Topic: Setting attribute value in nested block

[cannorth]

Hello,

  Could someone please send code for setting an attribute value in a nested block?

Thanks,

cannorth

[gile]

Hi,

You have to scan the owner BlockTableRecord looking for the BlockReference which contains the attribute and then iterate the BlockReference AttributeCollection to find the AttributeReference you want to change the value.

Doing this the change will affect all references of the owner block.

[cannorth]

Can someone show me a code snippet?

Thanks,

cannorth

[gile]

Here's a quick and dirty.

Replace the parent and nested block names, the attribute tag and the attribute value as you need.

Code - C#: [Select]

1.         [CommandMethod("Test")]
2.         public void Test()
3.         {
4.             Document doc = AcAp.DocumentManager.MdiActiveDocument;
5.             Database db = doc.Database;
6.             Editor ed = doc.Editor;
7.             using (Transaction tr = db.TransactionManager.StartTransaction())
8.             {
9.                 BlockTable bt = (BlockTable)tr.GetObject(db.BlockTableId, OpenMode.ForRead);
10.                 if (!bt.Has("parent")) return; // Replace "parent" by the parent block name
11.                 BlockTableRecord btr =
12.                     (BlockTableRecord)tr.GetObject(bt["parent"], OpenMode.ForRead);
13.                 foreach (ObjectId id in btr)
14.                 {
15.                     BlockReference br = tr.GetObject(id, OpenMode.ForRead) as BlockReference;
16.                     if (br != null && br.Name == "nested") // replace "nested" withe the nested block name
17.                     {
18.                         foreach (ObjectId attId in br.AttributeCollection)
19.                         {
20.                             AttributeReference att =
21.                                 (AttributeReference)tr.GetObject(attId, OpenMode.ForRead);
22.                             if (att.Tag == "TAG") // replace "TAG" with the attribute tag
23.                             {
24.                                 att.UpgradeOpen();
25.                                 att.TextString = "foo"; // repace "foo" with the new attribute value
26.                                 break;
27.                             }
28.                         }
29.                         break;
30.                     }
31.                 }
32.                 tr.Commit();
33.             }
34.             ed.Regen();
35.         }