Question

If I have the following string:

string s = 'abcdefghab'; 

Then how do I get a string (or char[]) that has just the characters that are repeated in the original string using C# and LINQ. In my example I want to end up with ‘ab’.

Although not necessary, I was trying to do this in a single line of LINQ and had so far come up with:

s.ToCharArray().OrderBy(a => a)... 

Answer 1

String text = 'dssdfsfadafdsaf'; var repeatedChars = text.ToCharArray().GroupBy(x => x).Where(y => y.Count() > 1).Select(z=>z.Key);