windows phone 操作 http异步返回结果

wp中为了提升用户体验，砍掉了http的同步操作，仅支持http异步请求，那么该如何及时处理异步操作返回的结果。纠结了很久，终于在技术群中好友的帮助下解决了问题，借助事件，将异步编程模型模式简单的处理成类似webclient的事件异步模式（windows phone 7的）。

class Helper

    {

        public Action<string> DownLoadStringCompleted = null;

        public void HtmlGet(string url)

        {

            HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url);

            request.BeginGetResponse(asyn =>

            {

                var httpResult = (HttpWebRequest)asyn.AsyncState;

                var response = (HttpWebResponse)request.EndGetResponse(asyn);

                using (StreamReader reader = new StreamReader(response.GetResponseStream()))

                {

                    string result = reader.ReadToEnd();

                    //处理返回的html

                    if (DownLoadStringCompleted != null)

                    {

                        DownLoadStringCompleted(result);

                    }

                };

            }, request);

        }

    }

之后变可以向使用WebClient的OpenReadAsync一样处理数据

windows phone 8 实现方式的改变

public class HttpHelper

    {

        public async Task<string> GetUrlContentAsync(string url)

        {

            var request = WebRequest.CreateHttp(url);

            string result;

            try

            {

                using (WebResponse response = await request.GetResponseAsync())

                {

                    using (var reader = new StreamReader(response.GetResponseStream()))

                    {

                        result = await reader.ReadToEndAsync();

                    }

                }

            }

            catch (WebException webExc)

            {

                throw webExc;

            }            

            return result;

        }

        //private HttpClient client; 

        public Task<HttpWebResponse> GetResponseAsync(HttpWebRequest request)

        {

            var taskComplete = new TaskCompletionSource<HttpWebResponse>();

            try

            {

                request.BeginGetResponse(asyncResponse =>

                {

                    HttpWebRequest responseRequest = (HttpWebRequest)asyncResponse.AsyncState;

                    HttpWebResponse response = responseRequest.EndGetResponse(asyncResponse) as HttpWebResponse;

                    taskComplete.TrySetResult(response);

                }, request);

            }

            catch (WebException webExc)

            {

                HttpWebResponse failedResponse = (HttpWebResponse)webExc.Response;

                taskComplete.TrySetResult(failedResponse);

            }

            return taskComplete.Task;

        }

    }

巴特西

windows phone 操作 http异步返回结果

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