对不起，问题已经在stackoverflow上，但我没有找到答案。也许它是经典的，但我不明白，如何解决这个问题:(我有使用 Web 服务的 Singletone 类：
public sealed class GYAccessService
{
static GYAccessService instance = null;
static readonly object padlock = new object();
public string Atoken { get; set; }
public string Login { get; set; }
public string Password { get; set; }
public string Uid { get; set; }
const string UrlRequest = "http://site.html";
private GYAccessService()
{
}
public static GYAccessService Instance
{
get
{
lock (padlock)
{
if (instance == null)
{
instance = new GYAccessService();
}
return instance;
}
}
}
public void sendPost(string postData)
{
PostData = "request=" + postData;
HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create(UrlRequest);
webRequest.Method = "POST";
webRequest.ContentType = "application/x-www-form-urlencoded";
webRequest.Accept = "application/json";
webRequest.AllowAutoRedirect = true;
// Start the request
webRequest.BeginGetRequestStream(new AsyncCallback(getRequestStreamCallback), webRequest);
}
private void getRequestStreamCallback(IAsyncResult asynchronousResult)
{
HttpWebRequest webRequest = (HttpWebRequest)asynchronousResult.AsyncState;
// End the stream request operation
Stream postStream = webRequest.EndGetRequestStream(asynchronousResult);
byte[] byteArray = Encoding.UTF8.GetBytes(PostData);
// Add the post data to the web request
postStream.Write(byteArray, 0, byteArray.Length);
postStream.Close();
// Start the web request
webRequest.BeginGetResponse(new AsyncCallback(getResponseCallback), webRequest);
}
private void getResponseCallback(IAsyncResult asynchronousResult)
{
try
{
HttpWebRequest webRequest = (HttpWebRequest)asynchronousResult.AsyncState;
HttpWebResponse response;
// End the get response operation
response = (HttpWebResponse)webRequest.EndGetResponse(asynchronousResult);
Stream streamResponse = response.GetResponseStream();
StreamReader streamReader = new StreamReader(streamResponse);
var Response = streamReader.ReadToEnd();
streamResponse.Close();
streamReader.Close();
response.Close();
using (MemoryStream stream = new MemoryStream(Encoding.Unicode.GetBytes(Response)))
{
DataContractJsonSerializer serializer = new DataContractJsonSerializer(typeof(ServiceResponse));
ServiceResponse res = (ServiceResponse)serializer.ReadObject(stream);
// I want to return res in main thread
}
}
catch (WebException e)
{
// Error treatment
ServiceResponse err = new ServiceResponse();
err.Message = e.Message;
}
}
public string getRequestString(string model, string method, Params parametrs, string auth = null)
{
Function func = new Function();
func.Model = model;
func.Method = method;
func.Params = parametrs;
ServiceRequest req = new ServiceRequest() { Function = func };
string json = JsonConvert.SerializeObject(req);
ServiceResponse deserializedProduct = JsonConvert.DeserializeObject<ServiceResponse>(json);
return json;
}
}
我在主线程中调用了 sendPost()，我想在这个函数中返回响应。
GYAccessService gy = GYAccessService.Instance;
gy.sendPost(postData);
//I want to use the response here
但是在 WP 7 HttpWebRequest 中没有 GetResponse，只有 BeginGetResponse。我使用回调，但不知道如何从回调返回响应。我忍受了，我可以设置属性响应我的 Singletone 并在结束异步回调后获取它，但我不知道如何阻止异步回调。这真的是个问题，我尝试使用 WaitOne()/Set() - 别帮我，我的应用程序刚刚冻结。我尝试使用 IAsyncResult 句柄，但没有成功。如何等待结束工作异步回调？提前致谢！