一个使用HttpWebRequest类下载指定URL网页的例子

      /**//// <summary>
        /// 下载URL指定网页
        /// </summary>
        /// <param name="url">下载网页的URL</param>
        /// <param name="reff">来路URL</param>
        /// <returns></returns>
        static public  string GetPage(string url,string reff)
        ...{
            HttpWebRequest myHttpWebRequest = (HttpWebRequest)WebRequest.Create(url);
            myHttpWebRequest.Referer = reff;           
            HttpWebResponse myHttpWebResponse = (HttpWebResponse)myHttpWebRequest.GetResponse(); 
            Stream receiveStream = myHttpWebResponse.GetResponseStream();
            Encoding encode = System.Text.Encoding.Default;
            StreamReader readStream = new StreamReader(receiveStream, encode);
            Char[] read = new Char[1024];    
            int count = readStream.Read( read, 0, 1024 );
            StringBuilder sb=new StringBuilder();
            while (count > 0) 
            ...{
                String str = new String(read, 0, count);
                sb.Append(str);
                count = readStream.Read(read, 0, 1024);
            }
            myHttpWebResponse.Close();
            readStream.Close();
            return sb.ToString();
        }