c#中使用http请求，工具

1、引用的库

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;

2、核心

namespace JXService.utils
{
    public class HttpUitls
    {
        public static string Get(string Url)
        {
            try {
                //System.GC.Collect();
                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);
                request.Proxy = null;
                request.KeepAlive = false;
                request.Method = "GET";
                request.ContentType = "application/json; charset=UTF-8";
                request.AutomaticDecompression = DecompressionMethods.GZip;

                HttpWebResponse response = (HttpWebResponse)request.GetResponse();
                Stream myResponseStream = response.GetResponseStream();
                StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.UTF8);
                string retString = myStreamReader.ReadToEnd();

                myStreamReader.Close();
                myResponseStream.Close();

                if (response != null)
                {
                    response.Close();
                }
                if (request != null)
                {
                    request.Abort();
                }

                return retString;
                }
            catch (Exception)
            {
                return null;
            }
        }

        public static string Post(string Url, string Data)
        {
            try { 
                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);
                request.Method = "POST";
                byte[] bytes = Encoding.UTF8.GetBytes(Data);
                request.ContentType = "application/x-www-form-urlencoded";
                request.ContentLength = bytes.Length;
                Stream myResponseStream = request.GetRequestStream();
                myResponseStream.Write(bytes, 0, bytes.Length);

                HttpWebResponse response = (HttpWebResponse)request.GetResponse();
                StreamReader myStreamReader = new StreamReader(response.GetResponseStream(), Encoding.UTF8);
                string retString = myStreamReader.ReadToEnd();

                myStreamReader.Close();
                myResponseStream.Close();

                if (response != null)
                {
                    response.Close();
                }
                if (request != null)
                {
                    request.Abort();
                }
                return retString;
            }
            catch (Exception ex)
            {
                return null;
            }
        }
    }
}