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CHAPTER 10 TROUBLESHOOTING .NET REMOTING
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CustomerManager , you used Customermanager . This is a mistake that happens quite often, especially because the .NET Remoting framework doesn t throw an exception during RemotingConfiguration.Configure() when it encounters an incorrectly specified type attribute. This usually leads to a larger debugging session, as your configuration file might contain a large number of configured types.
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Note This is especially true because some remoting objects might even work if they are instantiated in
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your client application and not on the server as desired. They could, however, cease to work as soon as your application is deployed to your user s PC. A very common cause for this is a remoting component accessing a database, which might work directly on your (the developer s) machine because you have correct credentials to access your database server, but might not work on the user s machine because that user isn t known to SQL Server s integrated security system.
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To verify whether or not a certain instance contains a real local object or a proxy pointing to a server, you can call RemotingServices.IsTransparentProxy() as illustrated in the following snippet: String filename = AppDomain.CurrentDomain.SetupInformation.ConfigurationFile; RemotingConfiguration.Configure(filename); CustomerManager mgr = new CustomerManager(); if ( ! RemotingServices.IsTransparentProxy(mgr)) { throw new Exception("CustomerManager has not been correctly configured"); } Checking each object after a call to new is, however, rather cumbersome and error prone, so you may want to use an alternative solution that checks the configured types after your application has read its remoting configuration file. To do this, you can simply iterate over the result of RemotingConfiguration.GetRegisteredWellKnownClientTypes(). For each WellKnownClientTypeEntry, you would then check whether its ObjectType property has been set to an existing type object. If this property is null, this means that the remoting framework could not find the type you have specified in your configuration file. In practice, this helps you to pinpoint potential typos in your client-side configuration file. This solution also works if you have chosen to use a purely interface-based method of remoting! If you like to use this approach in your applications, you can simply follow a pattern similar to the following in your client-side code: static void Main(string[] args) { String filename = AppDomain.CurrentDomain.SetupInformation.ConfigurationFile; RemotingConfiguration.Configure(filename); VerifyRemotingConfiguration();
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CHAPTER 10 TROUBLESHOOTING .NET REMOTING
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CustomerManager mgr = new CustomerManager(); // ... implementation removed ... } static void VerifyRemotingConfiguration() { foreach (WellKnownClientTypeEntry en in RemotingConfiguration.GetRegisteredWellKnownClientTypes()) { if (en.ObjectType == null) { throw new Exception("Could not find type " + en.TypeName + " in assembly " + en.AssemblyName); } } } The call to VerifyRemotingConfiguration() will only succeed if you ve previously called RemotingConfiguration.Configure() and if all type attributes contained in this configuration file could be correctly resolved.
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Checking Types on Your Server
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A solution like the one presented previously, whereby you call a certain method to ensure a correct remoting configuration, unfortunately can t help you with your debugging efforts if you host your components in IIS. In this case, however, the solution is even easier: a special configuration setting, <debug>, can be used in server-side configuration files to verify the existence of all specified server-side type entries. After including this setting in your server-side web.config file as shown in the following example, you will receive an exception as soon as the server tries to read this configuration file: <configuration> <system.runtime.remoting> <application> <channels> <channel ref="http" port="1234" /> </channels> <service> <wellknown mode="Singleton" type="ServerImpl.CustomerManager, ServerImpl" objectUri="CustomerManager.rem" /> </service> </application> <debug loadTypes="true" /> </system.runtime.remoting> </configuration>
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CHAPTER 10 TROUBLESHOOTING .NET REMOTING
When contacting a server for which this setting has been included, but which contains a typo or misconfiguration in web.config, you ll receive the exception shown in Figure 10-2 on the client side. This is usually more desirable than hitting an exception later on when you try to access one of your many configured types.
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