C# c、 Xamarin:执行webRequest.GetResponse（）失败

我创建了一个类SoapClient，它创建了发送简单get和post请求的基本功能。但是，输出仅产生“bingo”和“System.Net.WebAsyncResult”，并且在SoapCLient的showDef函数中不继续。有什么问题吗？提前感谢…：

SoapClient类

查找活动

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考虑从HtpWebRebug迁移到HTTPclipse。你在这里找到一个例子：很多人和XAMARIN一起遇到了HTTPWebRebug的问题。看看XAMARIN网站的例子——考虑从HTTPWebRebug到HTTPclipse。您可以在这里找到一个例子：许多人在HttpWebRequest与Xamarin的结合方面存在问题-

using System;
using System.Xml;
using System.Net;
using System.IO;
using Android.OS;
namespace Dictionaryv3
{
    public class SoapClient
    {

        private HttpWebRequest webRequest;
        private Handler Dispatcher;

        public delegate void soapDelegate (XmlDocument x);
        public event soapDelegate responseReady;

        public SoapClient() {}



        public void SendGetRequest(String url, String action, string key, string value) {
            Dispatcher = new Handler ();
            url += "/" + action+ "?";

            if (key != null) {
                url+= key+"=" + value;
            }

            webRequest = CreateGetWebRequest(url);
            webRequest.BeginGetResponse(new AsyncCallback (responseReceived), null);
        }

        private void responseReceived(IAsyncResult res) {
            Console.WriteLine ("bingo");
            Console.WriteLine (res.ToString ());
            var result = webRequest.EndGetResponse (res);

            Console.Write("received");
            Console.Write(result.ToString()); 

            Dispatcher.Post (() => {

                Stream responseStream = result.GetResponseStream();
                StreamReader sr = new StreamReader(result.GetResponseStream());
                string xml = sr.ReadToEnd();
                XmlDocument doc = new XmlDocument();
                doc.LoadXml(xml);
                if(responseReady != null) {
                    responseReady(doc);
                }


            });
        }

        public void SendPostRequest(String url, XmlDocument envelop) {
            Dispatcher = new Handler ();
            webRequest = CreatePostWebRequest(url);
            InsertSoapEnvelopeIntoWebRequest(envelop, webRequest);
            IAsyncResult asyncResult = webRequest.BeginGetResponse(responseReceived, null);
        }

        private void InsertSoapEnvelopeIntoWebRequest(XmlDocument soapEnvelopeXml, HttpWebRequest webRequest)
        {
            using (Stream stream = webRequest.GetRequestStream())
            {
                soapEnvelopeXml.Save(stream);
            }
        }

        private HttpWebRequest CreateGetWebRequest(string url)
        {
            HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create(url);
            webRequest.ContentType = "text/xml;charset=\"utf-8\"";
            webRequest.Accept = "text/xml";
            webRequest.Method = "GET";
            return webRequest;
        }

        private HttpWebRequest CreatePostWebRequest(String url) {
            HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create(url);
            webRequest.ContentType = "text/xml;charset=\"utf-8\"";
            webRequest.Accept = "text/xml";
            webRequest.Method = "POST";
            return webRequest;
        }

    }
}

using System;

using Android.App;
using Android.Content;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using Android.OS;
using System.Xml;
using System.Collections.ObjectModel;
using System.Collections.Generic;
namespace Dictionaryv3
{
    [Activity (Label = "Dictionary", MainLauncher = true, Icon = "@drawable/icon")]
    public class LookUpActivity : Activity
    {

        private Button LookUp;
        private EditText Input;
        private ListView WordView;
        private List<Word> Words = new List<Word>();
        private Button Menu;
        private SoapClient client;


        protected override void OnCreate (Bundle bundle)
        {
            base.OnCreate (bundle);
            SetContentView( Resource.Layout.Main);

            LookUp = ( Button ) FindViewById ( Resource.Id.lookup);
            Input = (EditText)FindViewById (Resource.Id.input);
            WordView = (ListView)FindViewById (Resource.Id.words);
            Menu = (Button)FindViewById (Resource.Id.menu);
            client = new SoapClient ();
            client.responseReady += showDef;

            Menu.Click += (object sender, EventArgs e) => {
                PopupMenu menu = new PopupMenu (this, Menu);

                menu.Inflate (Resource.Menu.popup_menu);
                menu.Show ();

                menu.MenuItemClick += (object send, PopupMenu.MenuItemClickEventArgs args) => {
                    string title = args.Item.TitleFormatted.ToString();
                    if(title == "Select dictionaries") {
                        setDictionaryActivity();
                    }
                };

            };

            LookUp.Click += ( sender, eventArgs) => LookUpWord ();




        }

        private void setDictionaryActivity() {

            var intent = new Intent(this, typeof(DictionarySelectionActivity));
            StartActivity(intent);

        }



        private void LookUpWord() {

            String inp = Input.Text;
            if( inp != "") {
                client.SendGetRequest("http://services.aonaware.com/DictService/DictService.asmx", "Define", "word", inp);
            }
        }

        public void showDef(XmlDocument doc) {
            Words.Clear();
            XmlNodeList dlist = doc.GetElementsByTagName("Definition");
            for(int i=0;i!=dlist.Count;i++) {
                Word w = new Word();
                w.dictionary = dlist.Item(i).ChildNodes.Item(1).LastChild.InnerText;
                w.description = dlist.Item(i).ChildNodes.Item(2).InnerText;
                Words.Add(w);
            }

            WordView.Adapter = new WordAdapter(this, Words);
        }

        protected override void OnPause() {
            base.OnPause ();
        }

        protected override void OnResume() {
            LookUpWord ();
            base.OnResume ();
        }


    }
}