C# wx获取token的基本方法

#region 请求url，不发送数据

/// <summary>
/// 请求url，不发送数据
/// </summary>
public static string requesturl(string url)
{
return requesturl(url, "post");
}

#endregion

#region 请求url，不发送数据

/// <summary>
/// 请求url，不发送数据
/// </summary>
public static string requesturl(string url, string method)
{
// 设置参数
var request = webrequest.create(url) as httpwebrequest;
var cookiecontainer = new cookiecontainer();
request.cookiecontainer = cookiecontainer;
request.allowautoredirect = true;
request.method = method;
request.contenttype = "text/html";
request.headers.add("charset", "utf-8");
//发送请求并获取相应回应数据
var response = request.getresponse() as httpwebresponse;
//直到request.getresponse()程序才开始向目标网页发送post请求
stream responsestream = response.getresponsestream();
var sr = new streamreader(responsestream, encoding.utf8);
//返回结果网页（html）代码
string content = sr.readtoend();

return content;
}

#endregion

 

#region 获取json字符串某节点的值

/// <summary>
/// 获取json字符串某节点的值
/// </summary>
public static string getjsonvalue(string jsonstr, string key)
{
string result = string.empty;
if (!string.isnullorempty(jsonstr))
{
key = "\"" + key.trim('"') + "\"";
int index = jsonstr.indexof(key) + key.length + 1;
if (index > key.length + 1)
{
//先截逗号，若是最后一个，截"｝"号，取最小值
int end = jsonstr.indexof(',', index);
if (end == -1)
{
end = jsonstr.indexof('}', index);
}
result = jsonstr.substring(index, end - index);
result = result.trim(new [] {'"', ' ', '\"'}); //过滤引号或空格
}
}
return result;
}

#endregion

#region 验证token是否过期

/// <summary>
/// 验证token是否过期
/// </summary>
public static bool tokenexpired(string access_token)
{
string jsonstr =
requesturl(string.format("https://api.weixin.qq.com/cgi-bin/menu/get?access_token={0}",
access_token));
if (getjsonvalue(jsonstr, "errcode") == "42001")
{
return true;
}
return false;
}

#endregion

#region 获取token

/// <summary>
/// 获取token
/// </summary>
public static string gettoken(string appid, string secret)
{
string strjson =
requesturl(
string.format(
"https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid={0}&secret={1}",
appid, secret));
return getjsonvalue(strjson, "access_token");
}

#endregion

//获取openid

public static string getopenid(string appid, string secret, string code)
{
string strjson =
requesturl(
string.format(
"https://api.weixin.qq.com/sns/jscode2session?appid={0}&secret={1}&js_code={2}&grant_type=authorization_code",
appid, secret, code));
//logutil.writelog(strjson);
return getjsonvalue(strjson, "openid");
}