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There are times when you need a network but lack a network For example, in an airplane (as a passenger, presumably) you want to debug a WCF service Another scenario is for a demo to an audience, maybe your boss to justify your job; maybe to a user groupa As you start, you discover you have no network what to do Here is one approach
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Continues
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a Maybe even WE-DIG, the Windows Embedded Developers Interest Group (wwwwe-digorg)
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Add the Microsoft Loopback Adapter on your desktop system to simulate a network adapter From the Control Panel, run the Add Hardware Wizard Do not let the wizard perform any auto-detections since there is nothing to detect Instead, manually select the hardware For the manufacturer, choose Microsoft and select Microsoft Loopback Adapter Next, set the loopback adapter s IP address We use an IP address of 100010 with a subnet mask of 2552552550 in this chapter s sample WCF service With the host side ready, you next prepare your device We often use the emulator when teaching a class or giving a demo The best way to connect with the emulator is through a high-speed memory channel known as DMA (short for direct-memory access) If you do not already have it installed, you may need to download and install Microsoft Virtual PC 2007 Among its other features, this product installs the network support that is needed to connect to the emulator We establish a connection to the emulator by using ActiveSync on Windows XP (Windows Mobile Device Center WMDC on Windows Vista and later) In the Connection Settings dialog, set the value for Allow connections to one of the following to DMA Note that only one device can be connected to ActiveSync, so if you have another device whether emulator or physical device you must detach that device before connecting to the emulator To establish a connection to the emulator, you use the Device Emulator Manager You can start this tool from the Tools menu in Visual Studio 2008 From within the Device Emulator Manager, select your target emulator (eg, Windows Mobile 6 Professional Emulator) and then select Cradle You should see the status within ActiveSync/WMDC change to show that the emulator is connected
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Listing 103: Appconfig Holding WCF Configuration Details
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< xml version="10" encoding="utf-8" > <configuration> <systemweb> <compilation debug="true" /> </systemweb> <!-- When deploying the service library project, the content of the config file must be added to the host's appconfig file SystemConfiguration does not support config files for libraries --> <systemserviceModel> <services>
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102 Creating a WCF Service
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<service name="SmartMeterService1" behaviorConfiguration="SmartMeterService1Behavior"> <host> <baseAddresses> <add baseAddress = "http://localhost:8731/SmartMeter/Service1/" /> </baseAddresses> </host> <!-- Service Endpoints --> <!-- Unless fully qualified, address is relative to base address supplied above --> <endpoint address ="" binding="wsHttpBinding" contract="SmartMeterIService1"> <!-Upon deployment, the following identity element should be removed or replaced to reflect the identity under which the deployed service runs If removed, WCF will infer an appropriate identity automatically --> <identity> <dns value="localhost"/> </identity> </endpoint> <!-- Metadata Endpoints --> <!-- The Metadata Exchange endpoint is used by the service to describe itself to clients --> <!-- This endpoint does not use a secure binding and should be secured or removed before deployment --> <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange"/> </service> </services> <behaviors> <serviceBehaviors> <behavior name="SmartMeterService1Behavior"> <!-- To avoid disclosing metadata information, set the value below to false and remove the metadata endpoint above before deployment --> <serviceMetadata httpGetEnabled="True"/> <!-- To receive exception details in faults for debugging purposes, set the value below to true Set to false before deployment to avoid disclosing exception information --> <serviceDebug includeExceptionDetailInFaults="False" /> </behavior> </serviceBehaviors>
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</behaviors> </systemserviceModel> </configuration>
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The auto-generated WCF service is a good learning tool It provides a working WCF service library and helps get you started with the various tools that support WCF service development Eventually, you will need to modify the starting point to create a service that actually does what you want it to do We have such a sample in the next section
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1024 SmartMeter: A Sample WCF Service Our sample WCF service is called SmartMeter This service enables customers to download electricity usage data such as might be collected by a smart electrical meter With today s environmental concerns and related worries around peak oil, a smart grid provides a partial solution by adding a digital information system in parallel to the analog electricity distribution system Among its other problems, the old electrical system cannot even detect power outages except when customers report those outages by notifying the electric company One small part of making the electrical system smarter involves collecting electricity usage data for individual customers and then providing that data back to the customers Real-time usage data can help customers become aware of how individual actions affect their electricity consumption Our sample shows how a WCF service could provide historical usage information for individual customers A service such as this could be deployed on a central server, by an individual electric company Alternatively, the service could be operated for several electric companies in the cloud running a server-side system, such as Windows Azure (Microsoft s cloud operating system) However such a service is ultimately deployed, we built our service on the assumption that a single WCF service could provide usage information for customers from several electric companies This assumption gave us the motivation to show how multiple service contracts might be made available from a single WCF service To understand any WCF service code, it helps to start by studying the configuration file; the one for our sample appears in Listing 104
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