检查是否列出 <List<string> &gt;包含一个字符串

Question

How can I check if any List<string> s in a List contain a given string? I know how to do this with a loop, but is there a way with LINQ/in one line?

Answer 1

if (lists.Any(sublist => sublist.Contains(str)))

Answer 2

var t=lists.SelectMany(f=>f).Contains("str");

full sample :

var lists = new List<List<string>>();

lists.Add(new List<string>(){"a","b"});
lists.Add(new List<string>(){"b","2"});
lists.Add(new List<string>(){"c","5"});
lists.Add(new List<string>(){"d","7"});

var t=lists.SelectMany(f=>f);

t.Dump();

if (t.Contains("k")) 
  Console.WriteLine ("yes") ;
else 
  Console.WriteLine ("no");

result

no

ps

ofcourse - this can be shorten to :

if (lists.SelectMany(f=>f).Contains("k"))...

Answer 3

你可以这样做：

bool ifExists = list.Any(x => x.Contains(yourString));

Answer 4

只是为了添加现有答案，鉴于您的列表已排序且大， BinarySearch可能比Contains或Any产生更快。