New Post: Stress test of XSSF proves exponential time (performance concerns)

Update:

I've tried to update the source code and it helped. Data export in my application duration reduced from 7 minutes to several seconds.

XSSFRow.cs:

private SortedList<int, ICell> _cells;

int GetFirstKey(IList<int> keys) {
        return keys[0];
    }
int GetLastKey(IList<int> keys) {
        return keys[keys.Count - 1];
    }

and some type updates, on few places, where it was necessary for compilation (all in XSSFRow.cs).

Libor.