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COM+ 1.5 and higher allows you to provide separate configuration files (essentially like app.config or web.config) for each COM+ Application. This is an important feature available on Windows XP and Windows Server 2003 (and higher), because without it you could only provide one configuration file for all COM+-hosted .NET code. To use this feature, you need to create two files for your Enterprise Services assembly: application.config application.manifest The application.config file is actually named application.config. It is a standard .NET config file that contains the normal .NET configuration that you would put into any app.config file, including the CSLA .NET configuration settings. For instance, it might look like this: < xml version="1.0" encoding="utf-8" > <configuration> <appSettings> <add key="CslaAuthentication" value="Csla"/> </appSettings> </configuration> Most likely, you ll need to add a <connectionStrings> element with the connection strings for your database. You can see an example in the code download for this book.
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The application.manifest file is required by Enterprise Services and looks like this: < xml version="1.0" encoding="UTF-8" standalone="yes" > <assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0"> </assembly> These two files are part of the EnterpriseServicesHostcs project in the ProjectTracker solution. However, when you deploy the assembly to the application server, these files need to go in a directory so they can be referenced from COM+.
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Installing the Proxy/Host into COM+
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At this point, you ve seen how to create the proxy/host assembly, including all the references and extra steps required to make it work with COM+. The final step is to register the assembly with COM+ on your application server, and then to configure the COM+ Application. Registering a .NET assembly into COM+ is done using the regsvcs.exe command line utility. In a Visual Studio 2005 command prompt window, navigate to the directory containing EnterpriseServicesHostcs.dll and type the following command: > regsvcs EnterpriseServicesHostcs.dll This will install the assembly into COM+. It will put the assembly into a COM+ Application with the name based on the ApplicationName attribute in EnterpriseServicesSettings.cs: Project Tracker20cs Portal. Figure 12-6 shows the result in the Component Services management console.
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Figure 12-6. Proxy/host component installed in COM+
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There are two key bits of configuration you should do before using the component. First, you should set the COM+ Application to run under a user account appropriate for your environment. This is done in the properties window for the application, as shown in Figure 12-7.
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Figure 12-7. Setting the identity account for the service
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As shown in Figure 12-7, you should change the identity for the application to a specific user account. That user account should have appropriate access to the database or other data sources (such as XML files) on your application server. Second, you need to configure the application root directory property on the Activation tab in the Properties window, as shown in Figure 12-8.
Figure 12-8. Setting the application root directory for the component
CHAPTER 12 s IMPLEMENTING REMOTE DATA PORTAL HOSTS
The application root directory must point to the location on the server where you put the application.config and application.manifest files discussed earlier. Obviously, the user account you set up on the Identity tab must have access to this directory. At this point, your application server is ready for use. The assembly is registered with COM+, and the COM+ Application is set up appropriately for your environment. The next task is to make an msi install program that can be run on each client so they have access to the server component.
Creating the Setup Program
To create a setup program (msi) for your proxy/host assembly, you need to right-click the COM+ Application node in the component services console; in this case, the ProjectTracker20cs Portal node. Choose Export from the pop-up menu. This brings up the Application Export Wizard. The important step in the wizard is shown in Figure 12-9.
Figure 12-9. Exploring the COM+ Application to create a client install
Make sure to choose the application proxy option, as shown in Figure 12-9, and provide a path and name for the msi file to be created. The result will be both msi and cab files that you can use to set up clients to use the server.
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