删除JSON导出功能；去掉ExportSelectedItemsAsync中残留的Task.Run

- SectionBoxExporter: 删除 ExportToJson/BuildExportData/GetFullPathName
- LayerManagementViewModel: 保存对话框去掉JSON格式选项，去掉JSON/NWD分支的Task.Run

src/Core/SectionBoxExporter.cs

@@ -4,8 +4,6 @@ using System.IO;
 using System.Linq;
 using System.Windows.Forms;
 using Autodesk.Navisworks.Api;
-using Newtonsoft.Json;
-using Newtonsoft.Json.Linq;
 using NavisworksTransport.Utils;
 using NavisApplication = Autodesk.Navisworks.Api.Application;
 
@@ -288,134 +286,6 @@ namespace NavisworksTransport.Core
                    (a.Min.Z <= b.Max.Z && a.Max.Z >= b.Min.Z);
         }
 
-        /// <summary>
-        /// 构建导出数据
-        /// </summary>
-        private JObject BuildExportData(BoundingBox3D sectionBox, List<ModelItem> objects, Document document)
-        {
-            var root = new JObject();
-            
-            // 1. 导出剖面盒信息
-            var sectionBoxInfo = new JObject
-            {
-                ["min"] = new JArray { sectionBox.Min.X, sectionBox.Min.Y, sectionBox.Min.Z },
-                ["max"] = new JArray { sectionBox.Max.X, sectionBox.Max.Y, sectionBox.Max.Z },
-                ["center"] = new JArray 
-                { 
-                    (sectionBox.Min.X + sectionBox.Max.X) / 2,
-                    (sectionBox.Min.Y + sectionBox.Max.Y) / 2,
-                    (sectionBox.Min.Z + sectionBox.Max.Z) / 2
-                },
-                ["size"] = new JArray
-                {
-                    sectionBox.Max.X - sectionBox.Min.X,
-                    sectionBox.Max.Y - sectionBox.Min.Y,
-                    sectionBox.Max.Z - sectionBox.Min.Z
-                }
-            };
-            root["sectionBox"] = sectionBoxInfo;
-
-            // 2. 导出文档信息
-            var docInfo = new JObject
-            {
-                ["fileName"] = document.FileName ?? "Unknown",
-                ["units"] = document.Units.ToString(),
-                ["exportTime"] = DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"),
-                ["objectCount"] = objects.Count
-            };
-            root["documentInfo"] = docInfo;
-
-            // 3. 导出对象列表
-            var objectsArray = new JArray();
-            foreach (var item in objects)
-            {
-                var bbox = item.BoundingBox();
-                var objInfo = new JObject
-                {
-                    ["name"] = GetFullPathName(item),
-                    ["boundingBox"] = new JObject
-                    {
-                        ["min"] = new JArray { bbox.Min.X, bbox.Min.Y, bbox.Min.Z },
-                        ["max"] = new JArray { bbox.Max.X, bbox.Max.Y, bbox.Max.Z },
-                        ["center"] = new JArray 
-                        { 
-                            (bbox.Min.X + bbox.Max.X) / 2,
-                            (bbox.Min.Y + bbox.Max.Y) / 2,
-                            (bbox.Min.Z + bbox.Max.Z) / 2
-                        },
-                        ["size"] = new JArray
-                        {
-                            bbox.Max.X - bbox.Min.X,
-                            bbox.Max.Y - bbox.Min.Y,
-                            bbox.Max.Z - bbox.Min.Z
-                        }
-                    }
-                };
-
-                // 添加Transform信息（仅非单位变换）
-                try
-                {
-                    var components = item.Transform.Factor();
-                    var rotation = components.Rotation.ToAxisAndAngle();
-                    bool isIdentity = Math.Abs(rotation.Angle) < 0.0001 && 
-                                      Math.Abs(components.Scale.X - 1) < 0.0001 &&
-                                      Math.Abs(components.Scale.Y - 1) < 0.0001 &&
-                                      Math.Abs(components.Scale.Z - 1) < 0.0001 &&
-                                      Math.Abs(components.Translation.X) < 0.0001 &&
-                                      Math.Abs(components.Translation.Y) < 0.0001 &&
-                                      Math.Abs(components.Translation.Z) < 0.0001;
-                    
-                    if (!isIdentity)
-                    {
-                        objInfo["transform"] = new JObject
-                        {
-                            ["translation"] = new JArray { components.Translation.X, components.Translation.Y, components.Translation.Z },
-                            ["rotation"] = new JObject
-                            {
-                                ["axis"] = new JArray { rotation.Axis.X, rotation.Axis.Y, rotation.Axis.Z },
-                                ["angle"] = rotation.Angle
-                            },
-                            ["scale"] = new JArray { components.Scale.X, components.Scale.Y, components.Scale.Z }
-                        };
-                    }
-                }
-                catch (Exception ex)
-                {
-                    LogManager.Debug($"获取Transform信息失败: {ex.Message}");
-                }
-
-                objectsArray.Add(objInfo);
-            }
-            root["objects"] = objectsArray;
-
-            return root;
-        }
-
-        /// <summary>
-        /// 获取对象的全路径名称
-        /// </summary>
-        private string GetFullPathName(ModelItem item)
-        {
-            if (item == null) return "";
-
-            var pathParts = new List<string>();
-            
-            // 从当前节点向上遍历到根节点
-            var current = item;
-            while (current != null)
-            {
-                string name = current.DisplayName;
-                if (!string.IsNullOrEmpty(name))
-                {
-                    pathParts.Insert(0, name);
-                }
-                current = current.Parent;
-            }
-
-            // 使用 "/" 连接路径
-            return string.Join("/", pathParts);
-        }
-
         /// <summary>
         /// 导出为NWD文件（委托给 NwdExportHelper）
         /// 适用于通用场景（如保存选择项）
@@ -446,39 +316,5 @@ namespace NavisworksTransport.Core
                 "剖面盒导出");
         }
 
