(小技巧七)过滤字符替换成*号

被过滤的字符列表可以存在数据库里。文本文件等
此例是放在文本文件中为Filter.txt
内容为
卑鄙|干|抄|超|乳|摸|玩|吻|倒霉|抠|骂|鳖|独|彪|婊|姬|阴|屁|臀|搂

private void FilterText()
        {
            string txtPath=Request.PhysicalApplicationPath+@"modules\guestbookmanager\filter.txt";
            nn=this.TextBox1.Text;
            if(!File.Exists(txtPath))
            {
                Response.Write ("文件路径或者文件路径不存在错误信息");
            }
            else
            {
                StreamReader objReader = new StreamReader(txtPath,System.Text.Encoding.GetEncoding("gb2312"));
                

                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('|');
                    
                    for (int i = 0; i < strArr.Length; i++)
                    {
                        string temp = "";
                        for (int j = 0; j < strArr[i].Length; j++)
                        {temp += "*";}
                        nn=nn.Replace(strArr[i], temp);
                    }
                    Response.Write(nn);
                }
                
            }

过滤xtBox1.Text如果包含有Filter.txt的过滤字符时就替换等长的*号。
需要引用System.IO;命名空间