过滤非法字符（脏字）的类

using  System;
using  System.Collections.Generic;
using  System.Linq;
using  System.Text;
using  System.IO;
using  System.Web;
using  System.Collections;

namespace   ****** .WebHelper
{
     public   class  FilterText
    {
         string  FilePath  =   string .Empty;
         public  FilterText()
        {
            FilePath  =  HttpContext.Current.Server.MapPath( " ~/Config/ValidDict.txt " );//脏字文件的路径
        }
         ///   <summary>
         ///  读文件的内容
         ///   </summary>
         ///   <param name="url"> 物理路径 </param>
         ///   <returns></returns>
         public   string  ReadFilterText()
        {
            FileStream fsReadDefaultTemplate  =   new  FileStream(FilePath, FileMode.Open, FileAccess.Read);
            StreamReader srReadDefaultTemplate  =   new  StreamReader(fsReadDefaultTemplate, System.Text.Encoding.UTF8);
             string  content  =  srReadDefaultTemplate.ReadToEnd();
            fsReadDefaultTemplate.Close();
            srReadDefaultTemplate.Close();
             return  content;
        }

         ///   <summary>
         ///  写非法关键字到文件
         ///   </summary>
         ///   <param name="url"> 物理路径 </param>
         ///   <param name="content"> 内容 </param>
         ///   <returns></returns>
         public   void  WriteFilterText( string  content)
        {
            FileStream fs  =   new  FileStream(FilePath, FileMode.Create, FileAccess.Write);
            StreamWriter sw  =   new  StreamWriter(fs, System.Text.Encoding.UTF8);            
            sw.Write(content);
            sw.Close();
            fs.Close();
        }
         ///   <summary>
         ///  过滤非法字符,替换为*号
         ///   </summary>
         ///   <param name="TempStr"> 需要过滤的字符串 </param>
         ///   <returns></returns>
         public   string  FilterInfo( string  TempStr)
        {
             if  (File.Exists(FilePath))
            {
                StreamReader objReader  =   new  StreamReader(FilePath, System.Text.Encoding.UTF8);
                 string  sLine  =   "" ;
                ArrayList arrText  =   new  ArrayList();
                 while  (sLine  !=   null )
                {
                    sLine  =  objReader.ReadLine();
                     if  (sLine  !=   null )
                        arrText.Add(sLine);
                }
                objReader.Close();
                 foreach  ( string  sOutput  in  arrText)
                {
                     string [] strArr  =  sOutput.Split( new   char [] { ( char ) 10 , ( char ) 13  }, StringSplitOptions.RemoveEmptyEntries);

                     for  ( int  i  =   0 ; i  <  strArr.Length; i ++ )
                    {
                         string  temp  =   "" ;
                         for  ( int  j  =   0 ; j  <  strArr[i].Length; j ++ )
                        { temp  +=   " * " ; }
                        TempStr  =  TempStr.Replace(strArr[i], temp);
                    }
                }
            }
             return  TempStr;
        }
    }
}