【C#MVC】 使用HttpWebRequest访问外部API，并返回json信息 (Access_Key)

public string OpenReadWithHttps(string URL, string strPostdata, string strEncoding)
{
Encoding encoding = Encoding.Default;
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(URL);
request.Method = "post";
request.Headers.Add("access_key", "your access_key");
request.Accept = "application/json";
request.ContentType = "application/json; charset=utf-8";
byte[] buffer = Encoding.ASCII.GetBytes(strPostdata);
request.ContentLength = buffer.Length;
request.GetRequestStream().Write(buffer, 0, buffer.Length);
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
using (StreamReader reader = new StreamReader(response.GetResponseStream(), encoding))
//System.Text.Encoding.GetEncoding(strEncoding)
{
return reader.ReadToEnd();
}
}