Revit macro for setting door handedness

Been getting more in the api and have this solution for adding a “LH” or “RH” to a parameter in the doors. It adds it to a parameter called “Handedness” though this could be anything. I put this together from multiple sources, and it uses the FacingFliped & HandFliped parameter to assign the handedness. This works very well as it is hooked to the flip controls so no chasing down information. Next it starts a transaction to update the parameter in the door. A try catch block deals with the ones that do not have the parameter for handedness. Next will be to add the parameter to the door in the catch block…

public void GetDoorsSetHandednessParam()
{   
Document doc = this.ActiveUIDocument.Document;

int updatedDoors = 0;
int doorWithNoParam = 0;
string handedness = "";
               
ElementClassFilter familyInstanceFilter = new ElementClassFilter(typeof(FamilyInstance));
ElementCategoryFilter doorsCategoryfilter = new ElementCategoryFilter(BuiltInCategory.OST_Doors);
LogicalAndFilter doorInstancesFilter = new LogicalAndFilter(familyInstanceFilter, doorsCategoryfilter);
FilteredElementCollector collector = new FilteredElementCollector(doc);
ICollection<Element> doors = collector.WherePasses(doorInstancesFilter).ToElements();
            
     //Run through each door as family instance and determine handedness and store in param// 
     foreach (FamilyInstance e in doors)
       { 
       if (e.FacingFlipped ^ e.HandFlipped)
         {
         handedness= "LH";
         }
       else
         {
         handedness = "RH";
         }
      //start transaction to update the handedness param in each door//
      using (Transaction t = new Transaction(doc))
      {
       t.Start("Add handedness to door...");
        {
        //this will catch exception if doors do not have handedness param//
        try
        {
        e.get_Parameter("Handedness").Set(handedness);
        } 
        catch (Exception) 
        {
        doorWithNoParam +=1;
        continue;
        }
        t.Commit();
        updatedDoors += 1;
            }
            }
    }
         //give results//
         TaskDialog resultsDialog = new TaskDialog("Add Handedness to Non-SF Doors Results");
               resultsDialog.MainContent = "THE FOLLOWING HAPPENED:" + "\n" + "\n"
            + updatedDoors + "  DOORS WERE UPDATED" + "\n"
            + doorWithNoParam + "  DOORS WITHOUT HANDEDNESS PARAMETER WERE NOT " + "\n";
            resultsDialog.ExpandedContent = "PLEASE ADD THE HANDEDNESS SHARED PARAMETER TO THE DOORS AND RE-RUN THE MACRO" + "\n";
            resultsDialog.Show();  
}