InstallException Class
The exception that is thrown when an error occurs during the commit, rollback, or uninstall phase of an installation.
Assembly: System.Configuration.Install (in System.Configuration.Install.dll)
The following example, plus the examples in the InstallException constructors, together make up an example showing an assembly having its own installer. The installer is named MyInstaller, which has an attribute RunInstallerAttribute, indicating that this installer will be invoked by Installer Tool (Installutil.exe). Installer Tool (Installutil.exe) calls the methods Commit, Rollback, Install and Uninstall. The code in Commit presumes that a file named FileDoesNotExist.txt exists before the installation of the assembly can be committed. If the file FileDoesNotExist.txt does not exist, Commit raises an InstallException. The same is the case with Uninstall in which an uninstallation will only happen if a file named FileDoesNotExist.txt exists. Otherwise it raises an InstallException. In Rollback, a code fragment is executed, which might raise an exception. If the exception is raised, it is caught and an InstallException is raised with that exception being passed to it.
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Run this example with the help of Installutil.exe. Type this in the command prompt: |
Installutil InstallException.exe
-or-
Installutil /u InstallException.exe
Imports System Imports System.ComponentModel Imports System.Collections Imports System.Configuration.Install Imports System.IO <RunInstaller(True)> Public Class MyInstaller Inherits Installer Public Overrides Sub Install(savedState As IDictionary) MyBase.Install(savedState) Console.WriteLine("Install ...") ' Commit is called when install goes through successfully. ' Rollback is called if there is any error during Install. ' Uncommenting the code below will lead to 'RollBack' being called, ' currently 'Commit' shall be called. ' throw new IOException(); End Sub Public Overrides Sub Commit(savedState As IDictionary) MyBase.Commit(savedState) Console.WriteLine("Commit ...") ' Throw an error if a particular file doesn't exist. If Not File.Exists("FileDoesNotExist.txt") Then Throw New InstallException() End If ' Perform the final installation if the file exists. End Sub Public Overrides Sub Rollback(savedState As IDictionary) MyBase.Rollback(savedState) Console.WriteLine("RollBack ...") Try ' Performing some activity during rollback that raises an 'IOException'. Throw New IOException() Catch e As Exception Throw New InstallException("IOException raised", e) End Try End Sub 'Rollback ' Perform the remaining rollback activites if no exception raised. Public Overrides Sub Uninstall(savedState As IDictionary) MyBase.Uninstall(savedState) Console.WriteLine("UnInstall ...") ' Throw an error if a particular file doesn't exist. If Not File.Exists("FileDoesNotExist.txt") Then Throw New InstallException("The file 'FileDoesNotExist'" + " does not exist") End If ' Perform the uninstall activites if the file exists. End Sub End Class ' An Assembly that has its own installer. Public Class MyAssembly1 Public Shared Sub Main() Console.WriteLine("This assembly is just an example for the Installer") End Sub End Class
Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
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