public static IEnumerable<IEnumerable<int>> GroupConsecutive(this IEnumerable<int> list) {
var group = new List<int>();
foreach (var i in list) {
if (group.Count == 0 || i - group[group.Count - 1] <= 1)
group.Add(i);
else {
yield return group;
group = new List<int> {i};
}
}
yield return group;
}
你可以这样使用它:
var numbers = new[] { 1, 2, 3, 4, 6, 7, 9 };
var groups = numbers.GroupConsecutive();
public static class EnumerableExtensions
{
public static IEnumerable<IEnumerable<int>> GroupConsecutive(this IEnumerable<int> list)
{
if (list.Any())
{
var count = 1;
var startNumber = list.First();
int last = startNumber;
foreach (var i in list.Skip(1))
{
if (i < last)
{
throw new ArgumentException($"List is not sorted.", nameof(list));
}
if (i - last == 1)
count += 1;
else
{
yield return Enumerable.Range(startNumber, count);
startNumber = i;
count = 1;
}
last = i;
}
yield return Enumerable.Range(startNumber, count);
}
}
}