public static IEnumerable <T> Subtraction <T>(IEnumerable <T> enumerable1, IEnumerable <T> enumerable2, Comparison <T> compare = null)
{
XContract.ArgIsNotNull(enumerable1, nameof(enumerable1));
XContract.ArgIsNotNull(enumerable2, nameof(enumerable2));
if (compare == null)
{
compare = (x, y) => Obj.AreEquals(x, y) ? 0 : 1;
}
enumerable1 = enumerable1.ToList();
if (!enumerable1.Any())
{
return(new T[0]);
}
enumerable2 = enumerable2.ToList();
var result = new List <T>();
ForEach(
enumerable1,
c =>
{
// ReSharper disable SimplifyLinqExpression
if (!enumerable2.Any(x => compare(c, x) == 0))
// ReSharper restore SimplifyLinqExpression
{
result.Add(c);
}
});
return(result.ToArray());
}