如何在 Windows Phone 8 中为 RestClient 设置超时

我正在使用RestSharp API调用Web服务。但是我面临着一个问题，在这种情况下，当服务器花费的时间超过RestClient的默认超时（即100秒）时，我总是得到StatusCode=NotFound。我还尝试对超时和读写超时参数值进行硬编码，但没有帮助。有人可以建议在这里做什么吗？

我的代码如下

public async Task<WebDownloadResult> SyncMobileData(string encryptedstring)
    {
        WebDownloadResult response = new WebDownloadResult();
        var client = new RestClient(BaseUrl + Constants.WEB_SERVICE_NAME);
        client.Timeout = CONN_TIMEOUT;
        client.ReadWriteTimeout = CONN_TIMEOUT;
        var request = new RestRequest(Method.POST);
        byte[] encryptedbytes=System.Text.Encoding.UTF8.GetBytes(encryptedstring);
        request.AddParameter("", encryptedbytes, ParameterType.RequestBody);
        try
        {
            response = await client.GetResponseBytesAsync(request);
        }
        catch (Exception outer)
        {
            response.ErrorOccured = true;
            response.ErrorMessage = outer.Message;
        }
        return response;
    }

其中 CONN_TIMEOUT=600000，我的响应处理类如下：

public static class RestClientExtensions
{
    private static Task<T> GetResponseFromServer<T>(this RestClient client, IRestRequest request, Func<WebDownloadResult, T> selector)
    {
        var tcs = new TaskCompletionSource<T>();
        WebDownloadResult webResponse = new WebDownloadResult();
        var loginResponse = client.ExecuteAsync(request, r =>
        {
            if (r.ErrorException == null && r.StatusCode == HttpStatusCode.OK)
            {
                webResponse.StatusCode = r.StatusCode;
                webResponse.StatusCodeNumber = (int)r.StatusCode;
                webResponse.Result = r.Content;
                webResponse.ErrorOccured = r.StatusCode == HttpStatusCode.OK ? false : true;
                tcs.SetResult(selector(webResponse));
            }
            else
            {
                tcs.SetException(new Exception(r.StatusCode.ToString()));
            }
        });
        return tcs.Task;
    }
    private static Task<T> GetResponseFromServerForMW<T>(this RestClient client, IRestRequest request, Func<WebDownloadResult, T> selector)
    {
        var tcs = new TaskCompletionSource<T>();
        WebDownloadResult webResponse = new WebDownloadResult();
        var loginResponse = client.ExecuteAsync(request, r =>
        {
            if (r.ErrorException == null && r.StatusCode == HttpStatusCode.OK)
            {
                webResponse.StatusCode = r.StatusCode;
                if (r.Headers.FirstOrDefault(header => header.Name.Equals("P_RET_SYNC_ID")).Value != null)
                {
                    webResponse.AdditionalParameter = r.Headers.FirstOrDefault(header => header.Name.Equals("P_RET_SYNC_ID")).Value;
                }
                webResponse.StatusCodeNumber = (int)r.StatusCode;
                webResponse.Result = r.RawBytes;
                webResponse.ErrorOccured = r.StatusCode == HttpStatusCode.OK ? false : true;
                tcs.SetResult(selector(webResponse));
            }
            else
            {
                tcs.SetException(new Exception(r.StatusCode.ToString()));
            }
        });
        return tcs.Task;
    }
    private static Task<T> GetRawResponseFromServer<T>(this RestClient client, IRestRequest request, Func<WebDownloadResult, T> selector)
    {
        var tcs = new TaskCompletionSource<T>();
        WebDownloadResult webResponse = new WebDownloadResult();
        var loginResponse = client.ExecuteAsync(request, r =>
        {
            if (r.ErrorException == null && r.StatusCode == HttpStatusCode.OK)
            {
                webResponse.StatusCode = r.StatusCode;
                webResponse.StatusCodeNumber = (int)r.StatusCode;
                webResponse.Result = r.RawBytes;
                webResponse.ErrorOccured = r.StatusCode == HttpStatusCode.OK ? false : true;
                tcs.SetResult(selector(webResponse));
            }
            else
            {
                tcs.SetException(new Exception(r.StatusDescription));
            }
        });
        return tcs.Task;
    }
    public static Task<WebDownloadResult> GetResponseAsync(this RestClient client, IRestRequest request)
    {
        return client.GetResponseFromServer(request, r => r);
    }
    public static Task<WebDownloadResult> GetResponseAsyncForMW(this RestClient client, IRestRequest request)
    {
        return client.GetResponseFromServerForMW(request, r => r);
    }
    public static Task<WebDownloadResult> GetResponseBytesAsync(this RestClient client, IRestRequest request)
    {
        return client.GetRawResponseFromServer(request, r => r);
    }

}

和网络下载结果如下：

public class WebDownloadResult
{
    public HttpStatusCode StatusCode { get; set; }
    public string ErrorMessage { get; set; }
    public int StatusCodeNumber { get; set; }
    public bool ErrorOccured { get; set; }
    public object Result { get; set; }
    public object AdditionalParameter { get; set; }
}

request.AddParameter("Timeout", options.Timeout.Value);

var client = new RestClient(baseUrl)
{
    Timeout = someTimeoutInMilliseconds
};
var request = new RestRequest(url)
{
    Method = Method.GET,
    Timeout = someTimeoutInMilliseconds
};