/**
* 调用统一下单，获得下单结果
* @return 统一下单结果
* @失败时抛异常WxPayException
*/
public WxPayData GetUnifiedOrderResult(Enroll enroll, Course course)
{
//统一下单
WxPayData data = new WxPayData();
data.SetValue("body", "优杰学车-在线报名");
data.SetValue("detail", $"客户于{enroll.UpdateTime.ToString("yyyy-MM-dd HH:mm:ss")}在线报名{course.Name}{enroll.Amount}元."); //商品详情
data.SetValue("out_trade_no", enroll.OrderNo);
data.SetValue("total_fee", (Math.Round(enroll.Amount * 100, 0)).ToString()); //微信支付提交的金额是不能带小数点的，且是以分为单位，所以我们系统如果是以元为单位要处理下金额，即先乘以100，再去小数点
data.SetValue("time_start", DateTime.Now.ToString("yyyyMMddHHmmss"));
data.SetValue("time_expire", DateTime.Now.AddMinutes(10).ToString("yyyyMMddHHmmss"));
data.SetValue("trade_type", "JSAPI");
data.SetValue("openid", openid);
WxPayData result = WxPayApi.UnifiedOrder(data);
if (!result.IsSet("appid") || !result.IsSet("prepay_id") || result.GetValue("prepay_id").ToString() == "")
{
throw new WxPayException("UnifiedOrder response error!");
}
unifiedOrderResult = result;
return(result);
}