the Description and MessageName properties in the preceding code illustrates how you can overload methods in an XML web service Save and execute the project by pressing F5 The result should look like what is shown in Figure 28-14 Test the web methods to ensure that they truly work as overloaded functions and that the conversion works
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The Project Files
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The different files that are included in the Solution Explorer are part of the project and perform important tasks during the design-time and runtime phases of the XML web service These files are listed in Table 28-2
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MCAD/MCSD Visual C# NET Certification All-in-One Exam Guide
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Figure 28-14
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The enhanced conversion service
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File
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Webconfig
vsdisco file
AssemblyInfocs /bin folder
This optional file is located in the root directory of the web application and is used to configure handlers for events raised by the ASPNET application or session objects The Globalasmx file cannot be returned to a client browser because the NET Framework is configured to reject any request for the file Should a new version of the Globalasmx file be saved into the root directory of the application, the Globalasmx is recompiled when all current connections are closed This is the configuration file for the XML web service By using this file, you can configure all aspects of the service, including security For more information about the Webconfig file, see 30 This is the dynamic discovery document that is used to publish the XML web service To use dynamic discovery, publish the vsdisco file rather than the XML web service This file contains project information and will be compiled into the XML web service assembly This folder off the root of the application is where the compile output of the application will be stored The /bin folder is also important in that any assembly added to it will be available to the application without any registration
Table 28-2
Files Used by an XML Web Service
28: XML Web Services
EXAM TIP The /bin directory is very important Any assemblies copied into the /bin directory are available to the application without any registration
XML Web Service Consumers
We will now look at how you can create an application that will consume an XML web service There are a number of different steps, and we will look at them in turn First, we will revisit the Web Services Description Language (WSDL) and the structure of a WSDL document Then we will look at the XML web service discovery process We will also look at the XML web service proxy and how it is generated using wsdlexe, and we will then implement the consumer using Visual Studio NET and C# NET
WSDL
The Web Services Description Language (WSDL) is an XML grammar that describes an XML web service by defining the messages it accepts and sends The WSDL document forms a contract between the service provider and the service consumer The WSDL document is a list of definitions indeed the root element of the WSDL document is named <definitions> Table 28-3 describes the elements that must be present in the <definitions> element: The best way to see WSDL in action is to look at an XML web service and then describe it using WSDL The following code has been tagged with attributes and defines a storage-only class (Weather) that has been marked with the [XmlRoot] attribute to be called forecast Each of the data members is marked with the [XmlElement] attribute, identifying them as public entities
[XmlRoot("forecast")] public class Weather { [XmlAttribute("city"] public string City; [XmlElement("state"] public string State; [XmlElement("country"] public string Country; [XmlElement("windspeed"] public decimal WindSpeed; [XmlElement("winddirection"] public string WindDirection; [XmlElement("temperature"] public decimal Temperature; [XmlElement("airpressure"] public decimal AirPressure; [XmlElement("sky"] public string Sky; }
PART V
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public class WeatherForecast { [WebMethod] public Weather GetForecast(string city) { Weather w = new Weather(); wCity = "Mimico"; wState = "Ontario"; wCountry = "Canada"; wWindSpeed = 50; wWindDirection = "NNW"; wTemperature = 330; wAirPressure = 9604; wSky = "Partly cloudy"; return w; } }
Given the C# source code with XML web service attributes we can now start building the WSDL document The first step is to define the data-types that are used in the messages the XML web service supports This is done by describing them using the Extensible Schema Definition language (XSD) The namespaces used in this example are s (which is xmlns:s=http://wwww3org/2001/XMLSchema), and s0, which refers to the namespace of the [WebService] The data-type definition for the Weather class would be as follows:
<s:complexType name="Weather"> <s:sequence> <s:element minOccurs="1" maxOccurs="1" <s:element minOccurs="1" maxOccurs="1" <s:element minOccurs="1" maxOccurs="1" <s:element minOccurs="1" maxOccurs="1" <s:element minOccurs="1" maxOccurs="1" <s:element minOccurs="1" maxOccurs="1" <s:element minOccurs="1" maxOccurs="1" </s:sequence> <s:attribute name="city" type="s:string" </s:complexType>
name="state" type="s:string" /> name="country" type="s:string" /> name="windspeed" type="s:decimal" /> name="winddirection" type="s:string" /> name="temperature" type="s:decimal" /> name="airpressure" type="s:decimal" /> name="sky" type="s:string" /> />
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