从单词序列中返回不同的元素

Question

supposing I have a List with some words like this:

List<string> words = new List<string>{ "apple", "computer", "user", "AppLe", "USer", "photo", "USER" };

and I want to produce a new list like this:

List<string> newWords = new List<string>{ "apple", "computer", "user", "photo" };

How can I clean the first list from all the multiple words (no matter how they are written)?

many thanks in advance, Filippo

Answer 1

Like this:

List<string> newWords = words.Distinct(StringComparer.OrdinalIgnoreCase).ToList();

This way you don't change any words in the resulting list (eg making them lowercase).

You can also use: StringComparer.CurrentCultureIgnoreCase or StringComparer.InvariantCultureIgnoreCase , depending on your culture requirements.

Answer 2

List<string> words = new List<string> { "apple", "computer", "user", "AppLe", "USer", "photo", "USER" };
words = words.Select(x => x.ToLower()).Distinct().ToList();