读取url接口数据

string url = "http://localhost:8180/city-smscenter/smscenter?cmd=flowsms.queryMobileSmsList&mobile=" + channel1
+ "&startdate=2015-01-18%2016:50:34.015677&enddate=2020-01-20%2000:00:00";

public string jsonData(string url)
{
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
Stream ResStream = response.GetResponseStream();
Encoding encoding = Encoding.GetEncoding("UTF-8");
StreamReader streamReader = new StreamReader(ResStream, encoding);
//WebMessageBox.Show(streamReader.ReadToEnd());
string str = streamReader.ReadToEnd();
DataTable dt = JsonToDataTable(str);
return Newtonsoft.Json.JsonConvert.SerializeObject(dt);
}