插件的启动入口.     //插件描述     [PluginAttribute("BJYTTakeOff","ADSK",DisplayName = "工程量查看")]     public class AddinActvitor : AddInPlugin    {        //执行        public override int Execute(params string[] parameters)        {            FrmTakeOff takeOff=new FrmTakeOff();            takeOff.ShowDialog();            return 0;        }    }

 try            {                //获取工程量对象                if (Autodesk.Navisworks.Api.Application.MainDocument != null)                {                    DocumentTakeoff docTakeoff =  Autodesk.Navisworks.Api.Application.MainDocument.GetTakeoff();                    //获取条目表                    //    ItemTable table = docTakeoff.Items;                    //开始数据库操作                    if (docTakeoff != null)                    {                        using (NavisworksCommand cmd = docTakeoff.Database.Value.CreateCommand())                        {                            //SQL句法                            // TK_ITEM是条目表在数据库中的名字                            cmd.CommandText = "SELECT ID,Parent,Name FROM TK_ITEM";                            //读取数据库                            DataTable dt = new DataTable();                            NavisworksDataAdapter sdAdapter = new NavisworksDataAdapter(cmd);                            sdAdapter.Fill(dt);                            if (dt.Rows.Count > 0)                            {                                treeList1.DataSource = dt;                            }                        }                    }                }            }            catch (Exception ex)            {                MessageBox.Show(ex.ToString());            }