get,post提交请求

代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Text;
using System.Net;
using System.IO;
using System.Security.Cryptography;

namespace Test
{
    public partial class WebForm3 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            //string url = "http://111.206.37.135:8080/business/api/ordercreate";
            //string paras = "createTime%3d2014-12-16+11%3a07%3a52%26orderList%3d%5b%7bagentName%3a%e6%90%ba%e7%a8%8b%2citemAmount%3a1%2citemId%3a265802%2citemImgUrl%3a%2citemName%3a%e6%b2%99%e7%89%b9%e9%a6%86%e2%80%9c%e6%9c%88%e4%ba%ae%e8%88%b9%e2%80%9d%e5%95%86%e5%8a%a1VIP%e4%b8%93%e4%ba%ab%e6%9c%8d%e5%8a%a1%2citemOrderTime%3a2014-12-25%2citemPrice%3a12000.00%2citemUrl%3ahttp%3a%2f%2fpiao.ctrip.com%2fdest%2ft138822.html%2citemUrlWap%3ahttp%3a%2f%2fm.ctrip.com%2fwebapp%2fticket%2fdest%2ft138822.html%7d%5d%26Ordername%3d%e4%b8%8a%e6%b5%b7%e4%b8%96%e5%8d%9a%e4%bc%9a%e6%b2%99%e7%89%b9%e9%a6%86%e2%80%9c%e6%9c%88%e4%ba%ae%e8%88%b9%e2%80%9dVIP%e6%9c%8d%e5%8a%a1%26partnerId%3dCtrip%26payWay%3d%e5%9c%a8%e7%ba%bf%e6%94%af%e4%bb%98%26srcOrderId%3d1143395377%26status%3d104%26totalAmount%3d12000.00%26sign%3db9821727999bce3ab9748a2c332cbab";
            //string result = SendByPost(url, paras);

            string url = "http://www.baidu.com";
            string result = SendByGet(url);

        }

        /// <summary>
        /// POST方式提交请求
        /// </summary>
        /// <param name="url"></param>
        /// <param name="result"></param>
        /// <returns></returns>
        public string SendByPost(string url,string paras)
        {
            string result = string.Empty;
            try
            {
                System.Net.HttpWebRequest request;
                request = (System.Net.HttpWebRequest)WebRequest.Create(url);
                //Post请求方式
                request.Method = "POST";
                // 内容类型
                request.ContentType = "application/x-www-form-urlencoded";
                // 参数经过URL编码
                //string paraUrlCoded = System.Web.HttpUtility.UrlEncode("keyword");
                //paraUrlCoded += "=" + System.Web.HttpUtility.UrlEncode("多月");

                byte[] payload;
                //将URL编码后的字符串转化为字节
                payload = System.Text.Encoding.UTF8.GetBytes(paras);
                //设置请求的 ContentLength
                request.ContentLength = payload.Length;
                //获得请 求流
                System.IO.Stream writer = request.GetRequestStream();
                //将请求参数写入流
                writer.Write(payload, 0, payload.Length);
                // 关闭请求流
                writer.Close();
                System.Net.HttpWebResponse response;
                // 获得响应流
                response = (System.Net.HttpWebResponse)request.GetResponse();
                System.IO.StreamReader myreader = new System.IO.StreamReader(response.GetResponseStream(), Encoding.UTF8);
                result = myreader.ReadToEnd();
                myreader.Close();
            }
            catch (Exception ex)
            {
                result = ex.ToString();
            }
            return result;
        }

        /// <summary>
        /// GET方式提交请求
        /// </summary>
        /// <param name="url">注意url必须含http或https</param>
        /// <returns></returns>
        public string SendByGet(string url)
        {
            string result = string.Empty;
            try
            {
                //System.Net.HttpWebRequest request;
                //// 创建一个HTTP请求
                //request = (System.Net.HttpWebRequest)WebRequest.Create(url);
                ////request.Method="get";
                //System.Net.HttpWebResponse response;
                //response = (System.Net.HttpWebResponse)request.GetResponse();
                //System.IO.StreamReader myreader = new System.IO.StreamReader(response.GetResponseStream(), Encoding.UTF8);
                //result = myreader.ReadToEnd();
                //myreader.Close();

                HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
                req.Method = "GET";
                ////设置代理
                //if (CommonFunc.ConvertObjectToString(ConfigurationManager.AppSettings["IsProxy"]).ToUpper() == "T")
                //{
                //    string ProxyAddress = ConfigurationManager.AppSettings["ProxyAddress"].ToString().Trim();
                //    if (!string.IsNullOrEmpty(ProxyAddress))
                //    {
                //        req.UseDefaultCredentials = true;
                //        WebProxy proxy = new WebProxy(ProxyAddress, 8080);
                //        req.Proxy = proxy;
                //    }
                //    logger.Debug("代理", "设置代理服务");
                //}
                req.KeepAlive = true;
                req.Timeout = 300000;
                req.ContentType = "application/x-www-form-urlencoded;charset=utf-8";
                HttpWebResponse rsp = (HttpWebResponse)req.GetResponse();
                Encoding encoding = null;
                try
                {
                    encoding = Encoding.GetEncoding(rsp.CharacterSet);
                }
                catch
                {
                    encoding = Encoding.UTF8;
                }
                Stream stream = rsp.GetResponseStream();
                StreamReader reader = new StreamReader(stream, encoding);
                result = reader.ReadToEnd();
                reader.Close();
                stream.Close();
                rsp.Close();
            }
            catch (Exception ex)
            {
                result = ex.Message;
            }
            return result;
        }
    }
}