public static IEnumerable <TSource> Distinct <TSource>(IEnumerable <TSource> source, IEqualityComparer <TSource> comparer = null)
{
var _result = new List <TSource>();
EnumerableUtil.Each(source, x => {
if (EnumerableUtil.FirstOrDefault(_result, y => comparer != null ? comparer.Equals(x, y) : x.Equals(y)) == null)
{
_result.Add(x);
}
});
return(_result);
}
public static int Find <TSource>(IEnumerable <TSource> source, Func <TSource, bool> predicate, int defaultValue)
{
var _index = -1;
if (EnumerableUtil.FirstOrDefault(source, x => {
_index++;
return(predicate(x));
}) == null)
{
return(defaultValue);
}
return(_index);
}
public static IEnumerable <TSource> Except <TSource>(IEnumerable <TSource> first, IEnumerable <TSource> second, IEqualityComparer <TSource> comparer = null)
{
return(EnumerableUtil.Where(first, x => EnumerableUtil.FirstOrDefault(second, y => comparer != null ? comparer.Equals(x, y) : x.Equals(y)) == null));
}
