附加字符串的最简单方法是什么？

Question

Say I have a function List<string> list with content {"a","b","c","d"}

is it possible to have a return statement like

return list union {"d"} //Which is essentially {"a","b","c","d","d"}

if yes what is the syntax?

Answer 1

Yes:

return list.Concat(new[] {"d"}).ToList();

This statement does not alter contents of list . The Concat method, is an extension method provided by LINQ, so make sure you have the following using statement on top of your file:

using System.Linq;