如何認證成為開發者？請點擊第一篇文章進行查看，成為了開發者之后微信平臺會給您appid和secret，在訂閱號中是沒有的，所以因該申請一下服務號，有了ACCESSTOKEN才能做添加菜單，上傳/下載圖片等功能。
private string GetToken()
{
// 也可以這樣寫:
//return GetPage("https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credentialappid=你的appidsecret=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appidsecret=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();
ListACCESSTOKEN> myACCESSTOKEN = Json.JSONStringToListACCESSTOKEN>(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);
// 準備請求...
try
{
// 設置參數
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();
//發送請求并獲取相應回應數據
response = request.GetResponse() as HttpWebResponse;
//直到request.GetResponse()程序才開始向目標網頁發送Post請求
instream = response.GetResponseStream();
sr = new StreamReader(instream, encoding);
//返回結果網頁（html）代碼
string content = sr.ReadToEnd();
string err = string.Empty;
return content;
}
catch (Exception ex)
{
string err = ex.Message;
Response.Write(err);
return string.Empty;
}
}
