The db.GetHostDwgXrefGraph() method returns the Xref hierarchy for the current drawing as an XrefGraph object. Here’s a simple code snippet to demonstrate its use – in this case to print the Xref structure of the current drawing to the command line.
XrefGraph Command and Recursive Helper
[CommandMethod("XrefGraph")]
public static void XrefGraph()
{
Document doc = Application.DocumentManager.MdiActiveDocument;
Database db = doc.Database;
Editor ed = doc.Editor;
using (Transaction Tx = db.TransactionManager.StartTransaction())
{
ed.WriteMessage("\n---Resolving the XRefs------------------");
db.ResolveXrefs(true, false);
XrefGraph xg = db.GetHostDwgXrefGraph(true);
ed.WriteMessage("\n---XRef's Graph-------------------------");
ed.WriteMessage("\nCURRENT DRAWING");
GraphNode root = xg.RootNode;
printChildren(root, "|-------", ed, Tx);
ed.WriteMessage("\n----------------------------------------\n");
}
}
// Recursively prints out information about the XRef's hierarchy
private static void printChildren(GraphNode i_root, string i_indent, Editor i_ed, Transaction i_Tx)
{
for (int o = 0; o < i_root.NumOut; o++)
{
XrefGraphNode child = i_root.Out(o) as XrefGraphNode;
if (child.XrefStatus == XrefStatus.Resolved)
{
BlockTableRecord bl = i_Tx.GetObject(child.BlockTableRecordId, OpenMode.ForRead) as BlockTableRecord;
i_ed.WriteMessage("\n" + i_indent + child.Database.Filename);
// Name of the Xref (found name)
// You can find the original path too:
// if (bl.IsFromExternalReference == true)
// i_ed.WriteMessage("\n" + i_indent + "Xref path name: " + bl.PathName);
printChildren(child, "| " + i_indent, i_ed, i_Tx);
}
}
}
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