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CHAPTER 6 CREATING REMOTING CLIENTS
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protected void Application_Start(Object sender, EventArgs e) { // configure the remoting server RemotingConfiguration.Configure(Server.MapPath("web.config")); } The path to the web.config file is retrieved through Server.MapPath(), which returns the physical path to the file on the local system. The call to your server component is again fairly simple. The following code snippet shows the event handler for the command button you have seen previously in Figure 6-4: private void ActionCall_Click(object sender, System.EventArgs e) { IRemoteFactory proxy = (IRemoteFactory)RemotingHelper.CreateProxy( typeof(IRemoteFactory)); Person p = proxy.GetPerson(); ListResults.Items.Add(string.Format("{0} {1}, {2}", p.Firstname, p.Lastname, p.Age)); } That s it, now you have created an ASP .NET-based client for a .NET Remoting server component. Most importantly, remember to configure .NET Remoting within the Application_Start event of the Global.asax code-behind file.
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As you already know from the previous chapters, it is possible to host .NET Remoting components in IIS, too. In this case, the ASP.NET runtime itself hosts the server component, and configuration of the server is done through web.config. Any <service> configuration found in web.config is automatically handled by ASP .NET, which means that you don t need to call RemotingConfiguration.Configure() for your server configuration. If a client configuration is found in web.config, it will be ignored by the ASP .NET runtime therefore clients must be configured manually. Although configuring clients in web.config is basically possible, I will not recommend doing so for reasons discussed in the last chapter. It is better to add another configuration file to your solution (even if you are writing simple ASP .NET Web applications or Web servers that don t host remoting components) and do your client configuration in this file. So you can see how to configure a .NET Remoting component hosted in IIS as a client for another server (the server you created at the very beginning of the chapter), start with creating a Web application project with Visual Studio that you will use for your .NET Remoting server component. Because you don t need it, you can delete the ASPX page that is created automatically after Visual Studio has created the project. The other files, especially web.config and Global.asax, will be necessary for your component. After you have added the references to System.Runtime.Remoting as well as General.dll, you can add a class to your project that will be the server. The server s implementation is shown in Listing 6-5.
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CHAPTER 6 CREATING REMOTING CLIENTS
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Listing 6-5. An Intermediary .NET Remoting Server Hosted in IIS using System; using System.Runtime.Remoting; using General; using General.Client; namespace ClientWebRemoting { public class SecondServer : MarshalByRefObject, IRemoteSecond { private int _counter = 1; private IRemoteFactory _proxy; public SecondServer() { System.Diagnostics.Debug.WriteLine("Initializing server..."); _proxy = (IRemoteFactory)RemotingHelper.CreateProxy( typeof(IRemoteFactory)); System.Diagnostics.Debug.WriteLine("Server initialized!"); } public int GetNewAge() { Person p = _proxy.GetPerson(); int ret = p.Age + (_counter++); System.Diagnostics.Debug.WriteLine( ">> Incoming request returns " + ret.ToString()); return ret; } } } Remember that in the preceding code you don t use any client-side remoting configuration because you are hosting the component in ASP.NET and IIS. Therefore, you have to do the same thing as you did before perform the client configuration within the Global.asax Application_Start event. I ll show the configuration for this component as client of the other server later in this chapter. Now you know why you need to define the interface IRemoteSecond in the shared assembly at the very beginning of this chapter your second server is implementing exactly this interface now.
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CHAPTER 6 CREATING REMOTING CLIENTS
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Note Because you don t have a console window for viewing what happens on the server, use
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Debug.WriteLine() so that you can view activity in the output window from Visual Studio when
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debugging the solution.
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Because the component is hosted in IIS, you can use the HTTP channel only. Therefore, the configuration of the server component in the web.config file looks like the following: <configuration> <system.runtime.remoting> <application> <channels> <channel ref="http" /> </channels> <service> <wellknown type="ClientWebRemoting.SecondServer, ClientWebRemoting" objectUri="SecondServer.soap" mode="Singleton" /> </service> </application> </system.runtime.remoting> <system.web> <compilation defaultLanguage="c#" debug="true" /> <authentication mode="None" /> </system.web> </configuration> The service configuration is done automatically by the ASP .NET runtime. You want to call your other remoting server component from within this server, so you need to add the client configuration. Adding the client configuration to the web.config would be a very bad idea in this case. Remember that RemotingConfiguration.Configure() configures anything in the <system.runtime.remoting> section. If you just add your client s configuration and try to call RemotingConfiguration.Configure(), an exception will occur because the .NET Remoting runtime tries to configure the client and the server. Remember that the server has already been configured by the ASP.NET runtime. Therefore, in this situation you would register the server as well as the server s channel twice, which is not possible within an application domain. A simple, effective, and in my opinion much more readable solution is to add another configuration file (e.g., RemotingClient.config) to the project and add the client configuration to this file. The client configuration is shown in the following code snippet: <configuration> <system.runtime.remoting> <application> <channels> <channel ref="tcp" />
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