Dictionary search with Linq

we can search dictionary like

var dictionary = new Dictionary<string,string>();
dictionary.Keys.Where( key => key.Contains("a")).ToList();

but it return list. i want that linq should 开发者_如何学编程return true or false. so what would be the right code that search dictionary with linq. please guide.

Use the Any() operator:

dictionary.Keys.Where(key => key.Contains("a")).Any();

Or

dictionary.Keys.Any(key => key.Contains("a"));

Use Any instead of Where:

dictionary.Keys.Any( key => key.Contains("a"));

You can use the .Any() keyword:

bool exists = dictionary.Keys.Any(key => key.Contains("a"));

If you're asking if you can determine whether or not any key in the dictionary contains "a", then you can do:

dictionary.Keys.Any(key => key.Contains("a"))