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Use the base installer. Commit an installation. Roll back an installation.
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Using Base Installer
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The primary tool that the .NET Framework gives developers to install applications is the Installer class. At a high level, the main reasons for using installers are as follows:
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They give your application a professional look and feel. Although this certainly wasn t always the case, all quality professional applications contain installers. They simplify what a user needs to do to use your product. The harder it is for users to get up and running with your product, the less likely they are to actually use it. They allow you to specify settings that the application needs to run (such as Web service URLs or database locations), and they allow you to set registry keys, make desktop shortcuts, and use many other such features that greatly enhance the user experience. They provide a mechanism for users to remove your application without leaving unwanted remnants (for example, files, images, or registry entries) on their machines.
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The Installer class is the base class you use to create custom installers. There are also two specific predefined installers in the Framework that you can use, AssemblyInstaller and ComponentInstaller. We ll get back to those shortly. To be able to use the Installer class to meet your application s needs, it s necessary to understand how it works.
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Lesson 2: Creating an Installer
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According to the MSDN documentation, the following steps need to be taken to use a class derived from the Installer class: 1. Inherit the Installer class. 2. Override the Install, Commit, Rollback, and Uninstall methods. 3. Add the RunInstallerAttribute to your derived class, and set it to true. 4. Put your derived class in the assembly with your application to install. 5. Invoke the installers. For example, use InstallUtil.exe to invoke the installers.
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MORE INFO Installer class
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More information about the Installer class can be found at http://msdn2.microsoft.com/en-US/library/ system.configuration.install.installer(VS.80).aspx.
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Although most of this is straightforward, the last step needs some explanation. There are many ways to invoke your installers for example, by using the InstallUtil.exe utility. The Installer class has an Installers property, which is actually an instance of the InstallerCollection. This property is useful because it allows you to add multiple installers to one assembly so that different isolated tasks can be run. The next item you need to be aware of is the process of what happens when you start an installation. The first step is that the Install method is called, which commences the installation. If no error conditions are found, the Commit method is called at the end of the installation. The word commit has a special meaning for those familiar with the database and transactional worlds, and its meaning is the same here. Everything succeeds or fails as a group. And because installations are transactional in this sense, you won t have the problem of a partially installed application. This arrangement is a huge benefit. Think of a typical large application Microsoft Office. Imagine that the installation was 99 percent complete and then failed. If it wasn t transactional, you d have many files and registry entries left on your machine that would be of no use. This alone would seriously clutter your machine. So Office is polite enough to restore the machine s state if an installation isn t successful, thereby cleaning up the mess it made. Classes that derive from Installer extend this courtesy as well. However, a trigger needs to be set to indicate that the installation was successful, and therefore, no cleanup is necessary. The mechanism to accomplish this is the Commit method. Similarly, if you decide that you no longer want an application on a machine, there is an Uninstall method. This method allows users to simply remove the application and restore the computer s state, as opposed to manually looking through the application and deleting files and registry entries.
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