C# Transaction.GetFailureHandlingOptions方法代码示例

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

              FilteredElementCollector collector
            = new FilteredElementCollector( doc );

              collector.OfClass( typeof( Level ) );
              Level level = collector.FirstElement() as Level;

              Transaction t = new Transaction( doc );

              t.Start( "Create unbounded room" );

              FailureHandlingOptions failOpt
            = t.GetFailureHandlingOptions();

              failOpt.SetFailuresPreprocessor(
            new RoomWarningSwallower() );

              t.SetFailureHandlingOptions( failOpt );

              doc.Create.NewRoom( level, new UV( 0, 0 ) );

              t.Commit();

              return Result.Succeeded;
        }

        public void CanCreateAndDeleteAReferencePoint()
        {
            using (var trans = new Transaction(RevitData.Document.Document, "CreateAndDeleteAreReferencePoint"))
            {
                trans.Start();

                FailureHandlingOptions fails = trans.GetFailureHandlingOptions();
                fails.SetClearAfterRollback(true);
                trans.SetFailureHandlingOptions(fails);

                ReferencePoint rp = dynRevitSettings.Doc.Document.FamilyCreate.NewReferencePoint(new XYZ());

                //make a filter for reference points.
                ElementClassFilter ef = new ElementClassFilter(typeof(ReferencePoint));
                FilteredElementCollector fec = new FilteredElementCollector(dynRevitSettings.Doc.Document);
                fec.WherePasses(ef);
                Assert.AreEqual(1, fec.ToElements().Count());

                RevitData.Document.Document.Delete(rp);
                trans.Commit();
            }
        }

        /// <summary>
        /// Implementation of the command binding event for the IFC export command.
        /// </summary>
        /// <param name="sender">The event sender (Revit UIApplication).</param>
        /// <param name="args">The arguments (command binding).</param>
        public void OnIFCExport(object sender, CommandEventArgs args)
        {
            try
            {
                // Prepare basic objects
                UIApplication uiApp = sender as UIApplication;
                UIDocument uiDoc = uiApp.ActiveUIDocument;
                Document doc = uiDoc.Document;

                TheDocument = doc;

                IFCExportConfigurationsMap configurationsMap = new IFCExportConfigurationsMap();
                configurationsMap.Add(IFCExportConfiguration.GetInSession());
                configurationsMap.AddBuiltInConfigurations();
                configurationsMap.AddSavedConfigurations();

                String mruSelection = null;
                if (m_mruConfiguration != null && configurationsMap.HasName(m_mruConfiguration))
                    mruSelection =  m_mruConfiguration;

                PotentiallyUpdatedConfigurations = false;

                IFCExport mainWindow = new IFCExport(doc, configurationsMap, mruSelection);
                mainWindow.ShowDialog();

                // If user chose to continue
                if (mainWindow.Result == IFCExportResult.ExportAndSaveSettings)
                {
                    // change options
                    IFCExportConfiguration selectedConfig = mainWindow.GetSelectedConfiguration();

                    // Prepare the export options
                    IFCExportOptions exportOptions = new IFCExportOptions();
                    selectedConfig.UpdateOptions(exportOptions, uiDoc.ActiveView.Id);  

                    // prompt for the file name
                    SaveFileDialog fileDialog = new SaveFileDialog();
                    fileDialog.AddExtension = true;

                    String defaultDirectory = m_mruExportPath != null ? m_mruExportPath : null;
                    
                    if (defaultDirectory == null)
                    {
                        String revitFilePath = doc.PathName;
                        if (!String.IsNullOrEmpty(revitFilePath))
                        {
                            defaultDirectory = Path.GetDirectoryName(revitFilePath);
                        }
                    }

                    if (defaultDirectory == null)
                    {
                        defaultDirectory = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);
                    }

                    String defaultFileName = doc.Title;
                    if (String.IsNullOrEmpty(defaultFileName))
                    {
                        defaultFileName = "Project";
                    }
                    else
                    {
                        defaultFileName = Path.GetFileNameWithoutExtension(defaultFileName);
                    }
                    String defaultExtension = mainWindow.GetFileExtension();

                    fileDialog.FileName = defaultFileName;
                    fileDialog.DefaultExt = defaultExtension;
                    fileDialog.Filter = mainWindow.GetFileFilter();
                    fileDialog.InitialDirectory = defaultDirectory;
                    bool? fileDialogResult = fileDialog.ShowDialog();
                
