C# http get与post请求方法

using System;
using System.Data;
using System.Configuration;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Net;
using System.IO;
using System.Text;
using System.Collections.Generic;

namespace WebAppTest
{
    public class HttpTools
    {

        public static string GetRequest(string url)
        {

            HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url);

            request.Method = "get";

            HttpWebResponse response = (HttpWebResponse)request.GetResponse();

            using(StreamReader sr = new StreamReader(response.GetResponseStream(),Encoding.UTF8))
            {
                string result = sr.ReadToEnd();
                return result;
            }

        }

        public static string PostRequest(string url,Dictionary<object,object> paramList)
        {
            HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url);

            StringBuilder sb = new StringBuilder();

            foreach (var item in paramList)
            {
                sb.Append(item.Key + "=" + item.Value + "&");
            }

            //将参数拼为:"name=test&pwd=123" 这种字符串格式 然后将字符串转为byte数组 最后将byte数组写入请求流中
            string paramData = sb.ToString().Trim(‘&‘);

            byte[] data = System.Text.Encoding.UTF8.GetBytes(paramData);

            //设置post方式
            request.Method = "post";

            //这句不能少  不难post请求 得不到对应的响应结果
            request.ContentType = "application/x-www-form-urlencoded";

            //设置请求参数的长度
            request.ContentLength = data.Length;

            Stream stream = request.GetRequestStream();

            stream.Write(data, 0, data.Length);

            stream.Close();

            /**
             * *****************注意事项********************
             *
             * 不管是get还是post请求最后得到的响应流不能直接stream
             * 不难得不到响应结果
             *
             *
             * 直接使用Stream 不能获取响应的结果值
             *
             * 要使用StreamReader才能获取响应的结果值
             *
             * Stream stream = response.GetResponseStream();
             *
             * byte[] data = new byte[2*1024*1024]
             *
             * int r = stream.Read(data,0,data.Length);
             *
             * string result = System.Text.Encoding.UTF8.GetString(data, 0, r);
             *
             *
             * **/

            HttpWebResponse response = (HttpWebResponse)request.GetResponse();

            using(StreamReader sr = new StreamReader(response.GetResponseStream(),Encoding.UTF8))
            {
                string result = sr.ReadToEnd();
                return result;

            }

        }
    }
}