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If you re following along, it s possible that you ll see an AddressAlrea dyInUseException with an error message complaining that Another application has already registered this URL with HTTP.SYS. This usually means you have a copy of ChatHost still running somewhere on your desktop you ll find a console window running the service host. Or possibly, the WCF Service Host is still running. This error occurs when you launch a second copy of the service because it tries to listen on the same address as the first, and only one program can receive requests on a particular URL at any one time.

Following the naming convention for client events established by the Microsoft Ajax Library, you can add an event handler for the propertyChanged event by passing the handler to the add_propertyChanged method. In the event handler, you test against the string returned by the get_propertyName method to determine which property has changed its value. With the property-change notification mechanism, we ve completed our discussion of the features that can be leveraged by nonvisual client components. Some topics remain, because you have a whole UI to take care of. The rest of the chapter is dedicated to the additional features provided by visual components. By understanding the nuts and bolts of behaviors and controls, you ll have a complete understanding of the client component model.

Visual Studio displays the message in its Output window because of the call to Debug.WriteLine in PostNote, just like it did when using the WCF Test Client earlier, verifying that the proxy was able to invoke an operation on the service. (You might

need to look carefully to see this the message can get buried among the various other notifications that appear in the Output window.) Notice that in Example 13-5 we didn t need to tell the proxy what address to use. That s because the Add Service Reference dialog imported more than just the contract definition. It adds information to the ChatClient project s App.config file, shown in all its gory detail in Example 13-6.

< xml version="1.0" encoding="utf-8" > <configuration> <system.serviceModel> <bindings> <wsHttpBinding> <binding name="WSHttpBinding_IChatService" closeTimeout="00:01:00" openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:01:00" bypassProxyOnLocal="false" transactionFlow="false" hostNameComparisonMode="StrongWildcard" maxBufferPoolSize="524288" maxReceivedMessageSize="65536" messageEncoding="Text" textEncoding="utf-8" useDefaultWebProxy="true" allowCookies="false"> <readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="16384" maxBytesPerRead="4096" maxNameTableCharCount="16384" /> <reliableSession ordered="true" inactivityTimeout="00:10:00" enabled="false" /> <security mode="Message"> <transport clientCredentialType="Windows" proxyCredentialType="None" realm="" /> <message clientCredentialType="Windows" negotiateServiceCredential="true" algorithmSuite="Default" /> </security> </binding> </wsHttpBinding> </bindings> <client> <endpoint address="http://localhost:8732/Design_Time_Addresses/ ChatServerLibrary/ChatService/" binding="wsHttpBinding" bindingConfiguration="WSHttpBinding_IChatService" contract="ChatService.IChatService" name="WSHttpBinding_IChatService"> <identity> <userPrincipalName value="ian@idg.interact" /> </identity> </endpoint> </client> </system.serviceModel> </configuration>

If a program s flow of control enters a try statement that has a finally block, the finally block is always executed. The flow of control is illustrated in Figure 11-5. If no exception occurs inside the try block, then at the end of the try block, control goes to the finally block skipping over any catch clauses. If an exception occurs inside the try block, then any appropriate catch clauses in the catch clauses section are executed, followed by the finally block.

Like the service configuration we examined earlier, this also has an <endpoint> element with an address, binding, and contract, although being on the client side, this <endpoint> appears inside a <client> element instead of a <service> element. The proxy gets the address from this endpoint definition.

You can provide the proxy with an address from code if you want to. It offers various constructor overloads, some of which accept a URL. But if you don t provide one, it will look in the configuration file.

Notice that the endpoint also has a bindingConfiguration attribute this refers to a <binding> element earlier in the file that contains information on exactly how the wsHttpBinding should be configured. There was nothing like this in the service, because we were just using the defaults. But the Add Service Reference dialog always generates a binding configuration entry, even if you happen to be using the defaults. Our chat application is demonstrating the ability for the client to send a note to the server, but it s not complete yet. The client needs a couple of extra features. To make our conversation a bit less one-sided, we should be able to see notes written by other people. And unless our conversations are all going to be exceptionally brief, we need to be able to type in more than just one note. We ll fix that second problem by modifying the code in Example 13-5. We ll put the call to the proxy inside a loop, and we ll also ask for the user s name, so we can support notes from people who may not be called Ian (see Example 13-7).

static void Main(string[] args) { ChatServiceClient chatProxy = new ChatServiceClient(); Console.WriteLine("Please enter your name:"); string name = Console.ReadLine(); while (true) { Console.WriteLine("Type a note (or hit enter to quit):"); string note = Console.ReadLine(); if (string.IsNullOrEmpty(note)) { break; } chatProxy.PostNote(name, note); }

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