HttpHelpers类普通GET和POST方式，带Cookie和带证书验证模式

HttpHelpers类普通GET和POST方式，带Cookie和带证书验证模式

参考路径：https://www.cnblogs.com/splendidme/archive/2011/09/14/2175364.html

 /// <summary>
 /// 类说明：HttpHelps类，用来实现Http访问，Post或者Get方式的，直接访问，带Cookie的，带证书的等方式
 /// 编码日期：2011-09-13

 /// </summary>using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Web;
 using System.Text;
 using System.Net;
 using System.IO;
 using System.Security.Cryptography.X509Certificates;
 using System.Net.Security;
 using System;

 /// <summary>
 ///HttpHelpers 主要是实现Http方式的Get和Post方式请求
 /// </summary>
 public class HttpHelpers
 {
     /// <summary>
     /// 构造器实现默认属性的赋值
     /// </summary>
     public HttpHelpers()
     {
         //设置请求方式为Post
         request.Method = "GET";
         request.Accept = "text/html, application/xhtml+xml, */*";
         request.ContentType = "application/x-www-form-urlencoded";
     }

     #region 所有的属性

     //访问的页面地址
     private string RequestURl { get; set; }

     //默认的编码
     private Encoding encoding { get; set; }

     //HttpWebRequest对象用来发起请求
     private HttpWebRequest request { get; set; }

     //获取影响流的数据对象
     private HttpWebResponse response { get; set; }

     //证书文件X509Certificate objx509 = new X509Certificate(Application.StartupPath + "\\123.cer");
     X509Certificate objx509 { get; set; }

     //请求方式目前只提供Post和Get方式
     private string Method { get; set; }

     //Accept属性
     private string Accept { get; set; }

     //ContentType属性
     private string ContentType { get; set; }

     //UserAgent属性
     private string UserAgent { get; set; }

     //Cookie列表
     private CookieContainer cookie { get; set; }

     //需要返回的数据对象
     private string reutrnDate { get; set; }

     //Post数据串
     private string strPostdata { get; set; }

     #endregion

     #region 内部方法

     //回调验证证书问题
     private bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors)
     {
         // 总是接受
         return true;
     }

     /// <summary>
     /// 根据相传入的数据，得到相应页面数据
     /// </summary>
     /// <param name="strPostdata">传入的数据Post方式,get方式传NUll或者空字符串都可以</param>
     /// <returns>string类型的响应数据</returns>
     private string GetHttpRequestData()
     {
         try
         {
             //是否要添加证书验证
             if (objx509 != null)
             {
                 //这一句一定要写在创建连接的前面。使用回调的方法进行证书验证。
                 ServicePointManager.ServerCertificateValidationCallback =
                     new System.Net.Security.RemoteCertificateValidationCallback(CheckValidationResult);
             }

             //创建request对象
             request = (HttpWebRequest)WebRequest.Create(RequestURl);

             //是否要添加证书验证
             if (objx509 != null)
                 request.ClientCertificates.Add(objx509);

             //是否带有Cookie值
             if (cookie != null)
                 request.CookieContainer = cookie;

             //当为post提交是需要填充数据
             if (Method.Trim().ToLower() == "post")
             {
                 byte[] buffer = encoding.GetBytes(strPostdata);
                 request.ContentLength = buffer.Length;
                 request.GetRequestStream().Write(buffer, , buffer.Length);
             }

             //得到请求的response
             using (response = (HttpWebResponse)request.GetResponse())
             {
                 //从这里开始我们要无视编码了
                 if (encoding == null)
                     GetEonding();

                 //开始读取流并设置编码方式
                 using (StreamReader reader = new StreamReader(response.GetResponseStream(), encoding))
                 {
                     //从当前开始读取整个流数据，默认为0所以读取的是全部，并返回数据
                     reutrnDate = reader.ReadToEnd().ToString().Trim();
                 }
             }
         }
         catch (Exception)
         {
             //这里是在发生异常时返回的错误信息
             reutrnDate = "String Error";
         }
         return reutrnDate;
     }

     /// <summary>
     /// 得到response对象的编码类型
     /// </summary>
     private void GetEonding()
     {
         if (response.CharacterSet.Trim() != "")
             encoding = System.Text.Encoding.GetEncoding(response.CharacterSet.Trim());
         else
             encoding = System.Text.Encoding.UTF8;
     }

     #endregion

     #region 公开方法

     /// <summary>
     /// 只设置一些简单参数的方式
     /// </summary>
     /// <param name="_url">URl地址</param>
     /// <param name="_strPostdata">Post请求方式时传入的数据</param>
     /// <param name="_Method">请求方式GET或者POST可以为空默认为GET</param>
     /// <param name="_encoding">编码方式可以为空默认为UTF-8</param>
     /// <param name="_Accept">Accept属性</param>
     /// <param name="_ContentType">ContentType属性</param
     /// <param name="_UserAgent">UserAgent属性</param
     /// <param name="_cookie">CookieContainer列表</param
     /// <param name="_objx509">X509Certificate证书对象</param
     /// <returns>请求所得到的数据</returns>
     public string GetString_null(string _url, string _strPostdata, string _Method, Encoding _encoding, string _Accept,
         string _ContentType, string _UserAgent, CookieContainer _cookie, X509Certificate _objx509)
     {
         RequestURl = _url;
         Method = _Method;
         encoding = _encoding;
         Accept = _Accept;
         ContentType = _ContentType;
         UserAgent = _UserAgent;
         cookie = _cookie;
         objx509 = _objx509;
         return GetHttpRequestData();
     }

     /// <summary>
     /// 只设置一些简单参数的方式
     /// </summary>
     /// <param name="_url">URl地址</param>
     /// <param name="_strPostdata">Post请求方式时传入的数据</param>
     /// <param name="_Method">请求方式GET或者POST可以为空默认为GET</param>
     /// <param name="_encoding">编码方式可以为空默认为UTF-8</param>
     /// <returns>请求所得到的数据</returns>
     public string GetString_type(string _url, string _Method, Encoding _encoding)
     {
         RequestURl = _url;
         Method = _Method;
         encoding = _encoding;
         return GetHttpRequestData();
     }

     //下面大家自己可以多写几种常用的，呵呵

     #endregion

 }