                    // If user chose to continue
                    if (fileDialogResult.HasValue && fileDialogResult.Value)
                    {
                        // Prompt the user for the file location and path
                        String fullName = fileDialog.FileName;
                        String path = Path.GetDirectoryName(fullName);
                        String fileName = Path.GetFileName(fullName);

                        // IFC export requires an open transaction, although no changes should be made
                        Transaction transaction = new Transaction(doc, "Export IFC");
                        transaction.Start();
                        FailureHandlingOptions failureOptions = transaction.GetFailureHandlingOptions();
                        failureOptions.SetClearAfterRollback(false);
                        transaction.SetFailureHandlingOptions(failureOptions);

                        // There is no UI option for this, but these two options can be useful for debugging/investigating
                        // issues in specific file export.  The first one supports export of only one element
                        //exportOptions.AddOption("SingleElement", "174245");
                        // The second one supports export only of a list of elements
                        //exportOptions.AddOption("ElementsForExport", "174245;205427");

                        // This option should be rarely used, and is only for consistency with old files.  As such, it is set by environment variable only.
                        String use2009GUID = Environment.GetEnvironmentVariable("Assign2009GUIDToBuildingStoriesOnIFCExport");
//.........这里部分代码省略.........

//.........这里部分代码省略.........
                  linkFileName += linksGUIDsCache[currRvtLinkInstance.Id];
               }
               else
               {
                  // check if there are multiple instances with the same name
                  bool bMultiple = (rvtLinkNamesDict[linkFileName] > 1);

                  // add the path
                  linkFileName = fileName + "-" + linkFileName;

                  // add the guid
                  if (bMultiple)
                  {
                     linkFileName += "-";
                     linkFileName += linksGUIDsCache[currRvtLinkInstance.Id];
                  }
               }

               // add the extension
               linkFileName += sExtension;

               linkFileNames.Add(linkFileName);

               // scale the transform origin
               tr.Origin *= lengthScaleFactorLink;

               // serialize transform
               serTransforms.Add(SerializeTransform(tr));
            }

            // IFC export requires an open transaction, although no changes should be made
            Transaction transaction = new Transaction(documentCopy, "Export IFC Link");
            transaction.Start();
            FailureHandlingOptions failureOptions = transaction.GetFailureHandlingOptions();
            failureOptions.SetClearAfterRollback(false);
            transaction.SetFailureHandlingOptions(failureOptions);

            // export
            try
            {
               int numLinkInstancesToExport = linkFileNames.Count;
               exportOptions.AddOption("NumberOfExportedLinkInstances", numLinkInstancesToExport.ToString());

               for (int ii = 0; ii < numLinkInstancesToExport; ii++)
               {
                  string optionName = (ii == 0) ? "ExportLinkInstanceTransform" : "ExportLinkInstanceTransform" + (ii + 1).ToString();
                  exportOptions.AddOption(optionName, serTransforms[ii]);

                  // Don't pass in file name for the first link instance.
                  if (ii == 0)
                     continue;

                  optionName = "ExportLinkInstanceFileName" + (ii + 1).ToString();
                  exportOptions.AddOption(optionName, linkFileNames[ii]);
               }

               // Pass in the first value; the rest will  be in the options.
               String path_ = Path.GetDirectoryName(linkFileNames[0]);
               String fileName_ = Path.GetFileName(linkFileNames[0]);
               bool result = documentCopy.Export(path_, fileName_, exportOptions); // pass in the options here
            }
            catch
            {
            }

            // rollback the transaction

//.........这里部分代码省略.........

