微信公共服务平台开发（.Net 的实现）2-------获得ACCESSTOKEN

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

[csharp]
view plaincopyprint?





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;

}
}