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这篇文章主要为大家详细解析了微信公众平台开发之获得ACCESSTOKEN .Net代码，感兴趣的小伙伴们可以参考一下

成为了开发者之后微信平台会给您appid和secret，在订阅号中是没有的，所以因该申请一下服务号，有了ACCESSTOKEN才能做添加菜单，上传/下载图片等功能。

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;

     }

   }

以上就是本文的全部内容，希望对大家的学习有所帮助