private void 导入手机号ToolStripMenuItem_Click(object sender, EventArgs e)        {            using (OpenFileDialog Openfile = new OpenFileDialog())            {                Openfile.Filter = "文本文件|*.txt";                Openfile.Multiselect = false;                if (Openfile.ShowDialog() == DialogResult.OK)                {                    Thread threadfile = new Thread(() => ReadFile(Openfile.FileName));                    threadfile.IsBackground = true;                    threadfile.Start();                }            }        }        private void ReadFile(string filename)        {            txtlog.Invoke(new Action(() =>            {                txtlog.AppendText("开始读取手机号码".SetLog());            }));            var file = File.Open(filename, FileMode.Open);            int num = 0;            int goods = 0;            int repeat = 0;            using (var stream = new StreamReader(file))            {                while (!stream.EndOfStream)                {                    lock (lock_send)                    {                        if (sendlist.Count > 99)                        {                            break;                        }                    }                    num++;                    string linetemp = stream.ReadLine().Trim();                    if (IsTel(linetemp))                    {                        lock (lock_send)                        {                            var data = sendlist.Where(m => m.Tel == linetemp).FirstOrDefault();                            if (data != null)                            {                                repeat++;                                continue;                            }                        }                        goods++;                        SendTel _send = new SendTel();                        _send.Tel = linetemp;                        _send.sms_status = status.待发送;                        _send.send_time = null;                        ListViewItem item = new ListViewItem(_send.Tel);                        item.SubItems.Add(_send.sms_status.ToString());                        item.SubItems.Add(_send.send_time);                        item.SubItems.Add("");                        listSend.Invoke(new Action(() =>                        {                            ListViewItem backitem = listSend.Items.Add(item);                            dic.Add(_send.Tel, backitem);                        }));                        lock (lock_send)                        {                            sendlist.Add(_send);                        }                    }                }            }            txtlog.Invoke(new Action(() =>            {                string log = string.Format("添加完成!有效数据为:{0},过滤重复数据:{1},总数据:{2}", goods.ToString(), repeat.ToString(), num.ToString());                txtlog.AppendText(log.SetLog());            }));        }        /// 
        /// 验证手机号是否合法        /// 
        ///         /// 
             public static bool IsTel(string tel)        {            try            {                if (string.IsNullOrEmpty(tel) || tel.Length != 11)                {                    return false;                }                return System.Text.RegularExpressions.Regex.IsMatch(tel, @"^[1]+[3,4,5,6,7,8]+\d{9}");            }            catch (Exception ex)            {                return false;            }        }

 

很久以前写的代码了，读取txt文件，一行一个手机号码，

好像要求txt文本文件必须是utf8格式，否则读取出来会乱码。