public void HandleTxt()        {            try            {                using (FileStream Du = new FileStream(TxtPath.Text, FileMode.Open))                {                    string P = TxtPath.Text; //源文件名*.log                    string Name = P.Substring(P.Length - 14);   //原文件名                    string Pa = P.Remove(P.Length - 14) + Name.Replace("log", "txt");   //新建同名txt                    if (File.Exists(Pa))                    {                        MessageBox.Show("存在同名后缀为txt的文件，请删除" + Name.Replace("log", "txt"));                        return;                    }                    FileStream Xie = new FileStream(Pa, FileMode.Create);   //新建                    StreamReader sr = new StreamReader(Du, Encoding.Default); //读取                    StreamWriter Wri = new StreamWriter(Xie, Encoding.Default);//写入                    while (!sr.EndOfStream)                    {                        string sline = sr.ReadLine();                        if (sline.IndexOf("合法刷卡") >= 0)                        {                            string[] u = sline.Split('(');                            Wri.WriteLine(u[2].Replace(")", ""));                        }                    }                }            }            catch (Exception ex)            {                MessageBox.Show("异常！" + ex.Message);            }        }