微信公共平台开发-（.net实现）2--ACCESSTOKEN值获得

    private string GetToken()  
         {  
      
             // 也可以这样写:  
             //return  GetPage("https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=你的appid&secret=你的secret", "");  
             
             string res = "";  
             HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create("https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential  
    &appid=你的appid&secret=你的secret");  
     req.Method = "GET";  
             using (WebResponse wr = req.GetResponse())  
             {  
                 HttpWebResponse myResponse = (HttpWebResponse)req.GetResponse();  
      
      
                 StreamReader reader = new StreamReader(myResponse.GetResponseStream(), Encoding.UTF8);  
      
      
                 string content = reader.ReadToEnd();  
         
                 List<ACCESSTOKEN> myACCESSTOKEN = Json.JSONStringToList<ACCESSTOKEN>(content);  
                 res = myACCESSTOKEN[0].access_token;  
       
             }       
      
             return res;  
         }  
         public string GetPage(string posturl, string postData)  
         {  
             Stream outstream = null;  
             Stream instream = null;  
             StreamReader sr = null;  
             HttpWebResponse response = null;  
             HttpWebRequest request = null;  
             Encoding encoding = Encoding.UTF8;  
             byte[] data = encoding.GetBytes(postData);  
             // 准备请求...  
             try  
             {  
                 // 设置参数  
                 request = WebRequest.Create(posturl) as HttpWebRequest;  
                 CookieContainer cookieContainer = new CookieContainer();  
                 request.CookieContainer = cookieContainer;  
                 request.AllowAutoRedirect = true;  
                 request.Method = "POST";  
                 request.ContentType = "application/x-www-form-urlencoded";  
                 request.ContentLength = data.Length;  
                 outstream = request.GetRequestStream();  
                 outstream.Write(data, 0, data.Length);  
                 outstream.Close();  
                 //发送请求并获取相应回应数据  
                 response = request.GetResponse() as HttpWebResponse;  
                 //直到request.GetResponse()程序才开始向目标网页发送Post请求  
                 instream = response.GetResponseStream();  
                 sr = new StreamReader(instream, encoding);  
                 //返回结果网页（html）代码  
                 string content = sr.ReadToEnd();  
                 string err = string.Empty;  
                 return content;  
             }  
             catch (Exception ex)  
             {  
                 string err = ex.Message;  
                 Response.Write(err);  
                 return string.Empty;  
             }  
         }