C#使用post方式提交json数据

//地址

string _url = "https://www.dXXXayup.ink/api/User/Login";

//json参数

string jsonParam = "{ phonenumber:\"18665885202\",pwd:\"tsp\"}";

var request = (HttpWebRequest)WebRequest.Create(_url);

request.Method = "POST";

request.ContentType = "application/json;charset=UTF-8";

byte[] byteData = Encoding.UTF8.GetBytes(jsonParam);

int length = byteData.Length;

request.ContentLength = length;

Stream writer = request.GetRequestStream();

writer.Write(byteData, 0, length);

writer.Close();

var response = (HttpWebResponse)request.GetResponse();

var responseString = new StreamReader(response.GetResponseStream(), Encoding.GetEncoding("utf-8")).ReadToEnd();

MessageBox.Show(responseString.ToString());