C#统计英文文本中的单词数并排序

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1	思路如下：<br>1.使用的Hashtable（高效）集合，记录每个单词出现的次数<br>2.采用ArrayList对Hashtable中的Keys按字母序排列<br>3.排序使用插入排序（稳定）

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public void StatisticsWords(string path)         {             if (!File.Exists(path))             {                 Console.WriteLine("文件不存在！");                 return;             }             Hashtable ht = new Hashtable(StringComparer.OrdinalIgnoreCase);             StreamReader sr = new StreamReader(path, System.Text.Encoding.UTF8);             string line = sr.ReadLine();               string[] wordArr = null;             int num = 0;             while (line.Length > 0)             {                 //   MatchCollection mc =  Regex.Matches(line, @"\b[a-z]+", RegexOptions.Compiled | RegexOptions.IgnoreCase);                 //foreach (Match m in mc)                 //{                 //    if (ht.ContainsKey(m.Value))                 //    {                 //        num = Convert.ToInt32(ht[m.Value]) + 1;                 //        ht[m.Value] = num;                 //    }                 //    else                 //    {                 //        ht.Add(m.Value, 1);                 //    }                 //}                 //line = sr.ReadLine();                   wordArr = line.Split(' ');                 foreach (string s in wordArr)                 {                     if (s.Length == 0)                         continue;                     //去除标点                     line = Regex.Replace(line, @"[\p{P}*]", "", RegexOptions.Compiled);                     //将单词加入哈希表                     if (ht.ContainsKey(s))                     {                         num = Convert.ToInt32(ht[s]) + 1;                         ht[s] = num;                     }                     else                     {                         ht.Add(s, 1);                     }                 }                 line = sr.ReadLine();             }               ArrayList keysList = new ArrayList(ht.Keys);             //对Hashtable中的Keys按字母序排列             keysList.Sort();             //按次数进行插入排序【稳定排序】，所以相同次数的单词依旧是字母序             string tmp = String.Empty;             int valueTmp = 0;             for (int i = 1; i < keysList.Count; i++)             {                 tmp = keysList[i].ToString();                 valueTmp = (int)ht[keysList[i]];//次数                 int j = i;                 while (j > 0 && valueTmp > (int)ht[keysList[j - 1]])                 {                     keysList[j] = keysList[j - 1];                     j--;                 }                 keysList[j] = tmp;//j=0             }             //打印出来             foreach (object item in keysList)             {                 Console.WriteLine((string)item + ":" + (string)ht[item]);             }         }