C#开发微信门户及应用(32)--微信支付接入和API封装使用

    /// <summary>
    /// 微信支付接口
    /// </summary>
    public interface ITenPayApi
    {      
        /// <summary>
        /// 生成扫描支付模式一URL
        /// </summary>
        /// <param name="productId">商品ID</param>
        /// <returns></returns>
        string GetPrePayUrl(string productId);

        /// <summary>
        /// 生成直接支付url，支付url有效期为2小时,模式二
        /// </summary>
        /// <param name="info">商品订单数据</param>
        /// <returns></returns>
        string GetPayUrl(WxPayOrderData info);

        /// <summary>
        /// 统一下单。（不需要证书,默认不需要）
        /// 除被扫支付场景以外，商户系统先调用该接口在微信支付服务后台生成预支付交易单，
        /// 返回正确的预支付交易回话标识后再按扫码、JSAPI、APP等不同场景生成交易串调起支付。
        /// </summary>
        /// <param name="info">商品订单数据</param>
        WxPayData UnifiedOrder(WxPayOrderData info);

        .............

    /// <summary>
    /// 统一下单的商品订单信息
    /// </summary>
    public class WxPayOrderData
    {
        /// <summary>
        /// 商品ID, trade_type=NATIVE，此参数必传
        /// </summary>
        public string product_id { get; set; }
        /// <summary>
        /// 商品或支付单简要描述
        /// </summary>
        public string body { get; set; }
        /// <summary>
        /// 订单总金额，单位为分
        /// </summary>
        public int total_fee { get; set; }
        /// <summary>
        /// 商品标记，代金券或立减优惠功能的参数，说明详见代金券或立减优惠
        /// </summary>
        public string goods_tag { get; set; }

        /// <summary>
        /// 交易类型,默认为:NATIVE。
        /// JSAPI--公众号支付、NATIVE--原生扫码支付、APP--app支付
        /// </summary>
        public string trade_type { get; set; }

        /// <summary>
        /// 商品名称明细列表
        /// </summary>
        public string detail { get; set; }
        /// <summary>
        /// 附加数据
        /// 在查询API和支付通知中原样返回，该字段主要用于商户携带订单的自定义数据
        /// </summary>
        public string attach { get; set; }
        /// <summary>
        /// 用户标识
        /// trade_type=JSAPI，此参数必传，用户在商户appid下的唯一标识。
        /// </summary>
        public string openid { get; set; }

        public WxPayOrderData()
        {
            this.trade_type = "NATIVE";
        }
    }

    public class WxPayData
    {
        //采用排序的Dictionary的好处是方便对数据包进行签名，不用再签名之前再做一次排序
        private SortedDictionary<string, object> m_values = new SortedDictionary<string, object>();
        
        /// <summary>
        /// 默认构造函数
        /// 如果initDefault为true，则自动填入字段（appid,mch_id,time_stamp,nonce_str,out_trade_no,）
        /// </summary>
        public WxPayData(bool initDefault = false)
        {
            if(initDefault)
            {
                Init();
            }
        }

        /// <summary>
        /// 对象初始化后，自动填入字段（appid,mch_id,time_stamp,nonce_str,out_trade_no,）
        /// </summary>
        public void Init()
        {
            //初始化几个参数
            this.SetValue("appid", WxPayConfig.APPID);//公众帐号id
            this.SetValue("mch_id", WxPayConfig.MCHID);//商户号
            this.SetValue("nonce_str", GenerateNonceStr());//随机字符串
            this.SetValue("out_trade_no", GenerateOutTradeNo(WxPayConfig.MCHID));//随机字符串

        }

        /// <summary>
        /// 统一下单。（不需要证书,默认不需要）
        /// 除被扫支付场景以外，商户系统先调用该接口在微信支付服务后台生成预支付交易单，
        /// 返回正确的预支付交易回话标识后再按扫码、JSAPI、APP等不同场景生成交易串调起支付。
        /// </summary>
        /// <param name="info">商品订单数据</param>
        public WxPayData UnifiedOrder(WxPayOrderData info)
        {
            WxPayData data = new WxPayData(true);
            data.SetValue("product_id", info.product_id);//商品ID
            data.SetValue("openid", info.openid);//商品ID

            //其他信息
            data.SetValue("body", info.body);//商品描述
            data.SetValue("attach", info.attach);//附加数据
            data.SetValue("total_fee", info.total_fee);//总金额
            data.SetValue("goods_tag", info.goods_tag);//商品标记
            data.SetValue("trade_type", info.trade_type);//交易类型

