Revit.SDK.Samples.DoorSwing.CS.DoorSwingData.DeleteTempDoorInstances C# (CSharp) Method

        public void DeleteTempDoorInstances()
        {
            for (int i = 0; i < m_doorFamilies.Count; i++)
             {
            m_doorFamilies[i].DeleteTempDoorInstance();
             }
        }

        /// <summary>
        /// Implement this method as an external command for Revit.
        /// </summary>
        /// <param name="commandData">An object that is passed to the external application
        /// which contains data related to the command,
        /// such as the application object and active view.</param>
        /// <param name="message">A message that can be set by the external application
        /// which will be displayed if a failure or cancellation is returned by
        /// the external command.</param>
        /// <param name="elements">A set of elements to which the external application
        /// can add elements that are to be highlighted in case of failure or cancellation.</param>
        /// <returns>Return the status of the external command.
        /// A result of Succeeded means that the API external method functioned as expected.
        /// Cancelled can be used to signify that the user cancelled the external operation
        /// at some point. Failure should be returned if the application is unable to proceed with
        /// the operation.</returns>
        public Autodesk.Revit.UI.Result Execute(ExternalCommandData commandData,
                                                ref string message,
                                                ElementSet elements)
        {
            Autodesk.Revit.UI.Result returnCode = Autodesk.Revit.UI.Result.Cancelled;

            Transaction tran = new Transaction(commandData.Application.ActiveUIDocument.Document, "Initialize Command");

            tran.Start();

            try
            {
                // one instance of DoorSwingData class.
                DoorSwingData databuffer = new DoorSwingData(commandData.Application);

                using (InitializeForm initForm = new InitializeForm(databuffer))
                {
                    // Show UI
                    DialogResult dialogResult = initForm.ShowDialog();

                    if (DialogResult.OK == dialogResult)
                    {
                        databuffer.DeleteTempDoorInstances();

                        // update door type's opening feature based on family's actual geometry and
                        // country's standard.
                        databuffer.UpdateDoorFamiliesOpeningFeature();

                        // update each door instance's Opening feature and internal door flag
                        returnCode = DoorSwingData.UpdateDoorsInfo(commandData.Application.ActiveUIDocument.Document, false, true, ref message);
                    }
                }
            }
            catch (Exception ex)
            {
                // if there is anything wrong, give error information and return failed.
                message    = ex.Message;
                returnCode = Autodesk.Revit.UI.Result.Failed;
            }

            if (Autodesk.Revit.UI.Result.Succeeded == returnCode)
            {
                tran.Commit();
            }
            else
            {
                tran.RollBack();
            }
            return(returnCode);
        }