When overridden in a derived class, restores the pre-installation state of the computer.
(in System.Configuration.Install.dll)
Visual Basic (Declaration)
Public Overridable Sub Rollback ( _
savedState As IDictionary _
)
Dim instance As Installer
Dim savedState As IDictionary
instance.Rollback(savedState)
public virtual void Rollback(
IDictionary savedState
)
public:
virtual void Rollback(
IDictionary^ savedState
)
public function Rollback(
savedState : IDictionary
)
| Exception | Condition |
|---|
| ArgumentException | The savedState parameter is nullNothingnullptra null reference (Nothing in Visual Basic). -or- The saved-state IDictionary might have been corrupted. |
| InstallException | An exception occurred during the Rollback phase of the installation. This exception is ignored and the rollback continues. However, the computer might not be fully reverted to its initial state after the rollback completes. |
When you override the Rollback method in a derived class, be sure to call the base class's Rollback method first in your derived method. A rollback operation restores the computer to the state it was in before the installations occurred. The Rollback method is called if the Install method of this instance of Installer, or any installer in the installer collection, fail to run correctly. Any exceptions generated by calling the Rollback methods of the installers in the installer collection are ignored and the rollback of the other installers continues.
The following example demonstrates the Rollback method of Installer. The Rollback method is overridden in the derived class of Installer. An exception is generated to force an installation rollback.
' Override 'Rollback' method of Installer class.
Public Overrides Sub Rollback(mySavedState As IDictionary)
MyBase.Rollback(mySavedState)
Console.WriteLine("The Rollback method of 'MyInstallerSample'" + _
" has been called")
End Sub 'Rollback
// Override 'Rollback' method of Installer class.
public override void Rollback( IDictionary mySavedState )
{
base.Rollback( mySavedState );
Console.WriteLine( "The Rollback method of 'MyInstallerSample'" +
" has been called" );
}
// Override 'Rollback' method of Installer class.
public:
virtual void Rollback( IDictionary^ mySavedState ) override
{
Installer::Rollback( mySavedState );
Console::WriteLine( "The Rollback method of 'MyInstallerSample'" +
" has been called" );
}
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.
.NET Framework
Supported in: 3.5, 3.0, 2.0, 1.1, 1.0
Reference