使用linq把List>合并成List

[mnxm]

把
var ll = new List<List<string>>()
{
new List<string>(){ "a","b","c" },
new List<string>(){ "d","e","f" },
new List<string>(){ "g","h","i" }
};

合并成

var l = new List<string>(){ "a","b","c","d","e","f","g","h","i" };

使用Linq如何实现呢？

[mnxm]

引用 1 楼 ajianchina 的回复:

var l = ll.SelectMany(p => p).ToList();

原来如此 愚蠢的我还 foreach (var sublist in list) { foreach (var item in sublist) { yield return item; } } 这样搞呢 谢谢！

[ajianchina]

var l = ll.SelectMany(p => p).ToList();