-        /// <summary>
-        /// 导出为JSON文件（公开方法供外部调用）
-        /// </summary>
-        public string ExportToJson(Document document, List<ModelItem> objects, string filePath)
-        {
-            try
-            {
-                // 获取当前剖面盒边界（用于JSON中的元数据）
-                var viewpoint = document.CurrentViewpoint.Value;
-                var clipPlanes = viewpoint.ClipPlanes;
-                BoundingBox3D sectionBox = default;
-                
-                if (clipPlanes?.Enabled == true && clipPlanes.Mode == ClipPlaneSetMode.Box && clipPlanes.Box != null)
-                {
-                    var box = clipPlanes.Box;
-                    sectionBox = new BoundingBox3D(
-                        new Point3D(box.Min.X, box.Min.Y, box.Min.Z),
-                        new Point3D(box.Max.X, box.Max.Y, box.Max.Z)
-                    );
-                }
-                
-                var exportData = BuildExportData(sectionBox, objects, document);
-                string json = JsonConvert.SerializeObject(exportData, Formatting.Indented);
-                File.WriteAllText(filePath, json);
-                LogManager.Info($"[SectionBoxExporter] JSON导出完成: {objects.Count} 个对象 -> {filePath}");
-                return filePath;
-            }
-            catch (Exception ex)
-            {
-                LogManager.Error($"[SectionBoxExporter] JSON导出失败: {ex.Message}");
-                return null;
-            }
-        }
-
     }
 }

src/UI/WPF/ViewModels/LayerManagementViewModel.cs

@@ -1836,15 +1836,14 @@ namespace NavisworksTransport.UI.WPF.ViewModels
                 var document = Autodesk.Navisworks.Api.Application.ActiveDocument;
                 var originalSelection = restoreSelection ? document.CurrentSelection.SelectedItems.ToList() : null;
 
-                // 获取保存路径和导出格式
+                // 获取保存路径
                 string saveFilePath = null;
-                bool exportAsJson = false;
                 System.Windows.Application.Current.Dispatcher.Invoke(() =>
                 {
                     var saveDialog = new Microsoft.Win32.SaveFileDialog
                     {
                         Title = dialogTitle,
-                        Filter = "Navisworks文件 (*.nwd)|*.nwd|JSON文件 (*.json)|*.json",
+                        Filter = "Navisworks文件 (*.nwd)|*.nwd",
                         DefaultExt = "nwd",
                         FileName = defaultFileName
                     };
@@ -1852,9 +1851,6 @@ namespace NavisworksTransport.UI.WPF.ViewModels
                     if (saveDialog.ShowDialog() == true)
                     {
                         saveFilePath = saveDialog.FileName;
-                        // 如果用户选择了JSON（FilterIndex为2或文件扩展名为json）
-                        exportAsJson = (saveDialog.FilterIndex == 2 || 
-                                       saveFilePath.EndsWith(".json", StringComparison.OrdinalIgnoreCase));
                     }
                 });
 
@@ -1863,28 +1859,10 @@ namespace NavisworksTransport.UI.WPF.ViewModels
                     return;
                 }
 
-                bool exportResult = false;
-                string errorMessage = "";
-
-                if (exportAsJson)
-                {
-                    // JSON导出（使用 SectionBoxExporter）
-                    var exporter = new SectionBoxExporter();
-                    await Task.Run(() =>
-                    {
-                        var result = exporter.ExportToJson(document, items, saveFilePath);
-                        exportResult = !string.IsNullOrEmpty(result);
-                    });
-                }
-                else
-                {
-                    // NWD导出（使用 NwdExportHelper）
-                    await Task.Run(() =>
-                    {
-                        var result = NwdExportHelper.ExportToNwd(items, saveFilePath);
-                        exportResult = !string.IsNullOrEmpty(result);
-                    });
-                }
+                // NWD导出
+                var result = NwdExportHelper.ExportToNwd(items, saveFilePath);
+                bool exportResult = !string.IsNullOrEmpty(result);
+                string errorMessage = result == null ? "导出失败" : "";
 
                 // 恢复原始选择（如果需要）
                 if (restoreSelection && originalSelection != null)
@@ -1909,16 +1887,14 @@ namespace NavisworksTransport.UI.WPF.ViewModels
                     if (File.Exists(saveFilePath))
                     {
                         var fileInfo = new FileInfo(saveFilePath);
-                        string format = exportAsJson ? "JSON" : "NWD";
                         MessageBox.Show(
-                            $"{format}导出成功！\n\n文件: {saveFilePath}\n大小: {fileInfo.Length / 1024} KB",
+                            $"NWD导出成功！\n\n文件: {saveFilePath}\n大小: {fileInfo.Length / 1024} KB",
                             "导出结果", MessageBoxButton.OK, MessageBoxImage.Information);
                     }
                 }
                 else
                 {
-                    string format = exportAsJson ? "JSON" : "NWD";
-                    MessageBox.Show($"{format}导出失败: {errorMessage}", "导出错误", MessageBoxButton.OK, MessageBoxImage.Error);
+                    MessageBox.Show($"NWD导出失败: {errorMessage}", "导出错误", MessageBoxButton.OK, MessageBoxImage.Error);
                 }
             }
             catch (Exception ex)