c# - LINQ 可以用于查找排序列表中的间隙吗？

Question

我是否有可能以允许我确定“9”的方式使用 LINQ 是排序列表中的第一个缺失值而不使用 for 循环并将每个值与相邻值进行比较？

var listStringVals = new [] { "7", "13", "8", "12", "10", "11", "14" };
// sort list to "7","8","10","11","12","13","14"
var sortedList = listStringVals.OrderBy(c => int.Parse(c)).ToList();
// need some magic here to get the first gap in the sorted list

Answer 1

让

var strings = new string[] { "7", "13", "8", "12", "10", "11", "14" };

然后

var list = Array.ConvertAll(strings, s => Int32.Parse(s)).OrderBy(i => i);
// or
var list = strings.Select(s => int.Parse(s)).OrderBy(i => i);
// or
var list = strings.OrderBy(s => int.Parse(s));

(注意 this 问题)

然后

var result = Enumerable.Range(list.Min(), list.Count).Except(list).First(); // 9
// or
int min = list.Min(), max = list.Max();
var result = Enumerable.Range(min, max - min + 1).Except(list).First();