diff --git a/PDF3D.Addin/ExportCmd.cs b/PDF3D.Addin/ExportCmd.cs
index d33f330..0d0f01a 100644
--- a/PDF3D.Addin/ExportCmd.cs
+++ b/PDF3D.Addin/ExportCmd.cs
@@ -9,6 +9,7 @@ using System.Collections.Generic;
 using System.IO;
 using System.Linq;
 using System.Reflection;
+using System.Windows;
 
 namespace PDF3D.Addin
 {
@@ -23,7 +24,25 @@ namespace PDF3D.Addin
 
             try
             {
-                var elems = uIDocument.Selection.PickObjects(Autodesk.Revit.UI.Selection.ObjectType.Element).Select(x => doc.GetElement(x)).ToList();
+                List<Element> elems = new List<Element>();
+                FilteredElementCollector collector = new FilteredElementCollector(doc).WhereElementIsNotElementType();
+                foreach (Element e in collector)
+                {
+                    if (e.Category != null)
+                    {
+                        if (e.Category.HasMaterialQuantities)
+                        {
+                            elems.Add(e);
+                        }
+                        else
+                        {
+                            if (e.Category.IsCuttable)
+                            {
+                                elems.Add(e);
+                            }
+                        }
+                    }
+                }
 
                 SaveFileDialog fileDialog = new SaveFileDialog()
                 {
@@ -60,11 +79,12 @@ namespace PDF3D.Addin
                     iDTFBuilder.Export(idtf);
                     iDTFBuilder.ExportView(view);
                     GeneratePDF(idtf, view, fileDialog.FileName);
+                    MessageBox.Show("导出完成");
                 }
             }
-            catch
+            catch(Exception ex)
             {
-
+                MessageBox.Show(ex.Message,"导出失败");
             }
 
             return Result.Succeeded;