public Result Execute(ExternalCommandData commandData, ref string message, ElementSet elements) { try { int version = Convert.ToInt32(commandData.Application.Application.VersionNumber); // Construct the form ManageExcelLinksForm form = new ManageExcelLinksForm(commandData.Application.ActiveUIDocument.Document, schemaGUID); // Get the Revit window handle IntPtr handle = IntPtr.Zero; if (version < 2019) { handle = System.Diagnostics.Process.GetCurrentProcess().MainWindowHandle; } else { handle = commandData.Application.GetType().GetProperty("MainWindowHandle") != null ? (IntPtr)commandData.Application.GetType().GetProperty("MainWindowHandle").GetValue(commandData.Application) : IntPtr.Zero; } System.Windows.Interop.WindowInteropHelper wih = new System.Windows.Interop.WindowInteropHelper(form) { Owner = handle }; // Show the form form.ShowDialog(); // Write to home RevitCommon.FileUtils.WriteToHome("Excel Import - Manage Links", commandData.Application.Application.VersionName, commandData.Application.Application.Username); return(Result.Succeeded); } catch (Exception ex) { message = ex.Message; return(Result.Failed); } }