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Notice that this code does not use the indexer to look up a cache entry. Instead, it uses a method called TryGetValue. You use this when you re not sure if the dictionary will contain the entry you re looking for in this case, the entry won t be present the first time we look it up. (The dictionary would throw an exception if we use the indexer to look up a value that s not present.) TryGetValue returns true if an entry for the given key was found, and false if not. Notice that its second argument uses the out qualifier and it uses this to return the item when it s found, or a null reference when it s not found.

You might be wondering why TryGetValue doesn t just use a null return value to indicate that a record wasn t found, rather than this slightly clumsy arrangement with a bool return value and an out argument. But that wouldn t work with value types, which cannot be null. Dictionaries can hold either reference types or value types.

We need to create a client program to talk to our service. Again, to keep things simple we ll make it a console application. We ll add this to the same solution, calling the project ChatClient. (Obviously, you ll need to stop the ChatHost program first if you re trying this out and it s still running in the debugger.) When you right-click on a project s References item in Visual Studio s Solution Explorer, you re offered an Add Service Reference menu item as well as the normal Add Reference entry. We re going to use that to connect our client to our server via WCF. The Add Service Reference dialog offers a Discover button (shown in Figure 13-6) which attempts to locate services in your current solution. Disappointingly, if we were to click it with our code as it is now, it would report that it didn t find any services. That s because we wrote all the hosting code by hand for ChatHost Visual Studio doesn t realize that our console application is hosting services. It usually looks only in web projects if we d hosted the service in an ASP.NET web application, it would have found it. But with the approach we re taking here, it needs a little help.

For Visual Studio to be able to connect to our console-hosted service we need the service to be up and running before the Add Service Reference dialog is open. The easiest way to do this is to run the project, without debugging it. Instead of pressing F5, we choose Debug Start Without Debugging, or we press Ctrl-F5. This runs the ChatHost program without debugging, leaving Visual Studio free for other tasks, such as adding a service reference. We ll need the address of the service handy, and since it s quite long, it s easiest to open our host s App.config and copy the service address to the clipboard. (It s the baseAddress attribute in the <host> section.) Then we can go to the ChatClient project and add a Service Reference. If we paste the address of the service into the Address box and then click the Go button, after a few seconds we ll see the Services panel on the left display a ChatService entry. Expanding this shows an IChatService item representing the contract, and selecting this shows the one operation available in our contract, PostNote, as Figure 13-6 shows. While the list of services, contracts, and operations in the Add Service Reference dialog is useful for verifying that we have the service we wanted, the significance of the information here goes a little deeper it s part of an important feature of how systems communicate in WCF. Remember that we defined a contract earlier, to describe the operations our service provides to its clients. For the client to communicate successfully with the server, it also needs a copy of that contract. So the best way to think of the Add Service Reference dialog is that it s a tool for getting hold of the contract from a service.

The catch clause handles exceptions. There are three forms of the catch clause, allowing different levels of processing. The forms are shown in Figure 11-3.

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