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我有一個Windows Phone 8應用程序，我在呼叫等待HttpClient.PostAsync，它永遠不會返回結果。它只是坐在那裏，掛起。如果我從控制檯應用程序運行完全相同的代碼，它幾乎立即返回結果。所有做這項工作的代碼都駐留在一個可移植的類庫中。我將不勝感激您的任何幫助。我發現在這個狀態下使用的所有其他問題都等待client.PostAsync，我已經在這樣做。WP8 HttpClient.PostAsync永遠不會返回結果
在我的類庫的代碼是這樣的：
public class Authenticator
{
private const string ApiBaseUrl = "http://api.fitbit.com";
private const string Callback = "http://myCallbackUrlHere";
private const string SignatureMethod = "HMAC-SHA1";
private const string OauthVersion = "1.0";
private const string ConsumerKey = "myConsumerKey";
private const string ConsumerSecret = "myConsumerSecret";
private const string RequestTokenUrl = "http://api.fitbit.com/oauth/request_token";
private const string AccessTokenUrl = "http://api.fitbit.com/oauth/access_token";
private const string AuthorizeUrl = "http://www.fitbit.com/oauth/authorize";
private string requestToken;
private string requestTokenSecret;
public string GetAuthUrlToken()
{
return GenerateAuthUrlToken().Result;
}
private async Task<string> GenerateAuthUrlToken()
{
var httpClient = new HttpClient { BaseAddress = new Uri(ApiBaseUrl) };
var timeSpan = DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0);
var oauthTimestamp = Convert.ToInt64(timeSpan.TotalSeconds).ToString(CultureInfo.InvariantCulture);
var oauthNonce = DateTime.Now.Ticks.ToString(CultureInfo.InvariantCulture);
var authHeaderValue = string.Format(
"oauth_callback=\"{0}\",oauth_consumer_key=\"{1}\",oauth_nonce=\"{2}\"," +
"oauth_signature=\"{3}\",oauth_signature_method=\"{4}\"," +
"oauth_timestamp=\"{5}\",oauth_version=\"{6}\"",
Uri.EscapeDataString(Callback),
Uri.EscapeDataString(ConsumerKey),
Uri.EscapeDataString(oauthNonce),
Uri.EscapeDataString(this.CreateSignature(RequestTokenUrl, oauthNonce, oauthTimestamp, Callback)),
Uri.EscapeDataString(SignatureMethod),
Uri.EscapeDataString(oauthTimestamp),
Uri.EscapeDataString(OauthVersion));
httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue(
"OAuth",
authHeaderValue);
var content = new StringContent(string.Empty);
var response = await httpClient.PostAsync(RequestTokenUrl, content);
if (response.StatusCode != HttpStatusCode.OK)
{
throw new Exception("Request Token Step Failed");
}
var responseContent = await response.Content.ReadAsStringAsync();
var responseItems = responseContent.Split(new[] { '&' });
this.requestToken = responseItems[0];
this.requestTokenSecret = responseItems[1];
var url = string.Format("{0}?{1}&display=touch", AuthorizeUrl, this.requestToken);
return url;
}
public string CreateSignature(string url, string nonce, string timestamp, string callback)
{
// code removed
return signatureString;
}
private static byte[] StringToAscii(string s)
{
// code removed
return retval;
}
}
我有一個調用這個庫中的控制檯應用程序，並將它與沒有問題的作品：
public class Program
{
public static void Main(string[] args)
{
var o = new Program();
o.LinkToFitbit();
}
public void LinkToFitbit()
{
var authenticator = new Authenticator();
// this works and returns the url immediately
var url = authenticator.GetAuthUrlToken();
// code removed
}
}
當我從我的WP8運行應用程序，它只是當它到達庫中的此行時掛起：
var response = await httpClient.PostAsync(RequestTokenUrl, content);
這是我的WP8代碼：
public partial class FitbitConnector : PhoneApplicationPage
{
public FitbitConnector()
{
InitializeComponent();
this.AuthenticateUser();
}
private void AuthenticateUser()
{
var authenticator = new Authenticator();
var url = authenticator.GetAuthUrlToken();
// code removed
}
}
非常感謝！就是這樣。我在異步/等待方面還是比較新的。 –