public IComparer <T> CreateCompoundComparer(IComparer <T> comparer)
{
CompoundComparer <T> compoundComparer = new CompoundComparer <T>();
compoundComparer.AppendComparison(Comparer);
compoundComparer.AppendComparison(comparer);
return(KeyedNullPlacementComparer <T, TKey> .GetComparer(compoundComparer.Normalize(), _keySelector, NullFilter.NullsFirst));
}
public static IComparer <T> GetComparer(IComparer <T> baseComparer, IComparer <T> nextComparer)
{
// make sure null comparer stays highest precedence
IPrecedenceEnforcer <T> nullComparer = baseComparer as IPrecedenceEnforcer <T>;
if (nullComparer != null)
{
return(nullComparer.CreateCompoundComparer(nextComparer));
}
CompoundComparer <T> comparer = new CompoundComparer <T>();
comparer.AppendComparison(baseComparer);
comparer.AppendComparison(nextComparer);
return(comparer.Normalize());
}