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If you don t want to host the objects in IIS, classic Windows services are the way to go. Visual Studio .NET, and the .NET Framework in general, make it easy for you to develop a Windows service application. They take care of most issues, starting from the installation of the service to encapsulating the communication between the service control manager and your service application. Integrating remoting in Windows services can also be viewed from another standpoint: when your primary concern is to write a Windows service for example, to provide access to privileged resources you can easily implement the communication with your clients using .NET Remoting. This is somewhat different from conventional approaches in the days before .NET, which forced you to define distinct communication channels using named pipes, sockets, or the COM ROT. Cross-process remoting on a local machine using a TCP channel ought to be fast enough for most applications.
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In the .NET Framework, a Windows service simply is a class that extends System.ServiceProcess. ServiceBase. You basically only have to override OnStart() to do something useful.
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A baseline Windows service is shown in Listing 4-9. Listing 4-9. A Baseline Windows Service using System; using System.Diagnostics; using System.ServiceProcess; namespace WindowsService { public class DummyService : System.ServiceProcess.ServiceBase { public static String SVC_NAME = "Some dummy service"; public DummyService () { this.ServiceName = SVC_NAME; } static void Main() { // start the service ServiceBase.Run(new DummyService()); } protected override void OnStart(string[] args) { // do something meaningful } protected override void OnStop() { // stop doing anything meaningful ;) } } } A service like this will not be automatically installed in the service manager, so you have to provide a special Installer class that will be run during the execution of installutil.exe (from the .NET command prompt). Listing 4-10 shows a basic service installer that registers the service to be run using the System account and started automatically during boot-up. Listing 4-10. A Basic Windows Service Installer using System; using System.Collections; using System.Configuration.Install;
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using System.ServiceProcess; using System.ComponentModel; using WindowsService; [RunInstallerAttribute(true)] public class MyProjectInstaller: Installer { private ServiceInstaller serviceInstaller; private ServiceProcessInstaller processInstaller; public MyProjectInstaller() { processInstaller = new ServiceProcessInstaller(); serviceInstaller = new ServiceInstaller(); processInstaller.Account = ServiceAccount.LocalSystem; serviceInstaller.StartType = ServiceStartMode.Automatic; serviceInstaller.ServiceName = DummyService.SVC_NAME; Installers.Add(serviceInstaller); Installers.Add(processInstaller); } } The installer has to be in your main assembly and has to have [RunInstallerAttribute(true)] set. After compiling the preceding C# files, you will have created a baseline Windows service that can be installed with installutil.exe. When porting the remoting server to become a Windows service, you might want to extend the base service to also allow it to write to the Windows event log. Therefore, you have to add a static variable of type EventLog to hold an instance acquired during void Main(). As an alternative, you could also set the AutoLog property of the service and use the static method EventLog.WriteEntry(). You will also have to extend onStart() to configure remoting to allow the handling of requests as specified in the configuration file. The complete source code for the Windows service based remoting server is shown in Listing 4-11. Listing 4-11. A Simple Windows Service to Host Your Remote Components using using using using System; System.Diagnostics; System.ServiceProcess; System.Runtime.Remoting;
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namespace WindowsService { public class RemotingService : System.ServiceProcess.ServiceBase { private static EventLog evt = new EventLog("Application"); public static String SVC_NAME = ".NET Remoting Sample Service";
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public RemotingService() { this.ServiceName = SVC_NAME; } static void Main() { evt.Source = SVC_NAME; evt.WriteEntry("Remoting Service intializing"); ServiceBase.Run(new RemotingService()); } protected override void OnStart(string[] args) { evt.WriteEntry("Remoting Service started"); String filename = AppDomain.CurrentDomain.SetupInformation.ConfigurationFile; RemotingConfiguration.Configure(filename); } protected override void OnStop() { evt.WriteEntry("Remoting Service stopped"); } } } In two separate classes, you ll then provide the implementation of the MarshalByRefObject CustomerManager and an installer, following the preceding sample. When this program is run in the IDE, you ll see the biggest disadvantage to developing Windows services, the message box that will pop up, telling you that you won t get automatic debugging support from Visual Studio .NET IDE (see Figure 4-12).
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