Copy Objects Between Databases (.NET)

You can copy objects between two databases with the WblockCloneObjects method. The WblockCloneObjects method is a member of the Database object.

Note: Do not use the CopyFrom method to copy objects between two databases.

The WblockCloneObjects method requires the following parameters:

• ObjectIdCollection - List of objects to be cloned.
• ObjectId - ObjectId of the new parent object for the objects being cloned.
• IdMapping - Data structure of the current and new ObjectIds for the objects being cloned.
• DuplicateRecordCloning - Determines how duplicate objects should be handled.
• Defer Translation - Controls if object ids should be translated.

Copy an object from one database to another

This example creates two Circle objects, then uses the WblockCloneObjects method to copy the circles into a new drawing. The example also creates a new drawing using the acad.dwt file before the circles are copied.

C# Example

using Autodesk.AutoCAD.Runtime;
using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.Geometry;
 
[CommandMethod("CopyObjectsBetweenDatabases", CommandFlags.Session)]
public static void CopyObjectsBetweenDatabases()
{
    ObjectIdCollection acObjIdColl = new ObjectIdCollection();

    // Get the current document and database
    Document acDoc = Application.DocumentManager.MdiActiveDocument;
    Database acCurDb = acDoc.Database;

    // Lock the current document
    using (DocumentLock acLckDocCur = acDoc.LockDocument())
    {
        // Start a transaction
        using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction())
        {
            // Open the Block table record for read
            BlockTable acBlkTbl;
            acBlkTbl = acTrans.GetObject(acCurDb.BlockTableId,
                                         OpenMode.ForRead) as BlockTable;

            // Open the Block table record Model space for write
            BlockTableRecord acBlkTblRec;
            acBlkTblRec = acTrans.GetObject(acBlkTbl[BlockTableRecord.ModelSpace],
                                            OpenMode.ForWrite) as BlockTableRecord;

            // Create a circle that is at (0,0,0) with a radius of 5
            using (Circle acCirc1 = new Circle())
            {
                acCirc1.Center = new Point3d(0, 0, 0);
                acCirc1.Radius = 5;

                // Add the new object to the block table record and the transaction
                acBlkTblRec.AppendEntity(acCirc1);
                acTrans.AddNewlyCreatedDBObject(acCirc1, true);

                // Create a circle that is at (0,0,0) with a radius of 7
                using (Circle acCirc2 = new Circle())
                {
                    acCirc2.Center = new Point3d(0, 0, 0);
                    acCirc2.Radius = 7;

                    // Add the new object to the block table record and the transaction
                    acBlkTblRec.AppendEntity(acCirc2);
                    acTrans.AddNewlyCreatedDBObject(acCirc2, true);

                    // Add all the objects to copy to the new document
                    acObjIdColl = new ObjectIdCollection();
                    acObjIdColl.Add(acCirc1.ObjectId);
                    acObjIdColl.Add(acCirc2.ObjectId);
                }
            }

            // Save the new objects to the database
            acTrans.Commit();
        }

        // Unlock the document
    }

    // Change the file and path to match a drawing template on your workstation
    string sLocalRoot = Application.GetSystemVariable("LOCALROOTPREFIX") as string;
    string sTemplatePath = sLocalRoot + "Template\\acad.dwt";

    // Create a new drawing to copy the objects to
    DocumentCollection acDocMgr = Application.DocumentManager;
    Document acNewDoc = acDocMgr.Add(sTemplatePath);
    Database acDbNewDoc = acNewDoc.Database;

    // Lock the new document
    using (DocumentLock acLckDoc = acNewDoc.LockDocument())
    {
        // Start a transaction in the new database
        using (Transaction acTrans = acDbNewDoc.TransactionManager.StartTransaction())
        {
            // Open the Block table for read
            BlockTable acBlkTblNewDoc;
            acBlkTblNewDoc = acTrans.GetObject(acDbNewDoc.BlockTableId,
                                               OpenMode.ForRead) as BlockTable;

            // Open the Block table record Model space for read
            BlockTableRecord acBlkTblRecNewDoc;
            acBlkTblRecNewDoc = acTrans.GetObject(acBlkTblNewDoc[BlockTableRecord.ModelSpace],
                                                  OpenMode.ForRead) as BlockTableRecord;

            // Clone the objects to the new database
            IdMapping acIdMap = new IdMapping();
            acCurDb.WblockCloneObjects(acObjIdColl, acBlkTblRecNewDoc.ObjectId, acIdMap,
                                       DuplicateRecordCloning.Ignore, false);

            // Save the copied objects to the database
            acTrans.Commit();
        }

        // Unlock the document
    }

    // Set the new document current
    acDocMgr.MdiActiveDocument = acNewDoc;
}