WP7中HttpWebRequest的使用方法之POST方式

　　　在WP7中的HttpWebRequest与在C#中的使用方式大致是一样的，但是在WP7中微软移去了同步的操作方式，所有的操作方式都改为异步，（提升用户体验，在请求过程中界面保持流畅）。

下面给出两种编码方式 ：其实都是一样的，只是第一种使用了独立方法的完成，（便于阅读和理解），第二种是直接用委托写在同一个方法里。

第一种：

 1  　　　　CookieContainer cc = null;

 2         private void button1_Click(object sender, RoutedEventArgs e)

 3         {

 4             string url = "http://www.cnblogs.com/xdpxyxy";

 5 

 6             HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(new Uri(url));

 7 

 8             if (cc == null)

 9             {

10                 cc = new CookieContainer();

11             }

12             myRequest.CookieContainer = cc;

13 

14             myRequest.Method = "POST";

15 

16             myRequest.ContentType = "application/x-www-form-urlencoded";

17 

18             myRequest.BeginGetRequestStream(new AsyncCallback(GetRequestStreamCallback), myRequest);

19 

20         }

21 

22         /// <summary>

23         ///  写入Stream的异步请求

24         /// </summary>

25         /// <param name="asynchronousResult"></param>

26         private void GetRequestStreamCallback(IAsyncResult asynchronousResult)

27         {

28 

29             HttpWebRequest request = (HttpWebRequest)asynchronousResult.AsyncState;

30 

31             System.IO.Stream postStream = request.EndGetRequestStream(asynchronousResult);

32 

33             //POST提交服务器的资源

34             string PostData = "";

35 

36             byte[] byteArray = System.Text.Encoding.UTF8.GetBytes(PostData);

37 

38             postStream.Write(byteArray, 0, PostData.Length);

39 

40             postStream.Close();

41 

42             request.BeginGetResponse(new AsyncCallback(GetResponseCallback), request);

43 

44         }

45 

46         /// <summary>

47         /// 对服务器资源异步请求

48         /// </summary>

49         /// <param name="asynchronousResult"></param>

50         private void GetResponseCallback(IAsyncResult asynchronousResult)

51         {

52 

53             HttpWebRequest request = (HttpWebRequest)asynchronousResult.AsyncState;

54 

55             HttpWebResponse response = (HttpWebResponse)request.EndGetResponse(asynchronousResult);

56 

57             Stream streamResponse = response.GetResponseStream();

58 

59             StreamReader streamRead = new StreamReader(streamResponse);

60 

61             string responseString = streamRead.ReadToEnd();

62 

63             streamRead.Close();

64 

65             streamResponse.Close();

66 

67         }

第二种 ：

 1 　　　　　　　HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create(new Uri(PostUrl));

 2             httpWebRequest.ContentType = "application/x-www-form-urlencoded";

 3             httpWebRequest.Method = "POST";

 4             if (co == null)

 5             {

 6                 httpWebRequest.CookieContainer = new CookieContainer();

 7             }

 8             else

 9             {

10                 httpWebRequest.CookieContainer = co;

11             }

12             httpWebRequest.BeginGetRequestStream((IAsyncResult streamCallback) =>

13             {

14                 HttpWebRequest webRequest = streamCallback.AsyncState as HttpWebRequest;

15 

16                 byte[] buffer = Encoding.UTF8.GetBytes(PostData);

17                 Stream stream = webRequest.EndGetRequestStream(streamCallback);

18                 stream.Position = 0;

19                 stream.Write(buffer, 0, buffer.Length);

20                 stream.Close();

21                 webRequest.BeginGetResponse((IAsyncResult responseCallback) =>

22                 {

23                     HttpWebRequest webRequest2 = responseCallback.AsyncState as HttpWebRequest;

24                     HttpWebResponse webResponse = (HttpWebResponse)webRequest2.EndGetResponse(responseCallback);

25                     Stream streamResponse = webResponse.GetResponseStream();

26                     StreamReader sr = new StreamReader(streamResponse);

27                     string str = sr.ReadToEnd();

28                 }, webRequest);

29             }, httpWebRequest);