An exception pops up when reloading xref block and the dwg file is opened via ReadDwgFile method

[travisluo]

I have written the following code snipt to reload one dwg xref, an exception is thrown when reloading. I don't know any better way to implement this function, I appreciate very much if you could provide me any suggestion, comment or idea. Thanks a lot

            AcadDatabase acadDB = null;
            Database db = new Database();
            XrefGraph Xref = null;
            XrefGraphNode XrefNode = null;
            Transaction trans = null;
            BlockTable Btable = null;
            BlockTableRecord BTrecord = null;
            try
            {
                db.ReadDwgFile(@"C:\MEP\All.dwg", FileShare.ReadWrite, false, "");
                Xref = db.GetHostDwgXrefGraph(true);
                acadDB = db.AcadDatabase as AcadDatabase;
                for (int k = 1; k < Xref.NumNodes; k++)
                {
                    trans = db.TransactionManager.StartTransaction();
                    XrefNode = Xref.GetXrefNode(k);
                    try
                    {
                        acadDB.Blocks.Item(XrefNode.Name).Reload();
                    }
                    catch (System.Exception e)
                    {
                         // an exception is thrown here, it said that:" Catastrophic failure(Exception is form HRESULT:0x8000FFFF (E_UNEXPECTED))     
                    }

                    trans.Commit();
                    trans.Dispose();
                }
                db.Save();
            }
            finally
            {
                db.CloseInput(true);
            }

[T.Willey]

For one thing, you can't use the Save method on the database. You have to use the SaveAs method.

[Ed Jobe]

You may want to use IsXref before trying to reload it. The object might just be a block or an unresolved xref.

[travisluo]

I have modified the code,
try
{
AcadBlock bl = acadDB.Blocks.Item(XrefNode.Name);
if (bl.IsXRef)
{
bl.Reload();
}
}
catch (System.Exception e)
{
// the exception is thrown again.
// it said that:" Catastrophic failure(Exception is form HRESULT:0x8000FFFF (E_UNEXPECTED))
}