Removing characters from strings with LINQ

Question

I\'m trying to brush up on my LINQ by writing some simple extension methods. Is there any better way to write such a function as below that removes a given list of character

Answer 1

You get a little performance increase when using a stringBuilder instead of the new string. Below results in:

StringBuilder 00:00:13.9930633 new String 00:00:15.1495309

        string s = "ababababajjjaazsiajjsoajiojsioajlmmzaaokpdahgffaiojsia";
        var sw = new Stopwatch();
        sw.Start();
        var toRemove = new char[] { 'j', 'a', 'z' };
        for (int i = 0; i < 1000000; i++)
        {
            StringBuilder sb = new StringBuilder(s.Length, s.Length);
            foreach (var c in s) if (!toRemove.Contains(c)) sb.Append(c);
        }
        Console.WriteLine("StringBuilder " + sw.Elapsed);
        sw.Restart();
        for (int i = 0; i < 1000000; i++)
        {
            new string(s.Where(c => !toRemove.Contains(c)).ToArray());
        }
        Console.WriteLine("new String " + sw.Elapsed);