            //默认构建
            data.SetValue("time_start", DateTime.Now.ToString("yyyyMMddHHmmss"));//交易起始时间
            data.SetValue("time_expire", DateTime.Now.AddMinutes(10).ToString("yyyyMMddHHmmss"));//交易结束时间

          ..............

            string url = "https://api.mch.weixin.qq.com/pay/unifiedorder";
            return GetPostResult(data, url);

        /// <summary>
        /// 通用的获取结果函数
        /// </summary>
        private WxPayData GetPostResult(WxPayData data, string url)
        {
            string xml = data.ToXml();
            string response = helper.GetHtml(url, xml, true);

            WxPayData result = new WxPayData();
            result.FromXml(response);
            return result;
        }   

        /// <summary>
        /// 生成直接支付url，支付url有效期为2小时,模式二
        /// </summary>
        /// <param name="info">商品订单数据</param>
        /// <returns></returns>
        public string GetPayUrl(WxPayOrderData info)
        {
            WxPayData result = UnifiedOrder(info);//调用统一下单接口
            return result.GetString("code_url");//获得统一下单接口返回的二维码链接
        }

        private void btnGetPayUrl_Click(object sender, EventArgs e)
        {
            //测试扫码模式二的生成二维码方式
            WxPayOrderData data = new WxPayOrderData()
            {
                product_id = "123456789",
                body = "测试支付-模式二",
                attach = "爱奇迪技术支持",
                detail = "测试扫码支付-模式二",
                total_fee = 1,
                goods_tag = "test1"
            };

            var url = api.GetPayUrl(data);
            var image = api.GenerateQRImage(url);

            this.imgGetPayUrl.Image = image;
            this.imgGetPayUrl.SizeMode = PictureBoxSizeMode.StretchImage;
        }

        /// <summary>
        /// 生成扫描支付模式一URL
        /// </summary>
        /// <param name="productId">商品ID</param>
        /// <returns></returns>
        public string GetPrePayUrl(string productId)
        {
            WxPayData data = new WxPayData(true);
            data.SetValue("product_id", productId);//商品ID     
            data.SetValue("time_stamp", data.GenerateTimeStamp());//随机字符串         
            data.SetValue("sign", data.MakeSign());//签名

            string str = data.ToUrlParams();//转换为URL串
            string url = "weixin://wxpay/bizpayurl?" + str;

            return url;
        }

        private void btnGetPrePayUrl_Click(object sender, EventArgs e)
        {
            var productId = "12345678";
            var url = api.GetPrePayUrl(productId);
            var image = api.GenerateQRImage(url);

            this.imgGetPrePayUrl.Image = image;
            this.imgGetPayUrl.SizeMode = PictureBoxSizeMode.StretchImage;
        }

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <meta http-equiv="content-type" content="text/html;image/gif;charset=utf-8"/>
    <meta name="viewport" content="width=device-width, initial-scale=1" /> 
    <title>微信支付样例-扫码支付</title>
</head>
<body>
    <div style="margin-left: 10px;color:#00CD00;font-size:30px;font-weight: bolder;">扫码支付模式一</div><br/>
    <asp:Image ID="Image1" runat="server" style="width:200px;height:200px;"/>
    <br/><br/><br/>
    <div style="margin-left: 10px;color:#00CD00;font-size:30px;font-weight: bolder;">扫码支付模式二</div><br/>
    <asp:Image ID="Image2" runat="server" style="width:200px;height:200px;"/>
    
</body>
</html>

        protected void Page_Load(object sender, EventArgs e)
        {
            TenPayApi api = new TenPayApi();

            var productId = "123456789";
            //生成扫码支付模式一url
            string url1 = api.GetPrePayUrl(productId);

            //生成扫码支付模式二url
            WxPayOrderData info = new WxPayOrderData()
            {
                product_id = "123456789",
                body = "测试支付-模式二",
                attach = "爱奇迪技术支持",
                detail = "测试扫码支付-模式二",
                total_fee = 1,
                goods_tag = "test1"
            };
            string url2 = api.GetPayUrl(info);

            //将url生成二维码图片
            Image1.ImageUrl = "MakeQRCode.aspx?data=" + HttpUtility.UrlEncode(url1);
            Image2.ImageUrl = "MakeQRCode.aspx?data=" + HttpUtility.UrlEncode(url2);
        }