C> NETCFSvcUtilexe SmartMeterdll in .NET framework

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C> NETCFSvcUtilexe SmartMeterdll
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This operation outputs a set of files One file has an extension of wsdl, and the other files have an extension of xsd You use wildcards to specify both sets of files in a single call to this utility:
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C> NETCFSvcUtilexe *wsdl *xsd
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Whichever approach you take, the result is two or more C# source files With the first approach, the following three files are generated:
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CFClientBasecs Providercs Usagecs
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Whereas the second approach produces the following two source files
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CFClientBasecs schemasmicrosoftcom200310SerializationArrayscs
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Move these files into the directory that contains your Windows Mobile source code Add all of the generated source files to your Visual Studio project (with the Project | Add Exiting Item menu item) Of these two approaches, we prefer the first That is, we prefer calling into the running service One reason we prefer the first approach is that the resulting source files have friendlier names The second reason is that when you call into the running service, the resulting code has a constructor that makes it simpler to create a WCF client
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103 Creating a WCF Client in Windows Mobile
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1033 Instantiating a WCF Client As we discussed earlier in this chapter, you need three things to access a WCF endpoint: an address, a binding, and a contract If you want, you can create each of these items yourself in your WCF client In other words, you can take control of individual elements and modify them as needed For example, a WCF client might know several different addresses for a service and may decide which one to use based on time of day or geographical location (one for Asia, another for Europe, and a third for the United States) Or there might be different security configurations different certificates, for example that you need to dynamically alter In addition to enabling greater flexibility in configuration, there is one situation when you are required to use the more verbose approach That occurs for client proxy code that is generated from a local service DLL (the second method described in the preceding section) Here is code that creates each required element of a WCF endpoint address, binding, and contract in connecting to the WCF service:
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var address = new EndpointAddress( "http://100010:8731/SmartMeter/Provider"); var binding = new BasicHttpBinding(); var Provider = new ProviderClient(binding, address); var addrUsage = new EndpointAddress( "http://100010:8731/SmartMeter/Usage"); var bindUsage = new BasicHttpBinding(); var clientUsage = new UsageClient(bindUsage, addrUsage);
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The auto-generated proxy code supports your doing that It also supports your creating a connection with a single line of code That code involves creating an instance of a class that starts with the service name and ends with the word Client The Provider proxy provides a class named ProviderClient; the Usage proxy provides a class named UsageClient In these two lines of code, we create an instance of each:
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var pc = new ProviderClient(); var uc = new UsageClient();
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When you develop desktop WCF clients, the proxy classes contain a
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Close method This is not the case on the proxies that are created for Windows Mobile clients (You get a reminder about the need to call the Close
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method when you enter the service URI into a browser) Since your proxies
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have no Close method, you do not (and cannot) call this method with a Windows Mobile WCF client
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1034 Accessing the WCF Service After you instantiate a WCF client connection, you access the WCF service through methods in the client instance The IntelliSense support that is built into Visual Studio 2008 makes it very simple When you type the name of a client instance (pc or uc in the last example) you are shown a list of available methods To make a call to get the name of the electric company that is represented by a provider code of SCL001, we make a call such as the following:
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string strMyProvider = pcGetProviderName("SCL001");
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To query the electricity usage on June 2, 2010 for customer number 1234-56-78, we make a call such as this:
DailyUsage du = ucGetDailyUsage("12-34-56-78", new DateTime(2010, 06, 2));
The real beauty of WCF can be seen in the client code The real work that we delegate to the WCF service is made available to our client through a combination of the physical network and the WCF plumbing code The result is that to the WCF client, the service looks and feels like a local procedure call To the developer, it is an easy thing Even though calls to a WCF service may be as easy as calling local methods, the calls are in fact more expensive Sending a function call across a network takes time, and that can make your application appear sluggish Better to have fewer calls that each returns an array of data than to have many calls that each returns a single value You can get a sense for this when you load and run our WCF client sample, ReadSmartMeter
1035 WCF Client Sample: ReadSmartMeter Our sample WCF client, ReadSmartMeter, calls into both the IProvider interface and the IUsage interfaces that are provided by our WCF service Figure 103 shows our client running and displaying the electricity costs for one day in the life of an electricity user The total amount of WCF plumbing code in our client is very short: one line of code for instantiating the client interface object At least, that is what it looks like on the surface When you explore the three source files that we had to add to our client, however, it is a different story