C#敏感关键词过滤代码

System.Text.StringBuilder sb = new System.Text.StringBuilder(text.Length);

            string filterText = "需要过滤的脏字 以|分开";//脏字 可根据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这个key

                {

                    int num = 0;//是否找到匹配的关键字  1找到0未找到

                    var data = dicList[word].OrderBy(g => g.Length);//把该key的字典集合按 字符数排序(方便下面从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总长度 则执行截取

                        {

                            string result = text.Substring(i, wordbook.Length);//根据关键字长度往后截取相同的字符数进行比较

                            if (result == wordbook)

                            {

                                num = 1;

                                sb.Append(GetString(result));

                                i = i + wordbook.Length - 1;//比较成功 同时改变i的索引

                                break;

                            }

                        }

                    }

                    if (num == 0)

                        sb.Append(word);

                }

                else

                    sb.Append(word);

            }

            return sb.ToString();

        }

        /// <summary>

        /// 替换星号

        /// </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;

        }

//该代码片段来自于: http://www.sharejs.com/codes/csharp/5486