I have been using a Find & Replace feature for Sheet Names and Sheet Numbers without incident for a while, but I have now included an Append option as well, however this function doesn't always give a "Undo/Redo" option if it is the first function performed on the model. I am in Revit 2019.2.1.
Here is what I use for code in the Find and Replace:
class FindReplaceSheetName : IExternalCommand
{
public Result Execute(ExternalCommandData commandData, ref string message, ElementSet elements)
{
UIApplication uiapp = commandData.Application;
Document doc = uiapp.ActiveUIDocument.Document;
App.ControlID.doc = doc;
int count = 0;
Forms.FindReplaceForm fpf = new Forms.FindReplaceForm();
if (fpf.ShowDialog() == DialogResult.OK)
{
using (Transaction t = new Transaction(doc))
{
try
{
t.Start("Find & Replace Sheet Name");
foreach (Element sheet in Helpers.Collectors.ByCategory(doc, BuiltInCategory.OST_Sheets))
{
if (sheet.Name.Contains(App.ControlID.find))
{
sheet.Name = sheet.Name.Replace(App.ControlID.find, App.ControlID.replace);
count++;
}
}
t.Commit();
MessageBox.Show("Modified " + count + " Sheet Names","Information",MessageBoxButtons.OK,MessageBoxIcon.Information);
return Result.Succeeded;
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString(), "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
return Result.Failed;
}
}
}
else
{
return Result.Failed;
}
}
}
Here is what I am using for the Append Code:
class SheetNameAppend : IExternalCommand
{
public Result Execute(ExternalCommandData commandData, ref string message, ElementSet elements)
{
UIApplication uiapp = commandData.Application;
Document doc = uiapp.ActiveUIDocument.Document;
int count = 0;
Forms.SheetNameAppendForm fpf = new Forms.SheetNameAppendForm();
if (fpf.ShowDialog() == DialogResult.OK)
{
using (Transaction t = new Transaction(doc))
{
try
{
t.Start("Append Sheet Name");
foreach (Element sheet in Helpers.Collectors.ByCategory(doc, BuiltInCategory.OST_Sheets))
{
if (App.ControlID.prefix == true)
{
sheet.Name = App.ControlID.append + sheet.Name;
}
else
{
sheet.Name = sheet.Name + App.ControlID.append;
}
count++;
}
t.Commit();
MessageBox.Show("Modified " + count + " Sheet Names", "Information", MessageBoxButtons.OK, MessageBoxIcon.Information);
return Result.Succeeded;
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString(), "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
return Result.Failed;
}
}
}
else
{
return Result.Failed;
}
}
}
Sean Page, AIA, NCARB, LEED AP
Partner, Computational Designer, Architect
Partner, Computational Designer, Architect
Developer Advocacy and Support + 
