• If you override the Install method in a derived class, be sure to call the base class's Install method first in your derived method. The Install method calls the Install method of each installer contained in the Installers property of this instance. After the contained installers run, this method updates the IDictionary object (specified through the stateSaver parameter) to reflect the status of the installation. The IDictionary should be empty when passed to the Install method. If all the Install methods succeed, the Commit method is called. Otherwise, the Rollback method is called.

• If you need to add installer instances to the Installers collection in the Install method, be sure to perform the same additions to the collection in the Uninstall method. However, you can avoid maintaining the collection in both methods if you add installer instances to the Installers collection in the class constructor for your custom installer.

The following example demonstrates the Uninstall method of Installer. The Uninstall method is overridden in the derived class of Installer.

' Override 'Uninstall' method of Installer class.
Public Overrides Sub Uninstall(mySavedState As IDictionary)
   If mySavedState Is Nothing Then
      Console.WriteLine("Uninstallation Error !")
   Else
      MyBase.Uninstall(mySavedState)
      Console.WriteLine("The Uninstall method of 'MyInstallerSample' has been called")
   End If
End Sub 'Uninstall

// Override 'Uninstall' method of Installer class.
public override void Uninstall( IDictionary mySavedState )
{  
   if (mySavedState == null)
   {
      Console.WriteLine("Uninstallation Error !");
   }
   else
   {
      base.Uninstall( mySavedState );
      Console.WriteLine( "The Uninstall method of 'MyInstallerSample' has been called" );
   }
}

   // Override 'Uninstall' method of Installer class.
public:
   virtual void Uninstall( IDictionary^ mySavedState ) override
   {
      if ( mySavedState == nullptr )
      {
         Console::WriteLine( "Uninstallation Error !" );
      }
      else
      {
         Installer::Uninstall( mySavedState );
         Console::WriteLine( "The Uninstall method of 'MyInstallerSample' has been called" );
      }
   }

• Full trust for the immediate caller. This member cannot be used by partially trusted code. For more information, see Using Libraries from Partially Trusted Code.

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

.NET Framework

Reference