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IVsaEngine.RevokeCache Method

Invalidates the cached assembly for a script engine, as specified by its root moniker.

[Visual Basic]
Sub RevokeCache()
void RevokeCache();
void RevokeCache();
function RevokeCache();


When a script engine is run for the first time, the assembly is added to a global cache of script engines. Thereafter, any script engine having the same root moniker will retrieve the cached assembly rather than re-loading it.

Therefore, use the RevokeCache method to remove an existing version of the assembly in cases where using a more recent version is called for, for example, when the script engine compiles a newer version of an assembly. Under normal circumstances, the script engine doing the compilation will use the newly compiled code; however, in situations where there are multiple script engines, you will need to call the RevokeCache method so engines that are unaware of the newly compiled code do not mistakenly run out-of-date code they have already loaded. In a designer scenario, however, you compile the code on your development machine, and then the host directs the server to unload the out-of-date code so that next time the IVsaEngine.Run method is called the newly compiled code is obtained from the host.

Engine implementers should know that the script engine must not throw an exception if a host calls the RevokeCache method when there is no cached assembly to revoke.

The following table shows the exceptions that the RevokeCache method can throw.

Exception Type Condition
EngineClosed The IVsaEngine.Close method has been called and the engine is closed.
EngineBusy The engine is currently executing code for another thread.
EngineRunning The engine is already running.
EngineNotInitialized The engine has not been initialized.
RevokeFailed The cached copy could not be revoked. Check the Exception.InnerException property for more information.


Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family

See Also

IVsaEngine Interface | IVsaEngine Members | Microsoft.Vsa Namespace

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