模拟浏览器请求URL 带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 = "text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/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;
}