               // If user chooses to continue
               if (fileDialogResult.HasValue && fileDialogResult.Value)
               {
                  // change options
                  IFCExportConfiguration selectedConfig = mainWindow.GetSelectedConfiguration();

                  // Prompt the user for the file location and path
                  String fullName = fileDialog.FileName;
                  String path = Path.GetDirectoryName(fullName);
                  String fileName = multipleFiles ? string.Empty : Path.GetFileName(fullName);

                  // This option should be rarely used, and is only for consistency with old files.  As such, it is set by environment variable only.
                  String use2009GUID = Environment.GetEnvironmentVariable("Assign2009GUIDToBuildingStoriesOnIFCExport");
                  bool use2009BuildingStoreyGUIDs = (use2009GUID != null && use2009GUID == "1");

                  string unsuccesfulExports = string.Empty;

                  // In rare occasions, there may be two projects loaded into Revit with the same name.  This isn't supposed to be allowed, but can happen if,
                  // e.g., a user creates a new project, exports it to IFC, and then calls Open IFC.  In this case, if we export both projects, we will overwrite
                  // one of the exports.  Prevent that by keeping track of the exported file names.
                  ISet<string> exportedFileNames = new HashSet<string>();

                  foreach (Document document in mainWindow.DocumentsToExport)
                  {
                     TheDocument = document;

                     // Call this before the Export IFC transaction starts, as it has its own transaction.
                     IFCClassificationMgr.DeleteObsoleteSchemas(document);

                     Transaction transaction = new Transaction(document, "Export IFC");
                     transaction.Start();

                     FailureHandlingOptions failureOptions = transaction.GetFailureHandlingOptions();
                     failureOptions.SetClearAfterRollback(false);
                     transaction.SetFailureHandlingOptions(failureOptions);

                     // Normally the transaction will be rolled back, but there are cases where we do update the document.
                     // There is no UI option for this, but these two options can be useful for debugging/investigating
                     // issues in specific file export.  The first one supports export of only one element
                     //exportOptions.AddOption("SingleElement", "174245");
                     // The second one supports export only of a list of elements
                     //exportOptions.AddOption("ElementsForExport", "174245;205427");

                     if (multipleFiles)
                     {
                        fileName = GenerateFileNameFromDocument(document, exportedFileNames) + "." + defaultExt;
                        fullName = path + "\\" + fileName;
                     }

                     // Prepare the export options
                     IFCExportOptions exportOptions = new IFCExportOptions();
                     
                     ElementId activeViewId = GenerateActiveViewIdFromDocument(document);
                     selectedConfig.UpdateOptions(exportOptions, activeViewId);
                     selectedConfig.ActiveViewId = selectedConfig.UseActiveViewGeometry ? activeViewId.IntegerValue : -1;

                     bool result = document.Export(path, fileName, exportOptions);

                     Dictionary<ElementId, string> linksGUIDsCache = new Dictionary<ElementId, string>();
                     if (result)
                     {
                        // Cache for links guids
                        if (selectedConfig.ExportLinkedFiles == true)
                        {
                           Autodesk.Revit.DB.FilteredElementCollector collector = new FilteredElementCollector(document);

        /// <summary>
        /// Implementation of the command binding event for the IFC export command.
        /// </summary>
        /// <param name="sender">The event sender (Revit UIApplication).</param>
        /// <param name="args">The arguments (command binding).</param>
        public void OnIFCExport(object sender, CommandEventArgs args)
        {
            try
            {
                // Prepare basic objects
                UIApplication uiApp = sender as UIApplication;
                UIDocument uiDoc = uiApp.ActiveUIDocument;
                Document doc = uiDoc.Document;

                TheDocument = doc;

                IFCExportConfigurationsMap configurationsMap = new IFCExportConfigurationsMap();
                configurationsMap.Add(IFCExportConfiguration.GetInSession());
                configurationsMap.AddBuiltInConfigurations();
                configurationsMap.AddSavedConfigurations();

                String mruSelection = null;
                if (m_mruConfiguration != null && configurationsMap.HasName(m_mruConfiguration))
                    mruSelection =  m_mruConfiguration;

                PotentiallyUpdatedConfigurations = false;

                IFCExport mainWindow = new IFCExport(doc, configurationsMap, mruSelection);
                mainWindow.ShowDialog();

                // If user chose to continue
                if (mainWindow.Result == IFCExportResult.ExportAndSaveSettings)
                {
                    // change options
                    IFCExportConfiguration selectedConfig = mainWindow.GetSelectedConfiguration();

                    // Prepare the export options
                    IFCExportOptions exportOptions = new IFCExportOptions();
                    selectedConfig.UpdateOptions(exportOptions, uiDoc.ActiveView.Id);  

                    // prompt for the file name
                    SaveFileDialog fileDialog = new SaveFileDialog();
                    fileDialog.AddExtension = true;

