.net mvc 微信支付

一、微信第三方登录
通过微信打开链接:http://www.hzm.com/Entry/Login
微信OAuth2.0授权登录目前支持authorization_code模式，适用于拥有server端的应用授权。该模式整体流程为：
　　1. 第三方发起微信授权登录请求，微信用户允许授权第三方应用后，微信会拉起应用或重定向到第三方网站，并且带上授权临时票据code参数；

　　2. 通过code参数加上AppID和AppSecret等，通过API换取access_token；

　　3. 通过access_token进行接口调用，获取用户基本数据资源或帮助用户实现基本操作。
1.控制器中代码
public ActionResult Login()
{
    //若已经登录，直接跳到首页
    if (HttpContext.User.Identity.IsAuthenticated)
    {
        return RedirectToAction("Index", "Entry");
    }
    //微信登录
    //1.获取code
    if (string.IsNullOrEmpty(Request.QueryString["code"]))
    {
        //从定向到微信，微信再重定向到当前函数(进入第1步获取code)
        return RedirectToWeixin();
    }
    //2.获取openID
    //通过code获取openID
    string openID = "";
    try
    {
         openID = GetOpenID(Request.QueryString["code"]);
    }
    catch(Exception e)
    {
        Log.Debug("GetOpenID Exception", e.StackTrace);
        return Redirect("/Entry/Login");
    }
    //3.查找或存储用户信息
    User user = new User();
    user = db.Users.SingleOrDefault(p => p.OpenID == openID);
    if (user == null)
    {
        //添加用户
        user = new User();
        user.OpenID = openID;
        db.Users.Add(user);
        db.SaveChanges();
    }
    //登录成功
    FormsAuthentication.SetAuthCookie(user.ID.ToString(), false);//记录登录凭证
    return RedirectToAction("Index", "Entry");
}
1.1.获取code
 private ActionResult RedirectToWeixin()
{
    JsApiPay jsApiPay = new JsApiPay(this);
    var redirect_url = jsApiPay.GetRedirectToWeixinUrlForCode();//将回调stata参数值设为awardUserID
    return Redirect(redirect_url);//调回:/Entry/Login
}
1.2.通过code获取openID和access_token
private string GetOpenID(string code)
{
    JsApiPay jsApiPay = new JsApiPay(this);
    //如果code有值
    if (!string.IsNullOrEmpty(code))
    {
        Log.Debug(" GetOpenID code", code);
        //去获取OpenID
        jsApiPay.GetOpenidAndAccessTokenFromCode(code);
    }
    Log.Debug("GetOpenidAndAccessTokenFromCode openid", jsApiPay.openid.ToString());
    return jsApiPay.openid.ToString();
}
二、微信支付
2.1.生成业务订单和微信交易号Out_trade_no
public ActionResult CreateOrder(int entryID, PayMode payMode)
{
    //一个报名只应对应一个订单
    //判断订单是否已经存在,则直接进入详情页
    if (db.Orders.Any(p => p.EntryID == entryID))
    {
        return Redirect("/Entry/Detail?out_trade_no=" + db.Orders.SingleOrDefault(p => p.EntryID == entryID).Out_trade_no);
    }
    Entry entry = db.Entrys.Include("Event").SingleOrDefault(p => p.ID == entryID);
    Order order = new Order();
    order.EntryID = entry.ID;
    order.Amount = GetDiscount(entry.Event);
    order.PayMode = payMode;
    order.State = OrderSatet.Unpaid;
    order.SubmitTime = DateTime.Now;
    order.Body = entry.Event.Theme;
    order.Out_trade_no = WxPayApi.GenerateOutTradeNo();
    db.Orders.Add(order);
    db.SaveChanges();
    if (payMode == PayMode.Remittance)
    {
        return RedirectToAction("Detail", new { out_trade_no = order.Out_trade_no });
    }
    return RedirectToAction("Pay", new { orderID = order.ID });
}
2.2.微信支付
public ActionResult Pay(int orderID)
{
    //获取订单
    Order order = db.Orders.SingleOrDefault(p => p.ID == orderID);

    //修改支付方式
    order.PayMode = PayMode.Weixin;
    db.SaveChanges();

    //微信openID
    Entry entry = db.Entrys.Include("Event").SingleOrDefault(p => p.ID == order.EntryID);
    User user = db.Users.SingleOrDefault(p => p.ID == entry.UserID);
    Log.Debug("openID", user.OpenID);
    Log.Debug("entry.UserID", entry.UserID.ToString());
    Log.Debug("HttpContext.User.Identity.Name", HttpContext.User.Identity.Name);
    //当前订单的商户系统的订单号
    ViewData["out_trade_no"] = order.Out_trade_no;
    //支付费用
    decimal totalFee = GetDiscount(entry.Event);
    Log.Debug("totalFee", "100.00");
    JsApiPay jsApiPay = new JsApiPay(this);
    try
    {
        //若传递了相关参数，则调统一下单接口，获得后续相关接口的入口参数
        jsApiPay.openid = user.OpenID;

        jsApiPay.total_fee =  Convert.ToInt32(totalFee * 100);//支持两位小数，如0.01
        Log.Debug(this.GetType().ToString(), "参数赋值成功1");
        //JSAPI支付预处理
        Log.Debug(this.GetType().ToString(), "参数赋值成功2");
        WxPayData unifiedOrderResult = jsApiPay.GetUnifiedOrderResult(entry.Name + "的" + entry.Event.Theme, "报名", order.Out_trade_no);

