Re: Switching Views and/or Posting Commands...

I had a hunch the RevitCommandEndedMonitor would work with the RequestViewChange() method as well and curiosity got the better of me.  Sure enough, it worked!

    [Transaction(TransactionMode.Manual)]
    [Regeneration(RegenerationOption.Manual)]
    public class TestCommand : IExternalCommand
    {
        private UIApplication _uiApp;

        public Result Execute(ExternalCommandData commandData, ref string message, ElementSet elements)
        {
            _uiApp = commandData.Application;

            TaskDialog.Show("Switch To Sheet Example", "I'm doing things before switching to the sheet.");

            var sheet = Get your ViewSheet <<thisDoc.GetElement(My.Settings.Item("LastActiveView"))>>

            var switchToSheetMonitor = new RevitCommandEndedMonitor(_uiApp);

            switchToSheetMonitor.CommandEnded += ContinueAfterSwitchToSheet;

            _uiApp.ActiveUIDocument.RequestViewChange(sheet);

            return Result.Succeeded;
        }

        private void ContinueAfterSwitchToSheet(object sender, EventArgs e)
        {
            _uiApp.ActiveUIDocument.RefreshActiveView();

            TaskDialog.Show("Switch To Sheet Example", $"I just switched to {_uiApp.ActiveUIDocument.ActiveGraphicalView.ViewName}");
        }
    }

If you use it this way I'd do two things first, rename the RevitCommandEndedMonitor to something like RequestEndedMonitor, and second, test the s**t out of it.

Note: Edited to remove errant command result handling.