                    String defaultDirectory = m_mruExportPath != null ? m_mruExportPath : null;
                    
                    if (defaultDirectory == null)
                    {
                        String revitFilePath = doc.PathName;
                        if (!String.IsNullOrEmpty(revitFilePath))
                        {
                            defaultDirectory = Path.GetDirectoryName(revitFilePath);
                        }
                    }

                    if (defaultDirectory == null)
                    {
                        defaultDirectory = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);
                    }

                    String defaultFileName = doc.Title;
                    if (String.IsNullOrEmpty(defaultFileName))
                    {
                        defaultFileName = "Project";
                    }
                    else
                    {
                        defaultFileName = Path.GetFileNameWithoutExtension(defaultFileName);
                    }
                    String defaultExtension = mainWindow.GetFileExtension();

                    fileDialog.FileName = defaultFileName;
                    fileDialog.DefaultExt = defaultExtension;
                    fileDialog.Filter = mainWindow.GetFileFilter();
                    fileDialog.InitialDirectory = defaultDirectory;
                    bool? fileDialogResult = fileDialog.ShowDialog();
                
                    // If user chose to continue
                    if (fileDialogResult.HasValue && fileDialogResult.Value)
                    {
                        // Prompt the user for the file location and path
                        String fullName = fileDialog.FileName;
                        String path = Path.GetDirectoryName(fullName);
                        String fileName = Path.GetFileName(fullName);

                        // Call this before the Export IFC transaction starts, as it has its own transaction.
                        IFCClassificationMgr.DeleteObsoleteSchemas(doc);

                        // IFC export requires an open transaction, although no changes should be made
                        Transaction transaction = new Transaction(doc, "Export IFC");
                        transaction.Start();
                        FailureHandlingOptions failureOptions = transaction.GetFailureHandlingOptions();
                        failureOptions.SetClearAfterRollback(false);
                        transaction.SetFailureHandlingOptions(failureOptions);

                        // There is no UI option for this, but these two options can be useful for debugging/investigating
                        // issues in specific file export.  The first one supports export of only one element
                        //exportOptions.AddOption("SingleElement", "174245");
                        // The second one supports export only of a list of elements
                        //exportOptions.AddOption("ElementsForExport", "174245;205427");
//.........这里部分代码省略.........

        /// <summary>
        ///     Starts a RevitAPI Transaction that will be managed by this TransactionManager instance.
        /// </summary>
        /// <param name="document">Document (DB) to start a Transaction for. The parameter can not be null.</param>
        public TransactionHandle StartTransaction(Document document)
        {
            if (Transaction == null || Transaction.GetStatus() != TransactionStatus.Started)
            {
                TransactionManager.Log("Starting Transaction.");
                
                // Dispose the old transaction so that it won't impact the new transaction
                if (null != Transaction && Transaction.IsValidObject)
                    Transaction.Dispose();

                Transaction = new Transaction(document, "Dynamo Script");
                Transaction.Start();

                FailureHandlingOptions failOpt = Transaction.GetFailureHandlingOptions();
                failOpt.SetFailuresPreprocessor(handler);
                Transaction.SetFailureHandlingOptions(failOpt);

                RaiseTransactionStarted();
            }
            return Handle;
        }

            /// <summary>
            /// Execute method invoked by Revit via the 
            /// external event as a reaction to a call 
            /// to its Raise method.
            /// </summary>
            public void Execute(Autodesk.Revit.UI.UIApplication a)
            {
                // As far as I can tell, the external event
                  // should work fine even when switching between
                  // different documents. That, however, remains
                  // to be tested in more depth (or at all).

