Application idle event handler used to run undo command results in an eInvalidInput error

[ChristianBlei]

Hello,

I try to "undo" the previous command be running an editor command "undo" in an application idle event. I get an eInvalidInput error.

What is the reason for this error and is there a way to avoid it?

I attached the handler inside of  a database_modified eventhandler where I check if I want to use the "undo".

My code:

private static void AcApplication_Idle(object sender, EventArgs e)
{
AcApplication.DocumentManager.MdiActiveDocument.Editor.Command("_.undo", "1");
}

Thanks for helping!

[ChristianBlei]

I searched again and found a couple of threads pointing in the correct direction. It is not possible to use Editor.Command in an application context. So I tried SendStringToExecute, which is working.