System.Text.StringBuilder sb = new System.Text.StringBuilder(text.Length); string filterText = "需要過濾的臟字 以|分開"; //臟字 可根據自己的方式用分隔符 string[] filterData = filterText.Split('|'); foreach (var item in filterData) {  char value = item[0];  if (dicList.ContainsKey(value))   dicList[value].Add(item);  else   dicList.Add(value, new List<string>() { item }); } int count = text.Length; for (int i = 0; i < count; i++) {  char word = text[i];  if (dicList.ContainsKey(word))//如果在字典表中存在這個key  {   int num = 0;//是否找到匹配的關鍵字 1找到0未找到   var data = dicList[word].OrderBy(g => g.Length);   //把該key的字典集合按 字符數排序(方便下面從少往多截取字符串查找)   foreach (var wordbook in data)   {    if (i + wordbook.Length <= count)    //如果需截取的字符串的索引小于總長度 則執行截取    {     string result = text.Substring(i, wordbook.Length);     //根據關鍵字長度往后截取相同的字符數進行比較     if (result == wordbook)     {      num = 1;      sb.Append(GetString(result));      i = i + wordbook.Length - 1;      //比較成功 同時改變i的索引      break;     }    }   }   if (num == 0)    sb.Append(word);  }  else   sb.Append(word); } return sb.ToString();}/// <summary>/// 替換星號/// </summary>/// <param name="value"></param>/// <returns></returns>private static string GetString(string value){ string starNum = string.Empty; for (int i = 0; i < value.Length; i++) {  starNum += "*"; } return starNum;}