Navisworks二次开发——根据属性值筛选出图元

try
            {
                IList list = new List();
                foreach (var item in Autodesk.Navisworks.Api.Application.ActiveDocument.CurrentSelection.SelectedItems)
                {
                    var cat = item.DescendantsAndSelf.Where(i => i.PropertyCategories.FindCategoryByDisplayName("元素") != null);
                    var pro = cat.Where(m => m.PropertyCategories.FindCategoryByDisplayName("元素").Properties.FindPropertyByDisplayName("族") != null);
                    foreach (ModelItem m in pro)
                    {
                        if (GetPropertyValue(m.PropertyCategories.FindCategoryByDisplayName("元素").Properties.FindPropertyByDisplayName("族")) == "条形窗")
                        {
                            list.Add(m);
                        }
                    }          
                }
                MessageBox.Show(list.Count.ToString());
                Autodesk.Navisworks.Api.Application.ActiveDocument.CurrentSelection.Clear();
                Autodesk.Navisworks.Api.Application.ActiveDocument.CurrentSelection.AddRange(list);
                return 0;
            }
            catch (Exception ex)
            {
                System.Windows.Forms.MessageBox.Show(ex.Message);//输出显示异常信息
                return 0;
            }