void LoadModel()
        {
            //清空当前的结构树信息
            treeView1.Nodes.Clear();
            //当前加载的模型
            Document doc = Autodesk.Navisworks.Api.Application.ActiveDocument;
            
            //循环现有模型
            foreach (var documentModel in doc.Models)
            {
              
                var modelItemList = documentModel.RootItem.Descendants;
                Model model = documentModel;
                var modelItems = modelItemList.Where(o => o.Parent == model.RootItem);
           
                if (modelItems.Any())
                {
                    TreeNode cNode;
                    foreach (var quItem in modelItems)
                    {
                         cNode = new TreeNode(quItem.DisplayName);
                        cNode.Tag = quItem;
                       // cNode.Text = quItem.DisplayName;//判断名称
                        treeView1.Nodes.Add(cNode);
                        if (quItem.Children.Any())
                        {
                            LoadChild(quItem.Children, quItem, cNode);   
                        }
           
                      
                    }
                }
                
            }
  
        }

        /// <summary>
        /// 递归判断结构树信息
        /// </summary>
        /// <param name="modelItemEnumerableCollection">数据源信息</param>
        /// <param name="parentItem">父级节点信息</param>
        /// <param name="pNode">子节点信息</param>
        private void LoadChild(IEnumerable<ModelItem> modelItemEnumerableCollection, ModelItem parentItem, TreeNode pNode)
        {
            var query = modelItemEnumerableCollection.Where(o => o.Parent == parentItem);
            if (query.Count()>0)
            {
                foreach (var quItem in query)
                {
                    TreeNode chNode = new TreeNode(quItem.DisplayName);
                    chNode.Tag = quItem;
                    pNode.Nodes.Add(chNode);
                    if (quItem.Children.Any())
                    {
                        LoadChild(quItem.Children, quItem, chNode);
                    }
                  
                }
            }
        }

       void treeView1_NodeMouseClick(object sender, TreeNodeMouseClickEventArgs e)
        {
            TreeNode node = e.Node;
            if (node != null)
            {
                ModelItem oCurrentNode = (ModelItem)node.Tag;
                propertyGrid1.SelectedObject = oCurrentNode;
                if (oCurrentNode != null)
                {

                    //设置选择集合
                    ModelItemCollection oMC = new ModelItemCollection();
                    oMC.Add(oCurrentNode);
                    Document oDoc = view.ViewControl.DocumentControl.Document;
                    //设置选中
                    oDoc.CurrentSelection.CopyFrom(oMC);
                }
          }
        }