        Log.Debug(this.GetType().ToString(), "预支付订单生成成功");
        //获取H5调起JS API参数  
        var wxJsApiParam = jsApiPay.GetJsApiParameters();
        ViewData["wxJsApiParam"] = wxJsApiParam;

        Log.Debug(this.GetType().ToString(), "wxJsApiParam参数获取成功");
        //预支付订单号
        var prepay_id = jsApiPay.unifiedOrderResult.GetValue("prepay_id").ToString();
        ViewData["prepay_id"] = prepay_id;
        Log.Debug(this.GetType().ToString(), "prepay_id参数获取成功");
        /*###################################*/
        Log.Debug(this.GetType().ToString(), "wxJsApiParam : " + wxJsApiParam);
    }
    catch (Exception ex)
    {
        Response.Write("<span style='color:#FF0000;font-size:20px'>" + "下单失败，请返回重试" + "</span>");
        Log.Debug("Award-ConfirmPayPage", ex.Message + ex.StackTrace);
        Log.Debug("Award-ConfirmPayPage", "预支付订单生成或保存异常");
    }

    return View();

}
2.3.页面中调起微信支付接口(Pay.html)
@{
    Layout = null;
}
<!DOCTYPE html>
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>支付页面</title>
    <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no">
    <script type="text/javascript">
        var wxJsApiParam=@Html.Raw(ViewData["wxJsApiParam"].ToString());
    //调用微信JS api 支付

    function jsApiCall() {
        WeixinJSBridge.invoke(
                'getBrandWCPayRequest',
                wxJsApiParam,
                function (res)
                {
                    WeixinJSBridge.log(res.err_msg);

                    //alert(res.err_code + res.err_desc + res.err_msg);

                    if(res.err_msg=="get_brand_wcpay_request:ok"){
                        location.href ="/Entry/Detail?out_trade_no=@ViewData["out_trade_no"]";
                    }else
                    {
                        location.href ="/Entry/Detail?out_trade_no=@ViewData["out_trade_no"]";
                    }
                        
                        //alert(res.err_msg);
                     }
                );
        }

        function callpay()
        {
            if (typeof WeixinJSBridge == "undefined")
            {
                if (document.addEventListener)
                {
                    document.addEventListener('WeixinJSBridgeReady', jsApiCall, false);
                }
                else if (document.attachEvent)
                {
                    document.attachEvent('WeixinJSBridgeReady', jsApiCall);
                    document.attachEvent('onWeixinJSBridgeReady', jsApiCall);
                }
            }
            else
            {
                jsApiCall();
            }
        }
        callpay();
    </script>
</head>
<body>        
</body>
</html>
2.4.支付成功后微信发送支付成功异步通知(post方式，通知地址在Config.cs中配置的NOTIFY_URL，在这里添加订单处理业务逻辑)
public ActionResult Notify()
{
    ResultNotify notify = new ResultNotify(this);
    WxPayData data = notify.GetNotifyData();
    Log.Debug("return_code", data.GetValue("return_code").ToString());
    Log.Debug("return_msg", data.GetValue("return_code").ToString());
    if (data.GetValue("return_code").ToString() == "SUCCESS")
    {
        Log.Debug("out_trade_no", data.GetValue("out_trade_no").ToString());
        var out_trade_no = data.GetValue("out_trade_no").ToString();

        Order order = db.Orders.SingleOrDefault(p => p.Out_trade_no == out_trade_no);
        Log.Debug("orderID", order.ID.ToString());

        order.State = OrderSatet.Paid;
        var time_end = data.GetValue("time_end").ToString();
        order.PayTime = DateTime.ParseExact(time_end, "yyyyMMddHHmmss", CultureInfo.CurrentCulture);
        order.TransactionID = data.GetValue("transaction_id").ToString();
        order.OpenID = data.GetValue("openid").ToString();
        db.SaveChanges();

    }
    notify.ProcessNotify();

    return View();
}
2.5.支付成功后跳转到(Pay.html页面设置的地址)
如:location.href ="/Entry/Detail?out_trade_no=@ViewData["out_trade_no"]";
微信支付官方文档地址：
1.App微信支付：https://pay.weixin.qq.com/wiki/doc/api/app/app.php?chapter=8_3