/// <summary>         /// 屏蔽非法字符串（如果有出现非法字符,那么用"***"来替换）         /// </summary>         /// <param name="strText">要检测的字符串</param>         /// <returns>返还一个健康的字符</returns>         public static string CheckKeyword(string strText)         {             IList<string> list = new List<string>();     //实例化一个数据集             string strpath = System.Web.HttpContext.Current.Server.MapPath("function/keyword.txt");   //获取文本文档路径             int a =strpath.LastIndexOf("IFSns");                int b =strpath.IndexOf("function");             string m = strpath.Substring(a+5, b - a - 6);             string PathTxt = strpath.Replace(m, "");    //获取调用这个方法的相对路径             FileStream fs = new FileStream(PathTxt, FileMode.Open, FileAccess.Read);  //打开txt文档,将数据存到文件流中             StreamReader reader = new StreamReader(fs, Encoding.Default); //文件读取             string strLine = reader.ReadLine();             while (strLine!=null&&strLine.Length != 0)    //有数据             {                 list.Add(strLine.Trim().Replace(" ",""));    //如果读取到的数据有空格,则删除空格,并且存到string数据集中                 strLine = reader.ReadLine();   //每读取一次,从该行下一行开始继续读取             }             fs.Close();  //关闭文件流             foreach (string str in list)    //循环遍历文件流             {                 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文档中的关键字,则替换为"***"                 }             }             return strText;         }