如何将对象从android webview传递到c＃以加载html页面

 WebView web_view = root.FindViewById<WebView>(Resource.Id.IVChartsViews); 

 String API = "https://Test.com/Sample/MobileApp?Userdetails=" + str + "&id=" + -9999;

 string obj1 = JsonConvert.SerializeObject(GlobalParams.ivs);
         HttpContent content = new StringContent(obj1.ToString());
         content.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue("application/json");
         web_view.PostUrl(API, content.ReadAsByteArrayAsync().Result);
 WebView web_view = root.FindViewById<WebView>(