AutoCAD .NET: 遍历模型空间

原文：http://spiderinnet1.typepad.com/blog/2012/06/autocad-net-iterate-through-model-space.html

[CommandMethod("ModelSpaceIterator")]
public static void ModelSpaceIterator_Method()
{
    Database database = HostApplicationServices.WorkingDatabase;
    using (Transaction transaction = database.TransactionManager.StartTransaction())
    {
        BlockTableRecord btRecord = (BlockTableRecord)transaction.GetObject(SymbolUtilityServices.GetBlockModelSpaceId(database), OpenMode.ForRead);
        foreach (ObjectId id in btRecord)
        {
            Entity entity = (Entity)transaction.GetObject(id, OpenMode.ForRead);
            //Access to the entity
            MgdAcApplication.DocumentManager.MdiActiveDocument.Editor.WriteMessage(string.Format("\nHandle: {0}", entity.Handle));
        }
        transaction.Commit();
    }
}