方案资源管理器-在刚创建的 web 项目上右键-添加-新建项-C#-类，命名为 HttpWebPostAndGet，
代码如下：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.IO;
using System.Net;
using System.Text;
namespace WebServicePass
{
public class HttpWebPostAndGet
{
#region Post
/// <summary>
/// 发起一个HTTP请求（以POST方式）
/// </summary>
/// <param name="url"></param>
/// <param name="param"></param>
/// <returns></returns>
public static string HttpPost(string url, string param = "")
{
HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url);
request.Method = "POST";
request.ContentType = "text/xml";
request.Accept = "*/*";
request.Timeout = 100000;//响应超时设置
request.AllowAutoRedirect = false;
StreamWriter requestStream = null;
WebResponse response = null;
string responseStr = null;
try
{
requestStream = new StreamWriter(request.GetRequestStream());
requestStream.Write(param);
requestStream.Close();
response = request.GetResponse();
if (response != null)
{
