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：
     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>

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