/// <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>