为什么下面的代码只能下载一行数据？

 private async void 下载保存测试股票数据文件(string stockCode)
{
//设定下载时间段
DateTime endDate = DateTime.Now;
DateTime startDate = endDate.AddDays(-30);

string filePathName = "C:\\TEMP\\" + stockCode + ".csv";
string uri = string.Format("http://quotes.money.163.com/service/chddata.html?code={0}&start={1}&end={2}&fields=TCLOSE;HIGH;LOW;TOPEN;TURNOVER;VOTURNOVER", stockCode, startDate.ToString("yyyyMMdd"), endDate.ToString("yyyyMMdd"));
HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(uri);
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
Stream responseStream = response.GetResponseStream();

using (StreamReader srWeb = new StreamReader(responseStream, Encoding.GetEncoding("gb2312")))
{
  string text = await srWeb.ReadToEndAsync();
    //或者取消异步直接string text = srWeb.ReadToEnd();
    //或者循环读取一行While(text = srWeb.ReadLine() != null)

    Console.WriteLine(text);
}


}

//即使使用ReadLine()，第一次有一行数据，第二次读行就为空了，啥道理啊？困住了，大家能否救救我，跪谢！

//用uri的实际字符串手动在浏览器里能直接下载到完整的多行数据，比如：
http://quotes.money.163.com/service/chddata.html?code=0601336&start=20160616&end=20160716&fields=TCLOSE;HIGH;LOW;TOPEN;TURNOVER;VOTURNOVER

找到问题答案了，问题出在这句：

 string uri = string.Format("http://quotes.money.163.com/service/chddata.html?code={0}&start={1}&end={2}&fields=TCLOSE;HIGH;LOW;TOPEN;TURNOVER;VOTURNOVER", stockCode, startDate.ToString("yyyyMMdd"), endDate.ToString("yyyyMMdd"));

把code={0}改为code=0{0}即可，原来对网址规则没分析清楚。

用fiddler调试下看看

string text = await srWeb.ReadToEndAsync();

得到的应该就是整个文件变成的String，如果想获得List< String >的话，试试
```var fileText = await reader.ReadToEndAsync();return fileText.Split(new[] { Environment.NewLine }, StringSplitOptions.None);

出处：[http://stackoverflow.com/questions/13167934/how-to-async-files-readalllines-and-await-for-results](http://stackoverflow.com/questions/13167934/how-to-async-files-readalllines-and-await-for-results "")

估计是和异步读写有关吧

 using (StreamReader srWeb = new StreamReader(responseStream, Encoding.GetEncoding("gb2312")))
{
   String line;
                while ((line = srWeb.ReadLine()) != null) 
                {
                    sw.WriteLine(line);
                }
}