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PublisherChapter 32. The System.Web.Services.Description Namespace
The System.Web.Services.Description
namespace includes types used to represent the elements of
Web Service
Description Language (WSDL), an XML grammar that describes web
services and specifies how to interact with them. Web services
created with ASP.NET automatically generate their own WSDL documents,
which contain all the information a client needs to interact with
them and invoke their methods. You can retrieve this document by
requesting the appropriate .asmx file with
?WSDL appended to the end of the URL (as in
http://www.mysite.com/myservice.asmx?WSDL ).The starting point for understanding this namespace is the
ServiceDescription class, which represents the
complete WSDL document and provides collections of
Binding, Message,
Types, and Service objects. The
ServiceDescription class also provides
Read( ) and Write( ) methods,
which allow you to convert between actual WSDL documents and their
object representation. Finally, you can also use the
ServiceDescriptionReflector class to create a
ServiceDescription object based on an existing web
service by supplying the web service's URL.Another interesting class in this namespace is
ServiceDescriptionImporter, which provides the
functionality .NET uses to create proxy classes based on WSDL
documents. Most other classes represent a particular portion of a
WSDL document, and you do not provide any additional functionality.All details of WSDL implementation are "abstracted
away" from you when creating or consuming a web
service with .NET. For that reason, you may have little need to use
the types in this namespace. To learn more about the specifics of the
WSDL standard on which these types are based, refer to
http://www.w3.org/TR/wsdl. Figure 32-1 shows
ServiceDescriptionFormatExtension-derived types,
and Figure 32-2 shows other types. Figure 32-3 contains the collections in this namespace.
Figure 32-1. ServiceDescriptionFormatExtension-derived types
Figure 32-2. More types from the System.Web.Services.Description namespace
Figure 32-3. Collection classes
