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XML Web services are compiled in the same manner as normal C# source files; however, the target must be a library, not an application executable. To compile the example, save it using the filename Sum.cs. The following command will compile this example into a library that can be deployed to IIS:
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csc /out:SumService.dll /target:library Sum.cs
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For more information about using the C# compiler, see 4, "Language Syntax and Features."
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19. Introduction to XML Web Services
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The assembly that the compiler creates must be placed in a subdirectory named bin contained within the XML Web service deployment directory created earlier with the IIS Wizard for example, C:\SumService\bin.
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Creating the Directive
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To deploy an XML Web service, a directive file must be created, acting as a bridge between ASP.NET and the assembly containing the XML Web service code. The file should have the same name as the XML Web service but with the .asmx extension, which for our example would be SumService.asmx. The complete contents of the file for our example service are shown here:
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<%@ WebService Class="SumService.Sum" %>
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The Class attribute defines the C# class that will be used for the XML Web service. This class must be contained within an assembly in the bin subdirectory of the deployment directory; the common laguage runtime (CLR) will search for an assembly that contains the specified class. It's also possible to specify the assembly that the CLR should use, avoiding the need to perform a potentially time-consuming search; the assembly name is appended after the class name, as shown in the following example:
<%@ WebService Class="SumService.Sum, SumService" %>
The directive file must be placed in the root of the deployment directory. The URL to access an XML Web service includes the name of the directive file, taking the following form:
http://<host name>/<virtual directory>/<directive file>.asmx
For our example, the URL would become:
http://localhost/SumService/SumService.asmx
Configuring XML Web Services
XML Web services can be configured using XML files, in much the same way that application configuration files are used; for more information, see Appendix C, "Configuring Applications." XML Web service configuration is contained in the configuration/system.web/webservices element. The allowed subelements are listed in Table19-4. XML Web services don't require a configuration file to operate; if a file isn't found, default values will be used.
19. Introduction to XML Web Services
Table 19-4. XML Web Service Configuration Subelements
Description See the "Protocols" section of this chapter for more information. <serviceDescriptionFormatExtensionTypes> Advanced SOAP settings. Consult the .NET documentation for more details. <soapExtensionTypes> <soapExtensionReflectorTypes> <soapExtensionImporterTypes> <wsdlHelpGenerator>
Element <protocols>
Specifies a Web Forms page to display when the XML Web service is queried by a Web browser. Consult the .NET documentation for more information.
XML Web service configuration files are stored in the root of the deployment directory and are named Web.config; the .NET runtime automatically loads the configuration file.
Protocols
The only configuration element relevant to this chapter is <protocols>. This setting defines how an XML Web service can be used and accessed. The supported protocols are listed in Table 19-5.
Table 19-5. Supported XML Web Service Protocols
Protocol Description Documentation A special protocol that allows XML Web services to be tested with a browser. See the section "Testing XML Web Services" coming up for more details. HttpSoap SOAP over HTTP protocol. HTTP GET requests, where parameters for XML Web service methods are HttpGet appended to the URL after a question mark ( ). HTTP POST requests, where the parameters for XML Web service methods HttpPost are passed in the free-format section of the request. The following configuration file demonstrates how to enable all four protocols:
<configuration> <system.web> <webServices> <protocols> <add name="Documentation"/> <add name="HttpSoap"/> <add name="HttpGet"/> <add name="HttpPost"/> </protocols> </webServices> </system.web> </configuration>
19. Introduction to XML Web Services
Examples of how queries and responses for each of the protocols should be formatted can be obtained by using a Web browser to examine the XML Web service. See the "Testing XML Web Services" section coming up for more information. The settings in the XML Web service configuration file are overridden by those in the machine configuration file. For more information, see Appendix C.
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