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After the <services> element you ll see a <behaviors> element in your App.config, containing a <serviceBehaviors> element which contains a <behavior> element. This section allows various WCF features to be switched on or off. You might wonder why these settings don t just go into the <services> section. The reason is that you might want to host multiple services, all of which share common behavior configuration. You can define a single named <behavior> element, and then point multiple <service> elements behaviorConfiguration attributes at that behavior, reducing clutter in your configuration file. Or, as in this case, you can create an unnamed <behavior> element, which defines default behavior that applies to all services in this host process. Since we re hosting only one service here, this doesn t offer much advantage, but this separation can be useful when hosting multiple services. The <behavior> element that Visual Studio provides has some comments telling you what you might want to change and why, but paring it down to the essential content leaves just this:

<behaviors> <serviceBehaviors> <behavior> <serviceMetadata httpGetEnabled="True" /> <serviceDebug includeExceptionDetailInFaults="False" /> </behavior> </serviceBehaviors> </behaviors>

ClamXav is built on open source technology. At the core, it is a command-line utility, with a GUI built on top of it, allowing administrators to control it easily. You can also configure ClamAV, the back-end package of ClamXav, from the command line.

There s a whole set of companies that also tried to give something away and sell something else..

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This configures a couple of optional features. The first is related to the metadata exchange mentioned earlier it just ensures that the service description can be fetched in a certain way. Again, we ll come back to metadata when we get to the client, so you can ignore that for now. The second behavior here the serviceDebug element doesn t have any effect, because it sets the includeExceptionDetailInFaults property to its default value, False. Nothing would change if you removed this. The only reason Visual Studio puts this here at all is to help you out when debugging sometimes it s useful to set this to True temporarily, and putting this entry in the file saves you from having to look up the name of the setting. Making this True will mean that if your service throws an exception, the full exception details including stack trace will be sent back to the client in the response. Generally speaking, you should never do this, because sending stack traces to your clients reveals implementation details about your system. If some of your clients are

evil hackers, this might make it easier for them to break into your system. (Technically, if your system is completely secure, a stack trace won t help them, but when did you last hear about a computer system that was completely secure It s safe to presume that everything has security flaws, so the less help you give hackers the better this is often described as reducing the attack surface area of your system.) While you don t normally want to send stack traces over the network, doing so can sometimes make it easier to diagnose problems during development. So you might switch this setting on temporarily to make your life easier. But remember to turn it off before you ship! That s everything Visual Studio put into our configuration file. This shows just a tiny fraction of all the settings we could put in there, but this isn t a book about WCF, so that ll do for now. After all that, our program still isn t ready to host the service. As well as putting configuration entries into the application configuration file, our program needs to make an API call to tell WCF that it wants to host services. (If we were writing a web application, we wouldn t need to do this having the configuration in the web.config file would be enough. But for other application types, we need to do this one last step.) So we need to add a reference to the System.ServiceModel component that s the main .NET Framework class library DLL for WCF and we also need to add using System.ServiceModel; and using ChatServerLibrary; directives to the top of the Program.cs file in our ChatHost project. We can then write our Main method to look like Example 13-4.

Livingston: You were the first company to do that Kahle: Well, I think we may have been the first to think of the Internet as a dis-

static void Main(string[] args) { using (ServiceHost host = new ServiceHost(typeof(ChatService))) { host.Open(); Console.WriteLine("Service ready"); Console.ReadKey();

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