如何在xamarin.android中发送PUT请求？

Question

[我正在尝试从xamarin.android应用程序中单击按钮以使用以下代码更新数据库中的记录时发送PUT请求：

我尝试使用邮递员发送此json数据，并且有效：

{'status': 'On'}

但是当我尝试在我的xamarin.android应用程序中发送它时，它不起作用。

错误：远程服务器返回错误（500）内部服务器错误

功能：

        private async void SendAPIRequest(string method, string jsonrequest)
        {
            HttpWebRequest request = new HttpWebRequest(new Uri(String.Format("http://192.168.0.179:8080/api/devices/update/1")));//address of request
            request.Method = "PUT";

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

            using (var streamWriter = new StreamWriter(request.GetRequestStream()))
            {
                streamWriter.Write(jsonrequest);
                streamWriter.Flush();
            }

            HttpWebResponse httpResponse = (HttpWebResponse)(await request.GetResponseAsync());
            string json;
            using (Stream responseStream = httpResponse.GetResponseStream())
            {
                json = new StreamReader(responseStream).ReadToEnd();//read the Json and assign it to a variable
            }
        }

按钮单击

        private void BtnRequest_Click(object sender, EventArgs e)
        {
            string request = @"{'status': 'On'}";
            SendAPIRequest("PUT", request);
        }

PS：这只是一个测试API，因此不需要身份验证。

Answer 1

try
{
    HttpWebRequest req = WebRequest.Create(url) as HttpWebRequest;

    WebResponse wr = req.GetResponse();
}
catch (WebException wex)
{
    var pageContent = new StreamReader(wex.Response.GetResponseStream())
                          .ReadToEnd();
}