private static int Compare(object left, object right)
{
if (left == null)
{
left = "null";
}
if (right == null)
{
right = "null";
}
TypePair p = new TypePair(left.GetType(), right.GetType());
if (comparers.ContainsKey(p))
{
return(comparers[p](left, right));
}
p.Swap();
if (comparers.ContainsKey(p))
{
return(-comparers[p](right, left));
}
return(-string.Compare(right.ToString(), left.ToString()));
}