C#访问URL方法

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       /// <summary>
        /// 访问URL地址
        /// </summary>
        /// <param name="url">URL地址</param>
        /// <param name="postDataStr">参数</param>
        /// <param name="Encod">编码方式</param>
        /// <returns></returns>
        private static string CallWebPage(string url, string postDataStr, Encoding Encod)
        {
            string rStr = "";
            System.Net.WebRequest req = null;
            System.Net.WebResponse resp = null;
            System.IO.Stream os = null;
            System.IO.StreamReader sr = null;
            try
            {
                //创建连接
                req = System.Net.WebRequest.Create(url);
                //设置访问方式和发送的请求数据的内容类型
                if (string.IsNullOrEmpty(postDataStr))
                {
                    req.ContentType = "application/x-www-form-urlencoded";
                    req.Method = "GET";
                }
                else
                {
                    req.ContentType = "application/x-www-form-urlencoded";
                    req.Method = "POST";
                    if (Encod == null)
                    {
                        Encod = System.Text.Encoding.Default;
                    }
                    byte[] bytes = Encod.GetBytes(postDataStr);
                    req.ContentLength = bytes.Length;
                    os = req.GetRequestStream();
                    os.Write(bytes, 0, bytes.Length);
                    os.Close();
                }

                //读取返回结果
                resp = req.GetResponse();
                sr = new System.IO.StreamReader(resp.GetResponseStrea(),                                                  System.Text.Encoding.Default);
                rStr = sr.ReadToEnd();
            }
            catch (Exception ex1)
            {
                //LogUtil.Warn("HttpUtil.CallWebPage 异常：" + ex1.Message);

            }
            finally
            {
                try
                {
                    //关闭资源
                    if (os != null)
                    {
                        os.Dispose();
                        os.Close();
                    }
                    if (sr != null)
                    {
                        sr.Dispose();
                        sr.Close();
                    }

                    if (resp != null)
                    {
                        resp.Close();

}

                    if (req != null) req = null;
                }
                catch (Exception ex2)
                {
                    //LogUtil.Exception("HttpUtil.CallWebPage 关闭连接异常：" + ex2.Message);
                }
            }
            return rStr;
        }

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