Question

I’m looking to know when a string does not contain two strings. For example.

string firstString = "pineapple"
string secondString = "mango"

string compareString = "The wheels on the bus go round and round"

So, I want to know when the first string and second string are not in the compareString.

How?

Answer 1

You should put all your words into some kind of Collection or List and then call it like this:

var searchFor = new List<string>();
searchFor.Add("pineapple");
searchFor.Add("mango");

bool containsAnySearchString = searchFor.Any(word => compareString.Contains(word));

If you need to make a case or culture independent search you should call it like this:

bool containsAnySearchString = 
   searchFor.Any(word => compareString.IndexOf
     (word, StringComparison.InvariantCultureIgnoreCase >= 0);