                  //Document doc = a.ActiveUIDocument.Document;
                  //Debug.Assert( doc.Title.Equals( _doc.Title ),
                  //  "oops ... different documents ... test this" );
                  UIDocument uidoc = a.ActiveUIDocument;

                  while (COVER.Instance.messageQueue.Count > 0)
                  {
                  COVERMessage m = COVER.Instance.messageQueue.Dequeue();
                  if ((MessageTypes)m.messageType == MessageTypes.AvatarPosition || (MessageTypes)m.messageType == MessageTypes.SetView || (MessageTypes)m.messageType == MessageTypes.Resend)//read only messages
                  {
                      COVER.Instance.handleMessage(m.message, m.messageType, a.ActiveUIDocument.Document, uidoc,a);
                  }
                  else
                  {
                      Transaction transaction = new Transaction(a.ActiveUIDocument.Document);
                      FailureHandlingOptions failOpt = transaction.GetFailureHandlingOptions();

                      failOpt.SetClearAfterRollback(true);
                      failOpt.SetFailuresPreprocessor(new NoWarningsAndErrors());
                      transaction.SetFailureHandlingOptions(failOpt);
                      if (transaction.Start("changeParameters") == TransactionStatus.Started)
                      {
                          COVER.Instance.handleMessage(m.message, m.messageType, a.ActiveUIDocument.Document, uidoc,a);
                          if (TransactionStatus.Committed != transaction.Commit())
                          {
                              // Autodesk.Revit.UI.TaskDialog.Show("Failure", "Transaction could not be committed");
                              //an error occured end resolution was cancled thus this change can't be committed.
                              // just ignore it and dont bug the user
                          }
                      }
                  }
                  }
            }

        public void idleUpdate(object sender, Autodesk.Revit.UI.Events.IdlingEventArgs e)
        {
            e.SetRaiseWithoutDelay();

              UIApplication uiapp = sender as UIApplication;
              Document doc = uiapp.ActiveUIDocument.Document;
              UIDocument uidoc = uiapp.ActiveUIDocument;

              while (COVER.Instance.messageQueue.Count > 0)
              {
              COVERMessage m = COVER.Instance.messageQueue.Dequeue();

              if ((MessageTypes)m.messageType == MessageTypes.AvatarPosition || (MessageTypes)m.messageType == MessageTypes.SetView || (MessageTypes)m.messageType == MessageTypes.Resend)//read only messages
              {
                  COVER.Instance.handleMessage(m.message, m.messageType, doc, uidoc,uiapp);
              }
              else
              {
                  Transaction transaction = new Transaction(doc);

                  FailureHandlingOptions failOpt = transaction.GetFailureHandlingOptions();

                  failOpt.SetClearAfterRollback(true);
                  failOpt.SetFailuresPreprocessor(new NoWarningsAndErrors());
                  transaction.SetFailureHandlingOptions(failOpt);

                  if (transaction.Start("changeParameters") == TransactionStatus.Started)
                  {
                      COVER.Instance.handleMessage(m.message, m.messageType, doc, uidoc,uiapp);
                      if (TransactionStatus.Committed != transaction.Commit())
                      {
                          // Autodesk.Revit.UI.TaskDialog.Show("Failure", "Transaction could not be committed");
                          //an error occured end resolution was cancled thus this change can't be committed.
                          // just ignore it and dont bug the user
                      }
                  }

              }
              }
        }

        /// <summary>
        /// The build method is called back from the child class.
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        public void Build(object sender, EventArgs e)
        {
            dynElement el = sender as dynElement;

            bool useTransaction = true;

            object[] attribs = el.GetType().GetCustomAttributes(typeof(RequiresTransactionAttribute), false);
            if (attribs.Length > 0)
            {
                if ((attribs[0] as RequiresTransactionAttribute).RequiresTransaction == false)
                {
                    useTransaction = false;
                }
            }

            #region using transaction
            if (useTransaction)
            {
                Transaction t = new Transaction(dynElementSettings.SharedInstance.Doc.Document, el.GetType().ToString() + " update.");
                TransactionStatus ts = t.Start();

                try
                {
                    FailureHandlingOptions failOpt = t.GetFailureHandlingOptions();
                    failOpt.SetFailuresPreprocessor(dynElementSettings.SharedInstance.WarningSwallower);
                    t.SetFailureHandlingOptions(failOpt);

                    el.Destroy();
                    el.Draw();

                    UpdateLayoutDelegate uld = new UpdateLayoutDelegate(CallUpdateLayout);
                    Dispatcher.Invoke(uld, System.Windows.Threading.DispatcherPriority.Background, new object[] { el });

                    elementsHaveBeenDeleted = false;

                    ts = t.Commit();

                }
                catch (Exception ex)
                {
                    Debug.WriteLine(ex.Message + " : " + ex.StackTrace);
                    dynElementSettings.SharedInstance.Bench.Log(ex.Message);

