HttpWebRequest实现浏览器请求(Cookie)

　private CookieContainer cookieContainer =  = new CookieContainer();

　　public string RequestByPost(string url, string postData)

　　{

　　int num = 3;

　　string str = null;

　　while (num-- > 0)

　　{

　　try

　　{

　　Thread.Sleep((int)(delayTime * 0x3e8));

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

　　request.UserAgent = "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 2.0.50727)";

　　request.Method = "POST";

　　request.Accept = "/upload/users/1/20131206/png,*/*;q=0.5";

　　request.KeepAlive = true;

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

　　request.CookieContainer = this.cookieContainer;

　　//request.Proxy = this.webProxy;

　　HttpRequestCachePolicy policy = new HttpRequestCachePolicy(HttpRequestCacheLevel.NoCacheNoStore);

　　request.CachePolicy = policy;

　　byte[] bytes = Encoding.GetEncoding("GB2312").GetBytes(postData);

　　request.ContentLength = bytes.Length;

　　Stream requestStream = request.GetRequestStream();

　　requestStream.Write(bytes, 0, bytes.Length);

　　requestStream.Close();

　　HttpWebResponse response = (HttpWebResponse)request.GetResponse();

　　StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8, true);

　　str = reader.ReadToEnd();

　　response.Close();

　　reader.Close();

　　return str;

　　}

　　catch (Exception exception)

　　{

　　if (exception.Message.IndexOf("内部服务器错误") > 0)

　　{

　　return "(500)";

　　}

　　Logging("RequestByPost", exception.Message);

　　continue;

　　}

　　}

　　return str;

　　}

　　public string RequestByGet(string url)

　　{

　　int num = 3;

　　string str = null;

　　while (num-- > 0)

　　{

　　try

　　{

　　Thread.Sleep((int)(delayTime * 0x3e8));

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

　　request.Method = "GET";

　　request.CookieContainer = this.cookieContainer;

　　HttpRequestCachePolicy policy = new HttpRequestCachePolicy(HttpRequestCacheLevel.NoCacheNoStore);

　　request.CachePolicy = policy;

　　HttpWebResponse response = (HttpWebResponse)request.GetResponse();

　　StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8, true);

　　str = reader.ReadToEnd();

　　response.Close();

　　reader.Close();

　　return str;

　　}

　　catch (Exception exception)

　　{

　　if (exception.Message.IndexOf("内部服务器错误") > 0)

　　{

　　return "(500)";

　　}

　　Logging("RequestByGet", exception.Message);

　　continue;

　　}

　　}

　　return str;

　　}