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)...
String text = "dssdfsfadafdsaf";
var repeatedChars = text.ToCharArray().GroupBy(x => x).Where(y => y.Count() > 1).Select(z=>z.Key);
string theString = "abcdefghab";
//C# query syntax
var qry = (from c in theString.ToCharArray()
group c by c into g
where g.Count() > 1
select g.Key);
//C# pure methods syntax
var qry2 = theString.ToCharArray()
.GroupBy(c => c)
.Where(g => g.Count() > 1)
.Select(g => g.Key);
Also, a string is an IEnumerable already, so you don't really need to call ToCharArray();
var qry = (from c in theString
group c by c into g
where g.Count() > 1
select g.Key);
That leave qry as an IEnumerable, but if you really need a char[], that as easy as qrt.ToArray().