                    SetToolTipDelegate sttd = new SetToolTipDelegate(SetTooltip);
                    Dispatcher.Invoke(sttd, System.Windows.Threading.DispatcherPriority.Background,
                        new object[] { ex.Message});

                    MarkConnectionStateDelegate mcsd = new MarkConnectionStateDelegate(MarkConnectionState);
                    Dispatcher.Invoke(mcsd, System.Windows.Threading.DispatcherPriority.Background,
                        new object[] { true });

                    if (ts == TransactionStatus.Committed)
                    {
                        t.RollBack();
                    }

                    t.Dispose();

                    dynElementSettings.SharedInstance.Writer.WriteLine(ex.Message);
                    dynElementSettings.SharedInstance.Writer.WriteLine(ex.StackTrace);
                }

                try
                {
                    el.UpdateOutputs();
                }
                catch(Exception ex)
                {

                    //Debug.WriteLine("Outputs could not be updated.");
                    dynElementSettings.SharedInstance.Bench.Log("Outputs could not be updated.");
                    if (ts == TransactionStatus.Committed)
                    {
                        t.RollBack();
                    }

                    t.Dispose();

                    dynElementSettings.SharedInstance.Writer.WriteLine(ex.Message);
                    dynElementSettings.SharedInstance.Writer.WriteLine(ex.StackTrace);
                }
            }
            #endregion

            #region no transaction
            if (!useTransaction)
            {
                try
                {

                    el.Destroy();

                    el.Draw();

                    UpdateLayoutDelegate uld = new UpdateLayoutDelegate(CallUpdateLayout);
//.........这里部分代码省略.........

        /// <summary>
        /// Implementation of the command binding event for the IFC export command.
        /// </summary>
        /// <param name="sender">The event sender (Revit UIApplication).</param>
        /// <param name="args">The arguments (command binding).</param>
        public void OnIFCExport(object sender, CommandEventArgs args)
        {
            try
            {
                // Prepare basic objects
                UIApplication uiApp = sender as UIApplication;
                UIDocument uiDoc = uiApp.ActiveUIDocument;
                Document doc = uiDoc.Document;

                IFCExportConfigurationsMap configurationsMap = new IFCExportConfigurationsMap();
                configurationsMap.Add(IFCExportConfiguration.GetInSession());
                configurationsMap.AddBuiltInConfigurations();
                configurationsMap.AddSavedConfigurations(doc);

                String mruSelection = null;
                if (m_mruConfiguration != null && configurationsMap.HasName(m_mruConfiguration))
                    mruSelection =  m_mruConfiguration;

                IFCExport mainWindow = new IFCExport(configurationsMap, mruSelection);
                mainWindow.ShowDialog();

                // If user chose to continue
                if (mainWindow.Result == IFCExportResult.ExportAndSaveSettings)
                {
                    // change options
                    IFCExportConfiguration selectedConfig = mainWindow.GetSelectedConfiguration();

                    // Prepare the export options
                    IFCExportOptions exportOptions = new IFCExportOptions();
                    selectedConfig.UpdateOptions(exportOptions, uiDoc.ActiveView.Id);  

                    // prompt for the file name
                    SaveFileDialog fileDialog = new SaveFileDialog();
                    fileDialog.AddExtension = true;

                    String defaultDirectory = m_mruExportPath != null ? m_mruExportPath : null;
                    
                    if (defaultDirectory == null)
                    {
                        String revitFilePath = doc.PathName;
                        if (!String.IsNullOrEmpty(revitFilePath))
                        {
                            defaultDirectory = Path.GetDirectoryName(revitFilePath);
                        }
                    }

                    if (defaultDirectory == null)
                    {
                        defaultDirectory = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);
                    }

                    String defaultFileName = doc.Title;
                    if (String.IsNullOrEmpty(defaultFileName))
                    {
                        defaultFileName = "Project";
                    }
                    else
                    {
                        defaultFileName = Path.GetFileNameWithoutExtension(defaultFileName);
                    }
                    String defaultExtension = mainWindow.GetFileExtension();

                    fileDialog.FileName = defaultFileName;
                    fileDialog.DefaultExt = defaultExtension;
                    fileDialog.Filter = mainWindow.GetFileFilter();
                    fileDialog.InitialDirectory = defaultDirectory;
                    bool? fileDialogResult = fileDialog.ShowDialog();
                
