/// <summary>
        /// 屏蔽非法字符串（如果有出現非法字符,那么用"***"來替換）
        /// </summary>
        /// <param name="strText">要檢測的字符串</param>
        /// <returns>返還一個健康的字符</returns>
        public static string CheckKeyword(string strText)
        {
            IList<string> list = new List<string>();     //實例化一個數據集
            string strpath = System.Web.HttpContext.Current.Server.MapPath("function/keyword.txt");   //獲取文本文檔路徑
            int a =strpath.LastIndexOf("IFSns");   
            int b =strpath.IndexOf("function");
            string m = strpath.Substring(a+5, b - a - 6);
            string PathTxt = strpath.Replace(m, "");    //獲取調用這個方法的相對路徑
            FileStream fs = new FileStream(PathTxt, FileMode.Open, FileAccess.Read);  //打開txt文檔,將數據存到文件流中
            StreamReader reader = new StreamReader(fs, Encoding.Default); //文件讀取
            string strLine = reader.ReadLine();
            while (strLine!=null&&strLine.Length != 0)    //有數據
            {
                list.Add(strLine.Trim().Replace(" ",""));    //如果讀取到的數據有空格,則刪除空格,并且存到string數據集中
                strLine = reader.ReadLine();   //每讀取一次,從該行下一行開始繼續讀取
            }
            fs.Close();  //關閉文件流
            foreach (string str in list)    //循環遍歷文件流
            {
                if (strText.Contains(str))   
                {
                    int lg = str.Length;
                    string sg = "";
                    for (int i = 0; i < lg; i++)
                    {
                        sg+="*";
                    }
                    strText = strText.Replace(str, sg);  //如果含有txt文檔中的關鍵字,則替換為"***"
                }
            }
            return strText;
        }