Engine中如何使用scenecontrol保存sxd文件？

  

                        //save sxd

                        IMemoryBlobStream mbStream = new MemoryBlobStreamClass();

                        IObjectStream objectStream = new ObjectStreamClass();

                        objectStream.Stream = mbStream;

                        IPersistStream persistStream = (ESRI.ArcGIS.esriSystem.IPersistStream)axSceneControl1.Scene;

                        persistStream.Save(objectStream, 1);



                        saveFileDialog1.Title = 保存Scene文档;

                        saveFileDialog1.Filter = 保存Scene文档(*.sxd)|*.sxd;

                        saveFileDialog1.ShowDialog();

                        string filename = saveFileDialog1.FileName;



                        mbStream.SaveToFile(filename);

                        MessageBox.Show(OK);



            //open engine-saved sxd

            openFileDialog1.Title = 打开Scene文档;

            openFileDialog1.Filter = Scene文档(*.sxd)|*.sxd;

            openFileDialog1.ShowDialog();

            string filename = openFileDialog1.FileName;

            if (axSceneControl1.CheckSxFile(filename))

                axSceneControl1.LoadSxFile(filename);

            else

            {

                IScene pScene = axSceneControl1.Scene;

                IMemoryBlobStream mbStream = new MemoryBlobStreamClass();

                IObjectStream objectStream = new ObjectStreamClass();

                mbStream.LoadFromFile(filename);

                IPersistStream pPersistStream = (ESRI.ArcGIS.esriSystem.IPersistStream)pScene;

                objectStream.Stream = mbStream;

                pPersistStream.Load(objectStream);                

            }