C# 无法从RestSharp OAuth请求Windows Phone 8.1保存令牌

我正试图通过RestSharp从Trello处获取请求令牌。我只在请求线程中获得了令牌，但无法将其保存在应用程序的变量中。 有一些代码：

    private async void GetToken()
    {

        app.Client.Authenticator = OAuth1Authenticator.ForRequestToken(app.ConsumerKey, app.ConsumerSecret);
        var request = new RestRequest("OAuthGetRequestToken", Method.POST);
        app.Client.ExecuteAsync(request, HandleResponse);

    }

    private void HandleResponse(IRestResponse restResponse)
    {
        var Response = restResponse;
        MessageBox.Show(Response.Content);
        QueryString qs = new QueryString(Response.Content);
        app.OAuthToken = qs["oauth_token"];
        app.OAuthTokenSecret = qs["oauth_token_secret"];
        app.Verifier = qs["verifier"];
        MessageBox.Show(app.OAuthToken);       //got token here, but after
        MessageBox.Show(app.OAuthTokenSecret); //I don`t have anything in this variables
    }

---

您有什么想法吗？

这个问题的解决方案是创建类，使我能够创建同步请求。 此类的代码如下所示：

public static class RestClientExtensions
{
    public static Task<IRestResponse> ExecuteTask(this IRestClient client, RestRequest request)
    {
        var TaskCompletionSource = new TaskCompletionSource<IRestResponse>();
        client.ExecuteAsync(request, (response, asyncHandle) =>
        {
            if (response.ResponseStatus == ResponseStatus.Error)
                TaskCompletionSource.SetException(response.ErrorException);
            else
                TaskCompletionSource.SetResult(response);
        });
        return TaskCompletionSource.Task;
    }
}

以及在方法HandleResponse（响应）之后；执行后，我的应用程序类中有令牌和令牌机密。 我仍然相信一定有更好的办法解决这个问题，但这是我唯一知道的办法

private async void GetToken()
    {

        app.Client.Authenticator = OAuth1Authenticator.ForRequestToken(app.ConsumerKey, app.ConsumerSecret);
        RestRequest request = new RestRequest("OAuthGetRequestToken", Method.POST);
        IRestResponse restResponse = await app.Client.ExecuteTask(request);
        HandleResponse(restResponse);
        GetAccesToken();
    }

    private void HandleResponse(IRestResponse response)
    {
        var Response = response;
        System.Diagnostics.Debug.WriteLine(Response.Content);
        QueryString qs = new QueryString(Response.Content);
        app.OAuthToken = qs["oauth_token"];
        app.OAuthTokenSecret = qs["oauth_token_secret"];
        System.Diagnostics.Debug.WriteLine(app.OAuthToken);
        System.Diagnostics.Debug.WriteLine(app.OAuthTokenSecret);
    }