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Our example doesn t need this, so it s safe to delete it. The WCF Service Library template adds this in case you are planning to host the project in a web application this enables debugging in web apps. But since we re not writing a web application, it s not needed here. Next is a <system.serviceModel> element in fact, all the remaining contents of the App.config file are inside this element. This is where all WCF configuration lives, regardless of the type of host application. The first element inside the WCF configuration is <services>. This contains a <service> element for each service the program will host. Visual Studio has added two: one for the Service1 service that we re not using, and one for the ChatService we wrote. Since we don t need the Service1 service, we can delete that first <service> element and everything it contains. This leaves the <service> element for our ChatService. It begins:
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<service name="ChatServerLibrary.ChatService">
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The name attribute is the name of the class that implements the service, including the namespace. Inside the <service> element we find some <endpoint> elements. Remember that earlier we said WCF can make a single service implementation accessible through multiple communication mechanisms. You do that by adding one endpoint for each mechanism you wish to support. Here s the first endpoint Visual Studio added for us:
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<endpoint address="" binding="wsHttpBinding" contract="ChatServerLibrary.IChatService"> <identity> <dns value="localhost" /> </identity> </endpoint>
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An endpoint is defined by three things: an address, a binding, and a contract sometimes referred to collectively as the ABC of WCF. The address is typically a URL it s the address a client would use to connect to the service. In this case the address is blank, which means WCF will deduce the address for us we ll see how in a moment. The binding determines the communication technology that WCF will use on this endpoint. Here we ve used one of the built-in bindings called wsHttpBinding. The ws denotes that this uses the various web service standards that begin with WS-. So this binding supports standards such as WS-ADDRESSING and WS-SECURITY. This is a feature-rich binding, and it may use features that some clients don t understand it s not supported by Silverlight, for example. If you wanted to use the basic profile that Silverlight clients support, you d specify basicHttpBinding here instead. But for this application, you can leave the binding as it is. Finally, the contract attribute here contains the name of the interface type that defines the operation contract for our service. We already looked at contracts this refers to the interface we saw in Example 13-1 and modified in Example 13-2. Inside the <endpoint> element you ll see an <identity> element. This is intended for scenarios where the service needs to be able to identify itself securely to a client for example, in a banking application you d want to be confident that you re really talking to your bank. But we re not going to get into security in this example, so we can delete the <identity> element and its contents. Visual Studio added a second endpoint to the App.config when we created the ChatService:
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<endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" />
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This enables something called metadata exchange this endpoint doesn t provide a way to use the service, and instead makes it possible to get a description of the service. We ll be using this later when we build a client for our service. Finally, after the two <endpoint> elements, you ll see a <host> element, as Example 13-3 shows. (This contains a very long line, which has been split across two lines here to make it fit on the page.) This <host> element is still inside the <service> element, so like the two <endpoint> elements, this entry is still describing one particular service our ChatService.
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<host> <baseAddresses> <add baseAddress= "http://localhost:8732/Design_Time_Addresses/ChatServerLibrary/ChatService/" /> </baseAddresses> </host>
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This element contains hosting information that applies to all of this service s endpoints this is how WCF works out what address to use for each endpoint. The baseAddress attribute is combined with the contents of the address attribute for each <endpoint> element to work out the effective address for that endpoint. Since the first endpoint s address is empty, that endpoint s address will be the baseAddress specified here. The second endpoint s address was mex, so that endpoint for the service will be available at:
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