A clever alternative in LINQ for iterating over HashSet<string>
c#, hashset, linq
Solution
bool validUrl = whiteList.Any(item => linkUrl.StartsWith(item));
By the way, in general, hash tables are not good data structures for these kind of problems (where you don't have the key and are matching the key based on a function) as you'll have to enumerate the whole table all the time. You can use a simple `List<string>` to hold the items instead and you'll get better performance.
Problem
I've got a whitelist of URLs I'm using, inside a `HashSet<string>`. I'm trying to find if the `url` starts with any of the items in the white list (it has to be that way round). Edit: The previous example was a bit misleading and had a typo - I already have a base url like yahoo.com, the whitelist is just the path. ``` HashSet<string> whiteList = new HashSet<string>(); string path = "/sport/baseball/"; bool validUrl = false; foreach (string item in whiteList) { if (path.StartsWith(item)) { validUrl = true; break; } } ``` Is there a more elegant way of doing this lookup with LINQ (to objects)? The list isn't huge so performance isn't an issue.