C# 添加敏感词

       public class CheckStreamReader
	{
        //使用的数据：
        private static HashSet<string> hash = new HashSet<string>();
        private byte[] fastCheck = new byte[char.MaxValue];
        private BitArray charCheck = new BitArray(char.MaxValue);
        private int maxWordLength = 0;
        private int minWordLength = int.MaxValue;
        private static string[] badwords = { };

        public CheckStreamReader()
        {
            if (hash == null || hash.Count <= 0)
            {
                //添加敏感词
                string path = HttpContext.Current.Server.MapPath("~/config") + "/StreamReader.txt";
                StreamReader sr = new StreamReader(path, Encoding.GetEncoding("utf-8"));
                string strText = sr.ReadToEnd();
                badwords = strText.Split('|');
                InitializationText();
            }
        }

        //初始化数据的代码：将敏感词加入的hash表中
        private void InitializationText()
        {
            foreach (string word in badwords)
            {
                maxWordLength = Math.Max(maxWordLength, word.Length);
                minWordLength = Math.Min(minWordLength, word.Length);

                for (int i = 0; i < 7 && i < word.Length; i++)
                {
                    fastCheck[word[i]] |= (byte)(1 << i);
                }

                for (int i = 7; i < word.Length; i++)
                {
                    fastCheck[word[i]] |= 0x80;
                }

                if (word.Length == 1)
                {
                    charCheck[word[0]] = true;
                }
                else
                {
                    hash.Add(word);
                }
            }
        }

        //判断是否包含脏字的代码：
        public bool HasBadWord(string text)
        {
            if (hash == null || hash.Count<=0)
            {
                string path = HttpContext.Current.Server.MapPath("~/" + ConfigurationManager.AppSettings["ConfigPath"]) + "/StreamReader.txt";
                StreamReader sr = new StreamReader(path, Encoding.GetEncoding("utf-8"));
                string strText = sr.ReadToEnd();
                badwords = strText.Split('|');
                InitializationText();
            }

            int index = 0;

            while (index < text.Length)
            {
                if ((fastCheck[text[index]] & 1) == 0)
                {
                    while (index < text.Length - 1 && (fastCheck[text[++index]] & 1) == 0) ;
                }

                if (minWordLength == 1 && charCheck[text[index]])
                {
                    return true;
                }

                for (int j = 1; j <= Math.Min(maxWordLength, text.Length - index - 1); j++)
                {
                    if ((fastCheck[text[index + j]] & (1 << Math.Min(j, 7))) == 0)
                    {
                        break;
                    }

                    if (j + 1 >= minWordLength)
                    {
                        string sub = text.Substring(index, j + 1);

                        if (hash.Contains(sub))
                        {
                            return true;
                        }
                    }
                }

                index++;
            }

            return false;
        }
	}