ASP.NET MVC 微信扫码支付

1、首先到官网下载微信API。

2、解压后将cert、lib两个文件夹复制到项目更目录下。

3、微信扫码支付

　　3.1、控制器代码

private string GetPayUrl(OrderDto order,string ip)
        {
            if (order == null)
            {
                throw new ArgumentNullException("order");
            }
            var product = ....;  //商品信息
            WxPayData data = new WxPayData();
            data.SetValue("appid",PublicConst.Wx_appid);
            data.SetValue("mch_id",PublicConst.Wx_wchid);
            // data.SetValue("device_info", "iphone4s");
            data.SetValue("nonce_str", WxPayApi.GenerateNonceStr());
            data.SetValue("body",product.ProductName);//商品描述
            data.SetValue("out_trade_no", order.OrderNo);//随机字符串
                                                             // data.SetValue("total_fee", Convert.ToInt32(order.OrderTotal * 100));//总金额
            data.SetValue("total_fee",Convert.ToInt32(order.OrderAmount*100));//总金额
            data.SetValue("spbill_create_ip", ip);//总金额
            data.SetValue("time_start", DateTime.Now.ToString("yyyyMMddHHmmss"));//交易起始时间
            data.SetValue("time_expire", DateTime.Now.AddMinutes(30).ToString("yyyyMMddHHmmss"));//交易结束时间
            data.SetValue("notify_url", url);//这里输入通知地址
            data.SetValue("trade_type", "NATIVE");//交易类型
            data.SetValue("product_id", product.ProductCode.ToString());//商品ID  
            data.SetValue("sign", data.MakeSign());//签名
            //Logger.Info("获得签名" + data.GetValue("sign"));

            WxPayData result = WxPayApi.UnifiedOrder(data);//调用统一下单接口
            //Logger.Info(result.ToJson());
            string url = result.GetValue("code_url").ToString();//获得统一下单接口返回的二维码链接
            //Logger.Info("pay url:" + url);
            return url;
        }
　　　　 //  二维码的显示页面
        public ActionResult Payment(string orderno,string ip)
        {
            if (string.IsNullOrEmpty(orderno))
                throw new ArgumentException("guide");

            var order = _order.QueryFirstOrDefault(c => c.OrderNo == orderno);
            NativePay nativePay = new NativePay();
            string url2 = this.GetPayUrl(order,ip);
            ViewBag.QRCode = "/Common/MakeQRCode?data=" + HttpUtility.UrlEncode(url2);
            ViewBag.Order = order;

            return View(order);
        }
　　　　//  生成二维码图片
        public FileResult MakeQRCode(string data)
        {
            //初始化二维码生成工具
            QRCodeEncoder qrCodeEncoder = new QRCodeEncoder();
            qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;
            qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M;
            qrCodeEncoder.QRCodeVersion = 0;
            qrCodeEncoder.QRCodeScale = 4;

            //将字符串生成二维码图片
            Bitmap image = qrCodeEncoder.Encode(data, Encoding.Default);

            //保存为PNG到内存流  
            MemoryStream ms = new MemoryStream();
            image.Save(ms, ImageFormat.Jpeg);            

            return File(ms.ToArray(), "image/jpeg");
        }
        // 回调处理函数
        public ActionResult WxNotify()
        {
            
            //接收从微信后台POST过来的数据
            Stream s = Request.InputStream;
            int count = 0;
            byte[] buffer = new byte[1024];
            StringBuilder builder = new StringBuilder();
            while ((count = s.Read(buffer, 0, 1024)) > 0)
            {
                builder.Append(Encoding.UTF8.GetString(buffer, 0, count));
            }
            s.Flush();
            s.Close();
            s.Dispose();
            //转换数据格式并验证签名
            WxPayData data = new WxPayData();
            try
            {
                Log.Info(this.GetType().ToString(), builder.ToString());
                data.FromXml(builder.ToString());
                if (data.GetValue("result_code").ToString() == "SUCCESS")
                {
                    var tno = data.GetValue("out_trade_no").ToString();  //订单号
                    var order = _order.QueryFirstOrDefault(c => c.OrderNo == tno); //根据订单号获取系统订单信息
                    if (order != null && order.Status == (int)OrderStatus.WaitPay)
                    {
                        //这里加入自己的处理逻辑
                    }
                }
                Log.Info("返回结果：",data.ToJsonString());
            }
            catch (WxPayException ex)
            {
                //若签名错误，则立即返回结果给微信支付后台
                WxPayData res = new WxPayData();
                res.SetValue("return_code", "FAIL");
                res.SetValue("return_msg", ex.Message);
                Log.Error(this.GetType().ToString(), "Sign check error : " + res.ToXml());
                Response.Write(res.ToXml());
                Response.End();
            }
            ProcessNotify(data);

            return View();
        }
        public void ProcessNotify(WxPayData data)
        {
            WxPayData notifyData = data;

            //检查支付结果中transaction_id是否存在
            if (!notifyData.IsSet("transaction_id"))
            {
                //若transaction_id不存在，则立即返回结果给微信支付后台
                WxPayData res = new WxPayData();
                res.SetValue("return_code", "FAIL");
                res.SetValue("return_msg", "支付结果中微信订单号不存在");
                Response.Write(res.ToXml());
                Response.End();
            }

            string transaction_id = no
　　　　}

 　　3.2、页面代码

　　　　支付结果通知页面 WxNotify.cshtml

@{
    ViewBag.Title = "微信扫码支付结果";
}

<div>
    <div>
        <h1>订单支付成功！</h1>
    </div>
</div>

 　　　　支付页面   Payment.cshtml

@model OrdersDto
@{
    ViewBag.Title = "微信扫码支付";
    Layout = "~/Views/Shared/_OrderLayout.cshtml";
}
<div class="">
        <div class="">
            <img src="@ViewBag.QRCode" style="200px;height:200px" />
            <h1>请微信扫描二维码进行支付！</h1>
        </div>
    <div class="">
        <h1>订单号：@Model.OrderNo</h1>
        <h2>应付金额<span>@Model.OrderAmount</span>元</h2>
        <a href="" class="dtjcg_zf">付款完成</a>
    </div>
    
</div>