Detaching missing external reference files from side database

<?xml encoding=”UTF-8″>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:xrefRectHost.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);
}
}