微信公众号支付（MVC版本）

一、获取微信支付 MCHID,KEY,APPID,APPSecret 四个支付关键值.
微信支付商户平台 https://pay.weixin.qq.com/index.php/core/home/login?return_url=%2F
  　 1.登录微信支付商户平台获取到商户号(MCHID),
  　 2.在"账号中心"栏目下"API安全"栏目里设置API密钥(KEY)

微信公众号： https://mp.weixin.qq.com/
     1.登录微信公众在"基本配置"栏获取应用ID(APPID)和应用密钥(APPSecret)
     2.在"接口权限"栏目下"网页账号"绑定正式支付的域名 (如:××××.net,不要http:和"/"斜杠)
     3.在"微信支付"栏目下"开发配置"里面设置公众支付的支付授权目录(如:××××.net/WeChatWeb/) 

二、把WxPayAPI添加到制作项目中,在Config.cs文件里修改获取到的MCHID,KEY,APPID,APPSecret四个关键值以及NOTIFY_URL值(NOTIFY_URL是支付授权目录),并在MVC项目里建一个WeChatWeb控制器,里面加上逻辑代码.并传递微信jsapi支付所需的参数.代码示例如下:

后台Action代码

  /// <summary>  /// 获取微信支付相关信息  /// </summary>  /// <returns></returns>  [HttpGet]  public virtual ActionResult Index()  {   JsApiPay jsApiPay = new JsApiPay();   OStudent model = null;   try   {    //调用【网页授权获取用户信息】接口获取用户的openid和access_token    jsApiPay.GetOpenidAndAccessToken();    //获取微信支付者公共id    jsApiPay.openid = jsApiPay.openid;    string ID = Request["ID"]; //如果要获取页面传递过来的值,需修改GetOpenidAndAccessToken()方法里面的代码,加上Request.Url.Query获取参数    model = OStudentSiteService.GetByKey(id).AppendData as OStudent;    if (model != null)    {     jsApiPay.total_fee = 1;//测试 订单金额(1表示分,正式金额要*100)     jsApiPay.Order_ID = model.order_ID; //订单号(自己定义订单号)         }    //JSAPI支付预处理    //调用统一下单，获得下单结果    WxPayData unifiedOrderResult = jsApiPay.GetUnifiedOrderResult();    //从统一下单成功返回的数据中获取微信浏览器调起jsapi支付所需的参数    var wxJsApiParam = jsApiPay.GetJsApiParameters(); //获取到的是json格式字符串    ViewBag.wxJsApiParam = wxJsApiParam; //前台页面js调用    Log.Debug(this.GetType().ToString(), "wxJsApiParam : " + wxJsApiParam);   }   catch (Exception ex)   {    Response.Write(ex.Message + "," + ex.Source);    Response.End();   }   return View(model);  }    //修改支付方式  [HttpPost]  public virtual JsonResult PayMethod()  {   AjaxJsonResult ajax = new AjaxJsonResult() { err = true, msg = string.Empty, timeout = 3 };   string id = Request.Form["id"];   string payMethod = Request.Form["payMethod"];   var model = (Project.Core.Models.Model.OStudent)OStudentSiteService.GetByKey(id).AppendData;   model.payMethod = payMethod; //支付方式   OperationResult result = OStudentSiteService.Modify(model);   if (result.ResultType == OperationResultType.Success)   {    ajax.err = false;    ajax.msg = "操作成功";   }   return Json(ajax);  }  /// <summary>  /// 修改支付状态  /// </summary>  /// <param name="userID"></param>  /// <returns></returns>  [HttpPost]  public virtual string EditPayStatus(Guid userID)  {   string msg = "error";   var model = OStudentSiteService.GetByKey(userID).AppendData as OStudent;   model.Status = (int)X.Project.Site.Models.Enum.PayStatus.Success; //付款成功   OperationResult result = OStudentSiteService.Modify(model);   if (result.ResultType == OperationResultType.Success)   {    msg = "ok";       }   return msg;  }    前台Index.chtml视图页面JS代码   <script type="text/javascript">  var _wxJsApiParam = eval('(@Html.Raw(ViewBag.wxJsApiParam))');  function callpay() {   //选择支付方式   var payMethod = $("input[name='PayMethod']:checked").val();   if (payMethod == "" || payMethod == null) {    layer.msg("请选择支付方式", function () { })    return false;   }   $.ajax({    type: "POST",    dataType: "JSON",    url: '@Url.Action("PayMethod", "WeChatWeb")',    data: {     payMethod: payMethod,     id: '@Model.ID'    },    success: function (data) {     //表示修改支付方式成功     if (!data.err) {      //1表示微信支付,则调用微信支付      if (payMethod == "1") {       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();       }      } else if (payMethod == "2") {       layer.alert('恭喜您,操作成功!', function () {         window.location.href = "@Url.Action(MVC.Default.Index())" ; //操作成功后的跳转页面       });      }    } else {     layer.msg("操作失败", function () { })     return false;    }    }   }); } //调用微信JS api 支付 function jsApiCall() {  WeixinJSBridge.invoke('getBrandWCPayRequest', _wxJsApiParam,    function (res) {     if (res.err_msg == "get_brand_wcpay_request:cancel") {       layer.msg("已取消支付", function () { });      return false;     } else if (res.err_msg == "get_brand_wcpay_request:ok") {      //支付成功      //ajax      $.ajax({       type: "POST",       dataType: "text",       url: '@Url.Action("EditPayStatus", "WeChatWeb")',       data: {        userID: '@Model.ID'       },       error: function (request) {         layer.msg("服务器错误！", function () { });        return false;       },       success: function (data) {        window.location.href = "@Url.Action(MVC.Default.Index())"; //支付成功后跳转的页面       }      }); //ajax end      }    });   }  </script>