Weather forecast interface: the method of calculating key with c# in SmartWeather API.

String GetKey (string appid, string privateKey, string areaId, string date, string type)

{

//HMAC uses SHA 1

HMAC hmac = HMACSHA 1。 create()；

var publicKey = "/data/？ areaid = { 0 } & amptype = { 1 } & amp； Date = {2} & ampappid = {3} "；;

Var data = system. Text.Encoding.UTF8.GetBytes (string. Format(publicKey，areaId，type，date，appid))；

//key

Var key = system. text . encoding . utf8 . getbytes(private key)；

hmac。 Key = key

//signing data

var signedData = hmac。 ComputeHash (data);

Return to the transformation. to base 64 string(signed data)；

}

Reference: blogs.com/aptdo2008/p/3566391.html.