代碼如下:
  //Get請求方式
    private string RequestGet(string Url)
    {
        string PageStr = string.Empty;//用于存放還回的html
        Uri url = new Uri(Url);//Uri類 提供統一資源標識符 (URI) 的對象表示形式和對 URI 各部分的輕松訪問。就是處理url地址
        try
        {
            HttpWebRequest httprequest = (HttpWebRequest)WebRequest.Create(url);//根據url地址創建HTTpWebRequest對象
            #region 參數設置
            httprequest.Method = "get";

            //---------------------------------------------設定一些參數（不必要可以）
            //httprequest.KeepAlive = false;//持久連接設置為false
            //httprequest.ProtocolVersion = HttpVersion.Version11;// 網絡協議的版本
            //httprequest.Proxy = WebProxy.GetDefaultProxy();//服務器代理
            //httprequest.ContentType = "application/x-www-form-urlencoded";//http 頭
            //httprequest.AllowAutoRedirect = true;
            //httprequest.MaximumAutomaticRedirections = 10;
            //httprequest.Timeout = 30000;//設定超時十秒（毫秒）
            //httprequest.UserAgent = "mozilla/4.0 (compatible; msie 6.0; windows nt 5.1)"; //瀏覽器
            //=================================================
            #endregion
            HttpWebResponse response = (HttpWebResponse)httprequest.GetResponse();//使用HttpWebResponse獲取請求的還回值
            Stream steam = response.GetResponseStream();//從還回對象中獲取數據流
            StreamReader reader = new StreamReader(steam, Encoding.GetEncoding("gb2312"));//讀取數據Encoding.GetEncoding("gb2312")指編碼是gb2312，不讓中文會亂碼的
            PageStr = reader.ReadToEnd();
            reader.Close();