Count how many times a word appears in an array of words. : String Array « Data Types « C# / C Sharp

Count how many times a word appears in an array of words.


#region Copyright (c) 2004, Ryan Whitaker
' Copyright (c) 2004 Ryan Whitaker
' This software is provided 'as-is', without any express or implied warranty. In no 
' event will the authors be held liable for any damages arising from the use of this 
' software.
' Permission is granted to anyone to use this software for any purpose, including 
' commercial applications, and to alter it and redistribute it freely, subject to the 
' following restrictions:
' 1. The origin of this software must not be misrepresented; you must not claim that 
' you wrote the original software. If you use this software in a product, an 
' acknowledgment (see the following) in the product documentation is required.
' This product uses software written by the developers of NClassifier
' (  NClassifier is a .NET port of the Nick
' Lothian's Java text classification engine, Classifier4J 
' (
' 2. Altered source versions must be plainly marked as such, and must not be 
' misrepresented as being the original software.
' 3. This notice may not be removed or altered from any source distribution.

using System;
using System.Collections;
using System.Text.RegularExpressions;

namespace NClassifier
  public class Utilities

    /// <summary>
    /// Count how many times a word appears in an array of words.
    /// </summary>
    /// <param name="word">The word to count.</param>
    /// <param name="words">A non-null array of words.</param>
    public static int CountWords(string word, string[] words)
      // find the index of one of the items in the array
      int itemIndex = Array.BinarySearch(words, word);

      // iterate backwards until we find the first match
      if (itemIndex > 0)
        while (itemIndex > 0 && words[itemIndex] == word)

      // now itemIndex is one item before the start of the words
      int count = 0;
      while (itemIndex < words.Length && itemIndex >= 0)
        if (words[itemIndex] == word)


        if (itemIndex < words.Length)
          if (words[itemIndex] != word)

      return count;


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