                    // If user chose to continue
                    if (fileDialogResult.HasValue && fileDialogResult.Value)
                    {
                        // Prompt the user for the file location and path
                        String fullName = fileDialog.FileName;
                        String path = Path.GetDirectoryName(fullName);
                        String fileName = Path.GetFileName(fullName);

                        // IFC export requires an open transaction, although no changes should be made
                        Transaction transaction = new Transaction(doc, "Export IFC");   
                        transaction.Start();
                        FailureHandlingOptions failureOptions = transaction.GetFailureHandlingOptions();
                        failureOptions.SetClearAfterRollback(false);
                        transaction.SetFailureHandlingOptions(failureOptions);

                        // There is no UI option for this, but these two options can be useful for debugging/investigating
                        // issues in specific file export.  The first one supports export of only one element
                        //exportOptions.AddOption("SingleElement", "174245");
                        // The second one supports export only of a list of elements
                        //exportOptions.AddOption("ElementsForExport", "174245;205427");

                        bool result = doc.Export(path, fileName, exportOptions); // pass in the options here
                   
                        if (!result)
                        {
                            //TODO localization
                            TaskDialog taskDialog = new TaskDialog("Error exporting IFC file");
//.........这里部分代码省略.........

        public Autodesk.Revit.UI.Result Execute(Autodesk.Revit.UI.ExternalCommandData revit, ref string message, ElementSet elements)
        {
            try
            {

                //create a log file
                string tempPath = System.IO.Path.GetTempPath();
                string logPath = Path.Combine(tempPath, "dynamoLog.txt");

                if (File.Exists(logPath))
                    File.Delete(logPath);

                tw = new StreamWriter(logPath);
                tw.WriteLine("Dynamo log started " + System.DateTime.Now.ToString());

                m_revit = revit.Application;
                m_doc = m_revit.ActiveUIDocument;

                trans = new Transaction(m_doc.Document, "Dynamo");
                trans.Start();

                FailureHandlingOptions failOpt = trans.GetFailureHandlingOptions();
                failOpt.SetFailuresPreprocessor(new DynamoWarningSwallower());
                trans.SetFailureHandlingOptions(failOpt);

                m_revit.Idling += new EventHandler<IdlingEventArgs>(OnIdling);

                #region default level
                Level defaultLevel = null;
                FilteredElementCollector fecLevel = new FilteredElementCollector(m_doc.Document);
                fecLevel.OfClass(typeof(Level));
                for (int i = 0; i < fecLevel.ToElements().Count; i++)
                {
                    defaultLevel = fecLevel.ToElements()[i] as Level;
                    break;
                }

                #endregion

                DynamoWarningSwallower swallow = new DynamoWarningSwallower();

                dynElementSettings.SharedInstance.Revit = m_revit;
                dynElementSettings.SharedInstance.Doc = m_doc;
                dynElementSettings.SharedInstance.DefaultLevel = defaultLevel;
                dynElementSettings.SharedInstance.WarningSwallower = swallow;
                dynElementSettings.SharedInstance.MainTransaction = trans;
                dynElementSettings.SharedInstance.Writer = tw;
                //dynElementSettings settings = new dynElementSettings(m_revit, m_doc,
                    //defaultLevel, swallow, trans);

                //show the log
                dynamoForm = new dynBench();

                //get the window handle
                Process process = Process.GetCurrentProcess();
                new System.Windows.Interop.WindowInteropHelper(dynamoForm).Owner = process.MainWindowHandle;
                dynamoForm.Show();

                if (dynamoForm.DialogResult.HasValue && dynamoForm.DialogResult.Value == false)   //the WPF false is "cancel"
                {
                    tw.WriteLine("Dynamo log ended " + System.DateTime.Now.ToString());
                    tw.Close();

                    return Autodesk.Revit.UI.Result.Cancelled;
                }

            }
            catch (Exception e)
            {
                trans.Dispose();
                Debug.WriteLine(e.Message + ":" + e.StackTrace);
                Debug.WriteLine(e.InnerException);
                message = e.Message + " : " + e.StackTrace;

                if (tw != null)
                {
                    tw.WriteLine(e.Message);
                    tw.WriteLine(e.StackTrace);
                    tw.Close();
                }

