ExceptWithDuplicates
Returns a List of T except what's in a second list, without doing a distinct
Source
public static List<TSource> ExceptWithDuplicates<TSource>(this IEnumerable<TSource> first, IEnumerable<TSource> second)
{
List<TSource> s1 = second.ToList();
List<TSource> ret = new List<TSource>();
first.ToList().ForEach(n =>
{
if (s1.Contains(n))
s1.Remove(n);
else
ret.Add(n);
});
return ret;Example
void Main()
{
List<int> a = new List<int> {1,8,8,3};
List<int> b = new List<int> {1,8,3};
var x = a.ExceptWithDuplicates(b); //returns list with a single element: 8
var y = a.Except(b); //returns an empty list
}