C#/AutoCAD 2018/ObjectArx/二次开发再说实体（六）

C#/AutoCAD 2018/ObjectArx/二次开发再说实体（六）

这些函数对大家很有用，如果想获取详细源代码请加云幽学院yunyou.ke.qq.com报名免费课程，如果想学习更系统、更全面的知识请报名收费课程，有大量开发案例共享。
1、获取模型空间中所有实体
 #region "获取模型空间中所有实体"
        /// <summary>
        /// 获取模型空间中所有实体
        /// </summary>
        /// <param name=""></param>
        /// <returns>实体ID的列表</returns>
        public List<Autodesk.AutoCAD.DatabaseServices.ObjectId> GetEntitiesInModelSpace()
        {
            List<Autodesk.AutoCAD.DatabaseServices.ObjectId> objects =
                new List<Autodesk.AutoCAD.DatabaseServices.ObjectId>();
 
            using (Autodesk.AutoCAD.DatabaseServices.Transaction transaction =
            Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.
            MdiActiveDocument.TransactionManager.StartTransaction())
            {
                Autodesk.AutoCAD.DatabaseServices.BlockTable blockTable =
                (Autodesk.AutoCAD.DatabaseServices.BlockTable)transaction.GetObject(
                Autodesk.AutoCAD.DatabaseServices.HostApplicationServices.WorkingDatabase.BlockTableId,
                Autodesk.AutoCAD.DatabaseServices.OpenMode.ForRead);
                Autodesk.AutoCAD.DatabaseServices.BlockTableRecord blockTableRecord =
                (Autodesk.AutoCAD.DatabaseServices.BlockTableRecord)transaction.GetObject(
                blockTable[Autodesk.AutoCAD.DatabaseServices.BlockTableRecord.ModelSpace],
                Autodesk.AutoCAD.DatabaseServices.OpenMode.ForRead);
                foreach (Autodesk.AutoCAD.DatabaseServices.ObjectId objId in blockTableRecord)
                {
                    objects.Add(objId);
                }
                transaction.Commit();
            }
            return objects;
        }
        #endregion
 
2、获取实体
        #region "获取实体"
        /// <summary>
        /// 获取实体
        /// </summary>
        /// <param name="ObjectId"></param>
        /// <returns>DBObject</returns>
        private DBObject GetObject(ObjectId id)
        {
            DBObject obj = null;
            using (Transaction transaction = Application.DocumentManager.
                MdiActiveDocument.TransactionManager.StartTransaction())
            {
                obj = transaction.GetObject(id,
                    Autodesk.AutoCAD.DatabaseServices.OpenMode.ForRead, true);
                transaction.Commit();
            }
            return obj;
        }
        #endregion
 
3、给实体添加XData
        #region "如何给实体添加XData"
        /// <summary>
        /// 如何给实体添加XData
        /// </summary>
        /// <param name="DBObject，int"></param>
        /// <returns>bool</returns>
        public static bool AttachXData(DBObject obj, int MyData)
        {
            RegAppTableRecord app = new RegAppTableRecord();
            app.Name = "云幽学院";
            using (Transaction transaction =
            Application.DocumentManager.MdiActiveDocument.TransactionManager.StartTransaction())
            {
                try
                {
                    Database workingdatabase = HostApplicationServices.WorkingDatabase;
 
                    SymbolTable table = (SymbolTable)transaction.GetObject(workingdatabase.RegAppTableId,
                    Autodesk.AutoCAD.DatabaseServices.OpenMode.ForWrite, false);
                    if (!table.Has(app.Name))
                    {
                        table.Add(app);
                        transaction.AddNewlyCreatedDBObject(app, true);
                    }
                    if (!obj.IsWriteEnabled)
                        obj.UpgradeOpen();
                    obj.XData = new ResultBuffer(
                    new TypedValue((int)DxfCode.ExtendedDataRegAppName, app.Name),
                    new TypedValue((int)DxfCode.ExtendedDataInteger32, MyData));
                    transaction.Commit();
                    transaction.Dispose();
                }
                catch
                {
                    return false;
                }
            }
            return true;
        }
 
        #endregion