                return Autodesk.Revit.UI.Result.Failed;
            }

            trans.Commit();

            return Autodesk.Revit.UI.Result.Succeeded;
        }

        /// <summary>
        ///     Starts a RevitAPI Transaction that will be managed by this TransactionManager instance.
        /// </summary>
        /// <param name="document">Document (DB) to start a Transaction for.</param>
        public TransactionHandle StartTransaction(Document document)
        {
            if (Transaction == null || Transaction.GetStatus() != TransactionStatus.Started)
            {
                TransactionManager.Log("Starting Transaction.");
                Transaction = new Transaction(document, "Dynamo Script");
                Transaction.Start();

                FailureHandlingOptions failOpt = Transaction.GetFailureHandlingOptions();
                failOpt.SetFailuresPreprocessor(handler);
                Transaction.SetFailureHandlingOptions(failOpt);

                RaiseTransactionStarted();
            }
            return Handle;
        }

        /// <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, Autodesk.Revit.DB.ElementSet elements)
        {
            m_revitApp = commandData.Application.Application;
            m_doc = commandData.Application.ActiveUIDocument.Document;

            Level level1 = GetLevel();
            if (level1 == null)
            {
                throw new Exception("[ERROR] Failed to get level 1");
            }

            try
            {
                //
                // Post a warning and resolve it in FailurePreproccessor
                try
                {
                    Transaction transaction = new Transaction(m_doc, "Warning_FailurePreproccessor");
                    FailureHandlingOptions options = transaction.GetFailureHandlingOptions();
                    FailurePreproccessor preproccessor = new FailurePreproccessor();
                    options.SetFailuresPreprocessor(preproccessor);
                    transaction.SetFailureHandlingOptions(options);
                    transaction.Start();
                    FailureMessage fm = new FailureMessage(m_idWarning);
                    m_doc.PostFailure(fm);
                    transaction.Commit();
                }
                catch (System.Exception)
                {
                    message = "Failed to commit transaction Warning_FailurePreproccessor";
                    return Result.Failed;
                }

                //
                // Dismiss the overlapped wall warning in FailurePreproccessor
                try
                {
                    Transaction transaction = new Transaction(m_doc, "Warning_FailurePreproccessor_OverlappedWall");
                    FailureHandlingOptions options = transaction.GetFailureHandlingOptions();
                    FailurePreproccessor preproccessor = new FailurePreproccessor();
                    options.SetFailuresPreprocessor(preproccessor);
                    transaction.SetFailureHandlingOptions(options);
                    transaction.Start();

                    Line line = m_revitApp.Create.NewLineBound(new XYZ(-10, 0, 0), new XYZ(-20, 0, 0));
                    Wall wall1 = m_doc.Create.NewWall(line, level1, false);
                    Wall wall2 = m_doc.Create.NewWall(line, level1, false);
                    m_doc.Regenerate();

                    transaction.Commit();
                }
                catch (System.Exception)
                {
                    message = "Failed to commit transaction Warning_FailurePreproccessor_OverlappedWall";
                    return Result.Failed;
                }

                //
                // Post an error and resolve it in FailuresProcessingEvent
                try
                {
                    m_revitApp.FailuresProcessing += new EventHandler<Autodesk.Revit.DB.Events.FailuresProcessingEventArgs>(FailuresProcessing);
                    Transaction transaction = new Transaction(m_doc, "Error_FailuresProcessingEvent");
                    transaction.Start();

                    Line line = m_revitApp.Create.NewLineBound(new XYZ(0, 10, 0), new XYZ(20, 10, 0));
                    Wall wall = m_doc.Create.NewWall(line, level1, false);
                    m_doc.Regenerate();

                    FailureMessage fm = new FailureMessage(m_idError);
                    FailureResolution fr = DeleteElements.Create(m_doc, wall.Id);
                    fm.AddResolution(FailureResolutionType.DeleteElements, fr);
                    m_doc.PostFailure(fm);
                    transaction.Commit();
                }
                catch (System.Exception)
                {
                    message = "Failed to commit transaction Error_FailuresProcessingEvent";
                    return Result.Failed;
                }

                //
                // Post an error and resolve it in FailuresProcessor
//.........这里部分代码省略.........