c#生成微信小程序二维码

1.后端代码
[HttpPost]
public byte[] getTgyQRCodeAsync2([FromBody] dynamic Json)
{
string token = GetAccessToken2();

        var scene = Json.accout.ToString();
        var page = "pages/myIndex/clinicSign/clinicSign";

        var url = string.Format("https://api.weixin.qq.com/wxa/getwxacodeunlimit?access_token={0}", token);

        var postData = new
        {
            scene,
            page,
      
        }.ToJson();
        System.Net.HttpWebRequest request;
        request = (System.Net.HttpWebRequest)WebRequest.Create(url);
        request.Method = "POST";
        request.ContentType = "application/json;charset=UTF-8";
        byte[] payload;
        payload = System.Text.Encoding.UTF8.GetBytes(postData);
        request.ContentLength = payload.Length;
        Stream writer = request.GetRequestStream();
        writer.Write(payload, 0, payload.Le
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