c# create pdf417 Step 4: Implement the Interface in the Web Service Code-Behind File in Visual C#

Printing PDF 417 in Visual C# Step 4: Implement the Interface in the Web Service Code-Behind File

Step 4: Implement the Interface in the Web Service Code-Behind File
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Your hard work in steps 1 through 3 pays off, and you are now ready to implement code for the Web methods. The Web service .asmx code-behind class derives from the System.Web.Services.WebService class by default, as does the IDC file from step 3, so you can derive the .asmx code-behind class directly from the interface definition class instead of directly from System.Web.Services.WebService. You can then implement code for each of the methods.
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Step 5: Generate a Proxy Class File for Clients Based on the WSDL Document
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Web services have no reason to exist unless they are being used by clients. In this step, you generate a proxy class file based on the Web service WSDL document so that clients know how to call your Web service, and know what messages and data types will be exchanged. The wsdl.exe command-line tool will automatically generate this proxy class for you based on the WSDL document. And Visual Studio 2005 will automatically generate the WSDL document for you, so no manual work is required.
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CHAPTER 3 DESIGN PATTERNS FOR BUILDING MESSAGE-ORIENTED WEB SERVICES
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You can actually skip this step if you are developing with Visual Studio 2005, because it will dynamically generate the proxy class file for you when you add a Web reference (for your Web service) to a client project. However, we prefer to manually generate the proxy class file so that we can either alter it or have it ready for clients who are using a development tool without code-generating wizards.
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Step 6: Implement a Web Service Client Using a Proxy Class File
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This final step hooks a client to your Web service. If you are using Visual Studio 2005, simply add a (dynamic) Web reference to the Web service in your client project, and this will automatically generate the proxy class file for you. This wizard will also make the necessary adjustments to your application configuration file to record the location of the Web service. Alternatively, you can manually add the proxy class file from step 5 to your project, update the configuration file, and begin coding. The client essentially does nothing more than delegate method calls to the Web service. Valid clients include Web applications, Windows Forms applications, console applications, or even other Web services.
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This process is obviously more involved than simply creating a new .asmx file and immediately implementing code. But it is the right way to do things because it abstracts out the Web service definitions and the code implementations. Visual Studio and the .NET Framework provide all of the tools that you need to autogenerate the XML-based files and the code, so the amount of manual work is kept to a minimum. The rest of this chapter dissects the various moving parts that make up a messageoriented Web service. You will gain a precise understanding of how multiple files and tools work together to define and implement a message-oriented Web service. We will also provide selective implementation examples that collectively show you how to build this type of Web service from scratch.
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WHAT ARE DESIGN PATTERNS
Design patterns are loosely described as time-tested, established solutions to recurring design problems. Formal design patterns are highly structured and follow strict templates. The design patterns that are presented in this book do not follow this rigorous format, but they are in keeping with the spirit of design patterns because they factor in industry-accepted practices for approaching recurring design problems.
CHAPTER 3 DESIGN PATTERNS FOR BUILDING MESSAGE-ORIENTED WEB SERVICES
Design and Build a Message-Oriented Web Service
This section provides the information that you need in order to build a message-oriented Web service. It is organized along the same six steps presented earlier and provides both conceptual information and implementation information.
The Role of XML Messages and XSD Schemas
The starting point in designing a Web service is to determine what XML messages it will exchange specifically, what messages it will respond to, and what messages it will return. Figure 3-1 shows the standard architecture for a client that interacts with a Web service via a proxy class. This architecture is based on the principle that the client and the Web service both have a common understanding of the messages and data types that are exchanged between them. This understanding can only be achieved if the Web service publishes a clear document of the operations that it supports, the messages it exchanges, and the types that it uses. This document is the WSDL document (described in 2). The WSDL document is the main reference for describing a Web service, and it includes embedded type definitions and message definitions, among other things.
Figure 3-1. Web services architecture showing communication between the client and service Consider the example Web service, StockTrader, from 2 that provides methods for retrieving stock quotes and placing trades. Listing 3-1 presents one of the Web methods called RequestQuote that accepts a stock ticker symbol and returns a detailed stock quote.
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