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102 Creating a WCF Service
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Figure 101: The WCF Test Client Running the Default WCF Service Library
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changes are validated by the build tools, which are focused on language and type consistency rather than runtime issues It is quite possible to create a WCF service that builds correctly, but because of configuration problems is not able to load When a load problem does occur, the WCF Service Host utility lets you know about error conditions and other detectable problems But what about services and interfaces that you expect to see that do not appear By using this tool to test every single change that is made, you assure yourself that you are never more than one or two Undos away from working code
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1022 Making a Windows Mobile Compatible WCF Service When Visual Studio provides its auto-generated WCF service library, it creates code for the full desktop framework To be compatible with the NET Compact Framework we must remove any incompatibilities; and it just so happens that one and only one incompatibility exists The autogenerated service uses a binding, wsHttpBinding, that is not supported by the NET Compact Framework By changing the binding to basicHttpBinding in the file Appconfig (see Listing 103), we enable the WCF service to be accessed from a Windows Mobile client The Appconfig file is an application configuration file, with which you may already be familiar It is an XML file, full of the angle brackets and wellformed markup that XML fans have grown to know and love Within the outermost <configuration> block, the auto-generated sample provides a <systemserviceModel> block for WCF service configuration details
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Figure 102: WCF Service Configuration Editor
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There are at least two ways to modify the Appconfig file Since the file contains XML, it can be edited with any text editor In addition, Visual Studio provides a special editor: the WCF Service Configuration Editor, which you can run from the Visual Studio Tools menu Figure 102 shows the WCF Service Configuration Editor changing the service binding The Appconfig file is optional because WCF services are entirely configurable in code If you choose to take this route, you create a problem for yourself because even the smallest change requires source code changes and the resulting need to rebuild and redeploy your binaries The architects of WCF designed the system to support both code configurations and config file configurations Config files allow WCF services to be fieldtweaked to meet site-specific requirements In most cases, config file changes take precedence over code configuration changes; the one exception, for security settings, allows developers to hard-code the minimum security settings for a WCF service
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1023 Setting the Host Address Another change is needed to the auto-generated WCF service This time, network addressability is the issue and not fixing an incompatibility The auto-generated Appconfig file has a host address with http://localhost
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102 Creating a WCF Service
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The network stack resolves this address to an IP address of 127001, which is the Internet host loopback address The loopback address makesalot of sensefor an auto-generatedservice sample It is particularly convenient when a developer plans to run both client and service on the same host machine, because no service configuration change is needed Eventually, of course, the host address must be updated because the main point of WCF is to enable network communication between client and server systems The loopback address makes less sense for a Windows Mobile developer because client and host can never run on the same system Even when testing your code on an emulator, the emulator is physically running on your host but from a network point of view is logically separate A network-enabled emulator has a network address that is different from the host system on which it is running To allow another network machine to access the WCF service, the configuration file needs an address other than the loopback address The solution is plain: Each device needs a unique network address For LANs, which are the typical development environment, we use a hard-coded IP address (1000100) plus subnet mask (2552552550) Internet-deployed services need an address that can be resolved correctly by the DNS servers (Listing 103 shows the auto-generated Appconfig file; the two items needing to be changed are highlighted in bold text) See the sidebar Setting Up No-Network Hosts for tips on enabling networks when no LAN or WAN is available (eg, on a plane or when giving a demo at a trade show or locked-down security sites such as the Microsoft main campus)
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