这是我的代码:
namespace RequestApi
{
public partial class MainPage : PhoneApplicationPage
{
private BackgroundWorker bw;
private string ans;
private JObject ansJson;
private static ManualResetEvent allDone = new ManualResetEvent(false);
// Constructor
public MainPage()
{
InitializeComponent();
}
private void button1_Click(object sender, RoutedEventArgs e)
{
string url = "http://192.168.0.43:8182/Account/SignIn";
CreateRequest(url);
userId.Text = ansJson.Value<int>("user_id").ToString();
}
private void CreateRequest(string url)
{
Debug.WriteLine("CreateRequest");
HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(url);
req.ContentType = "application/json";
req.Method = "POST";
req.BeginGetRequestStream(new AsyncCallback(RequestCallback), req);
allDone.WaitOne();
}
private void RequestCallback(IAsyncResult aresult)
{
Debug.WriteLine("RequestCallback");
HttpWebRequest req = (HttpWebRequest)aresult.AsyncState;
Stream postStream = req.EndGetRequestStream(aresult);
string obj = "{ 'username': 'test_2@aragast.com', 'password': 'a123456' }";
JObject json = JObject.Parse(obj);
string s = JsonConvert.SerializeObject(json);
byte[] postdata = System.Text.Encoding.Unicode.GetBytes(s);
postStream.Write(postdata, 0, postdata.Length);
postStream.Close();
req.BeginGetResponse(new AsyncCallback(ResponseCallback), req);
}
private void ResponseCallback(IAsyncResult aresult)
{
Debug.WriteLine("ResponseCallback");
HttpWebRequest req = (HttpWebRequest)aresult.AsyncState;
HttpWebResponse resp = (HttpWebResponse)req.EndGetResponse(aresult);
StreamReader reader = new StreamReader(resp.GetResponseStream());
string response = reader.ReadToEnd();
Debug.WriteLine(response);
JObject responseJson = JObject.Parse(response);
ansJson = responseJson;
Debug.WriteLine("ansJson from responseCallback {0}", ansJson);
reader.Close();
resp.Close();
allDone.Set();
}
}
}
当我调试应用程序时,它输入了 CreateRequest,然后输入了 RequestCallback,但随后它停止并且从不输入 ResponseCallback,而是尝试使用 userId.Text 分配 asnJson 值为 null,因为它没有输入 ResponseCallback。当我做错时,为什么它永远不会进入ResponseCallback?