asp.net MVC: how to get the previous action name

I　can get the current action name by using the following code

var cu开发者_StackOverflow中文版rrentActionName = ControllerContext.RouteData.GetRequiredString("action");

but is it possible to get the previous action name as well?

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Why not saving it in a session variable?

Try this:

Session["lastAction"] = Session["actualAction"];
Session["actualAction"] = ControllerContext.RouteData.GetRequiredString("action");