C# HttpWebRequest Post Get 请求数据

Post请求

 //data  
                string cookieStr = "Cookie信息";  
                string postData = string.Format("userid={0}&password={1}", "参数1", "参数2");  
                byte[] data = Encoding.UTF8.GetBytes(postData);  
  
                // Prepare web request...  
                HttpWebRequest request = (HttpWebRequest)WebRequest.Create("https://www.xxx.com");  
                request.Method = "POST";  
                //request.Referer = "https://www.xxx.com";  
                request.ContentType = "application/x-www-form-urlencoded; charset=UTF-8";  
                request.UserAgent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36";  
                //request.Host = "www.xxx.com";  
                request.Headers.Add("Cookie", cookieStr);  
                request.ContentLength = data.Length;  
                Stream newStream = request.GetRequestStream();  
  
                // Send the data.  
                newStream.Write(data, 0, data.Length);  
                newStream.Close();  
  
                // Get response  
                HttpWebResponse myResponse = (HttpWebResponse)request.GetResponse();  
                StreamReader reader = new StreamReader(myResponse.GetResponseStream(), Encoding.UTF8);  
                string content = reader.ReadToEnd();  
                Console.WriteLine(content);  
                Console.ReadLine();  

/// <summary>  
       /// 创建POST方式的HTTP请求  
       /// </summary>  
       /// <param name="url">请求的URL</param>  
       /// <param name="parameters">随同请求POST的参数名称及参数值字典</param>  
       /// <param name="timeout">请求的超时时间</param>  
       /// <param name="userAgent">请求的客户端浏览器信息，可以为空</param>  
       /// <param name="requestEncoding">发送HTTP请求时所用的编码</param>  
       /// <param name="cookies">随同HTTP请求发送的Cookie信息，如果不需要身份验证可以为空</param>  
       /// <returns></returns>  
       public static HttpWebResponse CreatePostHttpResponse(string url,IDictionary<string,string> parameters,int? timeout, string userAgent,Encoding requestEncoding,CookieCollection cookies)  
       {  
           if (string.IsNullOrEmpty(url))  
           {  
               throw new ArgumentNullException("url");  
           }  
           if(requestEncoding==null)  
           {  
               throw new ArgumentNullException("requestEncoding");  
           }  
           HttpWebRequest request=null;  
           //如果是发送HTTPS请求  
           if(url.StartsWith("https",StringComparison.OrdinalIgnoreCase))  
           {  
               ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(CheckValidationResult);  
               request = WebRequest.Create(url) as HttpWebRequest;  
               request.ProtocolVersion=HttpVersion.Version10;  
           }  
           else 
           {  
               request = WebRequest.Create(url) as HttpWebRequest;  
           }  
           request.Method = "POST";  
           request.ContentType = "application/x-www-form-urlencoded";  
             
           if (!string.IsNullOrEmpty(userAgent))  
           {  
               request.UserAgent = userAgent;  
           }  
           else 
           {  
               request.UserAgent = DefaultUserAgent;  
           }  

           if (timeout.HasValue)  
           {  
               request.Timeout = timeout.Value;  
           }  
           if (cookies != null)  
           {  
               request.CookieContainer = new CookieContainer();  
               request.CookieContainer.Add(cookies);  
           }  
           //如果需要POST数据  
           if(!(parameters==null||parameters.Count==0))  
           {  
               StringBuilder buffer = new StringBuilder();  
               int i = 0;  
               foreach (string key in parameters.Keys)  
               {  
                   if (i > 0)  
                   {  
                       buffer.AppendFormat("&{0}={1}", key, parameters[key]);  
                   }  
                   else 
                   {  
                       buffer.AppendFormat("{0}={1}", key, parameters[key]);  
                   }  
                   i++;  
               }  
               byte[] data = requestEncoding.GetBytes(buffer.ToString());  
               using (Stream stream = request.GetRequestStream())  
               {  
                   stream.Write(data, 0, data.Length);  
               }  
           }  
           return request.GetResponse() as HttpWebResponse;  
       }  
调用

string loginUrl = "https://passport.baidu.com/?login";  
string userName = "userName";  
string password = "password";  
string tagUrl = "http://cang.baidu.com/"+userName+"/tags";  
Encoding encoding = Encoding.GetEncoding("gb2312");  

IDictionary<string, string> parameters = new Dictionary<string, string>();  
parameters.Add("tpl", "fa");  
parameters.Add("tpl_reg", "fa");  
parameters.Add("u", tagUrl);  
parameters.Add("psp_tt", "0");  
parameters.Add("username", userName);  
parameters.Add("password", password);  
parameters.Add("mem_pass", "1");  
HttpWebResponse response = HttpWebResponseUtility.CreatePostHttpResponse(loginUrl, parameters, null, null, encoding, null);  
string cookieString = response.Headers["Set-Cookie"]; 

Get请求

/// <summary>  
       /// 创建GET方式的HTTP请求  
       /// </summary>  
       /// <param name="url">请求的URL</param>  
       /// <param name="timeout">请求的超时时间</param>  
       /// <param name="userAgent">请求的客户端浏览器信息，可以为空</param>  
       /// <param name="cookies">随同HTTP请求发送的Cookie信息，如果不需要身份验证可以为空</param>  
       /// <returns></returns>  
       public static HttpWebResponse CreateGetHttpResponse(string url,int? timeout, string userAgent,CookieCollection cookies)  
       {  
           if (string.IsNullOrEmpty(url))  
           {  
               throw new ArgumentNullException("url");  
           }  
           HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;  
           request.Method = "GET";  
           request.UserAgent = DefaultUserAgent;  
           if (!string.IsNullOrEmpty(userAgent))  
           {  
               request.UserAgent = userAgent;  
           }  
           if (timeout.HasValue)  
           {  
               request.Timeout = timeout.Value;  
           }  
           if (cookies != null)  
           {  
               request.CookieContainer = new CookieContainer();  
               request.CookieContainer.Add(cookies);  
           }  
           return request.GetResponse() as HttpWebResponse;  
       } 

string userName = "userName";  
string tagUrl = "http://cang.baidu.com/"+userName+"/tags";  
CookieCollection cookies = new CookieCollection();//如何从response.Headers["Set-Cookie"];中获取并设置CookieCollection的代码略  
response = HttpWebResponseUtility.CreateGetHttpResponse(tagUrl, null, null, cookies);