Detaching missing external reference files from side database

By Virupaksha Aithal

Below code shows the procedure to detach the missing external reference files from a side database

[CommandMethod("DetachXref")]
public void detach_xref()
{
    Document Doc = Application.DocumentManager.MdiActiveDocument;
    Editor ed = Doc.Editor;
    string mainDrawingFile = @"C:\xref\RectHost.dwg";
    using(Database db = new Database(false, false))
    {
        try
        {
            db.ReadDwgFile(mainDrawingFile, System.IO.FileShare.ReadWrite, false, "");
        }
        catch (System.Exception)
        {
            ed.WriteMessage("\nUnable to read the drawingfile.");
            return;
        }
        bool saveRequired = false;
        db.ResolveXrefs(true, false);
        using (Transaction tr = db.TransactionManager.StartTransaction())
        {
            XrefGraph xg = db.GetHostDwgXrefGraph(true);
            int xrefcount = xg.NumNodes;
            for (int j = 0; j < xrefcount; j++)
            {
                XrefGraphNode xrNode = xg.GetXrefNode(j);
                String nodeName = xrNode.Name;
                if (xrNode.XrefStatus == XrefStatus.FileNotFound)
                {
                    ObjectId detachid = xrNode.BlockTableRecordId;
                    db.DetachXref(detachid);
                    saveRequired = true;
                    ed.WriteMessage("\nDetached successfully");
                    break;
                }
            }
            tr.Commit();
        }
        if (saveRequired)
            db.SaveAs(mainDrawingFile, DwgVersion.Current);
    }
}