public static bool SetAttributeReferenceValue(this BlockReference block, string attTag, string val)
{
bool result = false;
using (Transaction tr = HostApplicationServices.WorkingDatabase.TransactionManager.StartTransaction())
{
var atts = block.AttributeCollection.Cast <ObjectId>()
.Select(id => (AttributeReference)tr.GetObject(id, OpenMode.ForRead));
AttributeReference attref = atts.FirstOrDefault(a => a.Tag.ToUpper() == attTag.ToUpper());
if (attref != null)
{
attref.UpgradeOpen();
if (attref.HasFields)
{
attref.RemoveField();
}
attref.TextString = val;
result = true;
}
tr.Commit();
}
return(result);
}