我用C#.net做的链接页面

protected void Page_Load(object sender, EventArgs e)
    {
        string strPost = "client_id=XXXXXXX&client_secret=XXXXXXXXXXXXXXXXX&grant_type=silent&kdt_id=XXXXXXX";
        string result = string.Empty;
        byte[] buffer = Encoding.UTF8.GetBytes(strPost);
        StreamWriter mywriter = null;
        HttpWebRequest objrequest = (HttpWebRequest)WebRequest.Create("https://open.youzan.com/oauth/token");
        objrequest.Method = "POST";
        objrequest.ContentLength = buffer.Length;
        objrequest.ContentType = "text/xml";
        try
        {
            mywriter = new StreamWriter(objrequest.GetRequestStream());
            mywriter.Write(strPost);
        }
        catch (Exception)
        {
            result = "发送文件流失败！";
        }
        finally
        {
            mywriter.Close();
        }
        HttpWebResponse objresponse = (HttpWebResponse)objrequest.GetResponse();
        using (StreamReader sr = new StreamReader(objresponse.GetResponseStream()))
        {
            result = sr.ReadToEnd();
            sr.Close();
        }
        lblPostBack.Text = result;
    }

返回提示

{"error_description":"缺少参数grant_type","error":"41000"}

请技术员大神帮忙看一下哪里出错了

本帖最后由 水流千山 于 2018-8-10 22:36 编辑

https://github.com/hesi726/youzan_csharp_sdk