Word Count Algorithm in C#

Question

I am looking for a good word count class or function. When I copy and paste something from the internet and compare it with my custom word count algorithm and MS Word it is

Answer 1

I've just had the same problem in ClipFlair, where I needed to calculate WPM (Words-per-minute) for Movie Captions, so I came up with the following one:

You can define this static extension method in a static class and then add a using clause to the namespace of that static class at any class that needs to use this extension method. The extension method is invoked using s.WordCount(), where s is a string (an identifier [variable/constant] or literal)

public static int WordCount(this string s)
{
  int last = s.Length-1;

  int count = 0;
  for (int i = 0; i <= last; i++)
  {
    if ( char.IsLetterOrDigit(s[i]) &&
         ((i==last) || char.IsWhiteSpace(s[i+1]) || char.IsPunctuation(s[i+1])) )
      count++;
  }
  return count;
}