Question

我的一些电话在Windows Phone 8上花费的时间较长。称其为异步会给我带来麻烦。

我有时可以同步调用WCF服务方法吗？这样的任何方式？需要紧急回应感谢

Answer 1

所有对网络的调用都必须异步完成。这些方法的同步版本甚至不存在于SDK中。

你看到了什么样的麻烦？即使您的呼叫是同步的，也不会让它们更快地返回。

Answer 2

使用扩展方法和TPL异步。

来自here。

示例：

public async Task<string> GetMyData(string urlToCall)
{
    HttpWebRequest request = (HttpWebRequest)WebRequest.Create(urlToCall);
    request.Method = HttpMethod.Get;
    HttpWebResponse response = (HttpWebResponse)await request.GetResponseAsync();

    using (var sr = new StreamReader(response.GetResponseStream()))
    {
        return sr.ReadToEnd();
    }
}

扩展方法：

 public static class HttpExtensions
    {
        public static Task<HttpWebResponse> GetResponseAsync(this HttpWebRequest request)
        {
            var taskComplete = new TaskCompletionSource<HttpWebResponse>();
            request.BeginGetResponse(asyncResponse =>
            {
                try
                {
                    HttpWebRequest responseRequest = (HttpWebRequest)asyncResponse.AsyncState;
                    HttpWebResponse someResponse = (HttpWebResponse)responseRequest.EndGetResponse(asyncResponse);
                    taskComplete.TrySetResult(someResponse);
                }
                catch (WebException webExc)
                {
                    HttpWebResponse failedResponse = (HttpWebResponse)webExc.Response;
                    taskComplete.TrySetResult(failedResponse);
                }
            }, request);
            return taskComplete.Task;
        }
     }

从Windows Phone 8同步调用WCF

2 个答案: