asp.net微信jsapi支付

1.前台页面：

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no" />
    <title>微信扫码支付</title>
    <style>
        html { font-size:20px; }
        .logo_g { 8.5rem; }
        .form-control { 96%;height:2rem;font-size: 1.5rem;border-radius: 0.25rem;border: 1px solid #ccc; }
        #btnSubmit {  96%; height: 2rem; border-radius: 0.25rem; background-color: #00CD00; border: 0px #FE6714 solid; cursor: pointer; color: white; font-size: 1.5rem;margin-top: 1rem; }
    </style>
    <script type="text/javascript">
        window.onload=function(){
            document.documentElement.style.fontSize=document.documentElement.clientWidth*20/320+'px';
            window.onsize=function(){
                document.documentElement.style.fontSize=document.documentElement.clientWidth*20/320+'px';
            };
        };

        //调用微信JS api 支付
        function jsApiCall()
        {
            WeixinJSBridge.invoke(
            'getBrandWCPayRequest',
            <%=wxJsApiParam%>,//josn串
                    function (res)
                    {
                        if (res.err_msg == "get_brand_wcpay_request:ok") {
                            alert("微信支付成功!");
                        } else if (res.err_msg == "get_brand_wcpay_request:cancel") {
                            alert("用户取消支付!");
                        } else {
                            alert(res.err_msg);
                            alert("支付失败!");
                        }
                    }
                    );
        }

        function callpay()
        {
            //WeixinJSBridge.invoke()
            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();
            }
        }
               
    </script>
</head>
<body>
    <form id="form1" runat="server" style="text-align:center;">
        <img class="logo_g" src="../Templates/vshop/t7/images/logo.png" />
        <asp:TextBox ID="txtMoney" CssClass="form-control" runat="server"  onkeypress="if (event.keyCode < 48 || event.keyCode >57) event.returnValue = false;" placeholder="请输入金额"  />
        <asp:Button ID="btnSubmit" runat="server" Text="立即支付" OnClientClick="callpay()" />
    </form>
</body>
</html>

2.后台代码

public class wx_ScanCodePay : Page
    {
        protected Button btnSubmit;
        protected TextBox txtMoney;

        public static string wxEditAddrParam { get; set; }
        public static string wxJsApiParam { get; set; } //H5调起JS API参数

        protected void Page_Load(object sender, EventArgs e)
        {
            this.btnSubmit.Click += new EventHandler(this.btnSubmit_Click);
            if (!IsPostBack)
            {
                //JsApiPay jsApiPay = new JsApiPay(this);
                //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();

                //    //获取收货地址js函数入口参数
                //    wxEditAddrParam = jsApiPay.GetEditAddressParameters();
                //    ViewState["openid"] = jsApiPay.openid;
                //}
                //catch (Exception ex)
                //{
                //    Response.Write("<span style='color:#FF0000;font-size:20px'>" + "页面加载出错，请重试" + "</span>");
                //}
            }
        }

        private void btnSubmit_Click(object sender, EventArgs e)
        {
            string amount = this.txtMoney.Text;
            int money;
            if (ViewState["openid"] != null)
            {
                string openid = ViewState["openid"].ToString();

                //检测是否给当前页面传递了相关参数
                if (string.IsNullOrEmpty(amount))
                {
                    Response.Write("<span style='color:#FF0000;font-size:20px'>" + "请输入正确的金额,请返回重试" + "</span>");
                    return;
                }
                if (!int.TryParse(amount, out money))
                {
                    Response.Write("<span style='color:#FF0000;font-size:20px'>" + "请输入正确的金额,请返回重试" + "</span>");
                    return;
                }

                //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 jsApiPay = new JsApiPay(this);
                jsApiPay.openid = openid;
                jsApiPay.total_fee = (int)(money * 100M);

                //JSAPI支付预处理
                try
                {
                    WxPayData unifiedOrderResult = jsApiPay.GetUnifiedOrderResult();
                    wxJsApiParam = jsApiPay.GetJsApiParameters();//获取H5调起JS API参数           
                }
                catch (Exception ex)
                {
                    Response.Write("<span style='color:#FF0000;font-size:20px'>" + "下单失败，请返回重试" + "</span>");

                }
            }
            else
            {
                Response.Write("<span style='color:#FF0000;font-size:20px'>" + "页面缺少参数，请返回重试" + "</span>");
            
            }
        }
    }

3.JsApiPay.cs

namespace WxPayAPI
{
    public class JsApiPay
    {
        /// <summary>
        /// 保存页面对象，因为要在类的方法中使用Page的Request对象
        /// </summary>
        private Page page {get;set;}

        /// <summary>
        /// openid用于调用统一下单接口
        /// </summary>
        public string openid { get; set; }

        /// <summary>
        /// access_token用于获取收货地址js函数入口参数
        /// </summary>
        public string access_token { get; set; }

        /// <summary>
        /// 商品金额，用于统一下单
        /// </summary>
        public int total_fee { get; set; }

        /// <summary>
        /// 统一下单接口返回结果
        /// </summary>
        public WxPayData unifiedOrderResult { get; set; } 

        public JsApiPay(Page page)
        {
            this.page = page;
        }


        /**
        * 
        * 网页授权获取用户基本信息的全部过程
        * 详情请参看网页授权获取用户基本信息：http://mp.weixin.qq.com/wiki/17/c0f37d5704f0b64713d5d2c37b468d75.html
        * 第一步：利用url跳转获取code
        * 第二步：利用code去获取openid和access_token
        * 
        */

        public  SiteSettings masterSettings = SettingsManager.GetMasterSettings(false);

        public void GetOpenidAndAccessToken()
        {
            if (!string.IsNullOrEmpty(page.Request.QueryString["code"]))
            {
                //获取code码，以获取openid和access_token
                string code = page.Request.QueryString["code"];
               // Log.Debug(this.GetType().ToString(), "Get code : " + code);
                GetOpenidAndAccessTokenFromCode(code);
            }
            else
            {
                //构造网页授权获取code的URL
                string host = page.Request.Url.Host;
                string path = page.Request.Path;
                string redirect_uri = HttpUtility.UrlEncode("http://" + host + path);
                WxPayData data = new WxPayData();
                data.SetValue("appid", masterSettings.WeixinAppId);
                data.SetValue("redirect_uri", redirect_uri);
                data.SetValue("response_type", "code");
                data.SetValue("scope", "snsapi_base");
                data.SetValue("state", "STATE" + "#wechat_redirect");
                string url = "https://open.weixin.qq.com/connect/oauth2/authorize?" + data.ToUrl();
               // Log.Debug(this.GetType().ToString(), "Will Redirect to URL : " + url);
                try
                {
                    //触发微信返回code码         
                    page.Response.Redirect(url);//Redirect函数会抛出ThreadAbortException异常，不用处理这个异常
                }
                catch(System.Threading.ThreadAbortException ex)
                {
                }
            }
        }


        /**
        * 
        * 通过code换取网页授权access_token和openid的返回数据，正确时返回的JSON数据包如下：
        * {
        *  "access_token":"ACCESS_TOKEN",
        *  "expires_in":7200,
        *  "refresh_token":"REFRESH_TOKEN",
        *  "openid":"OPENID",
        *  "scope":"SCOPE",
        *  "unionid": "o6_bmasdasdsad6_2sgVt7hMZOPfL"
        * }
        * 其中access_token可用于获取共享收货地址
        * openid是微信支付jsapi支付接口统一下单时必须的参数
        * 更详细的说明请参考网页授权获取用户基本信息：http://mp.weixin.qq.com/wiki/17/c0f37d5704f0b64713d5d2c37b468d75.html
        * @失败时抛异常WxPayException
        */
        public void GetOpenidAndAccessTokenFromCode(string code)
        {
            try
            {
                //构造获取openid及access_token的url
                WxPayData data = new WxPayData();
                data.SetValue("appid", masterSettings.WeixinAppId);
                data.SetValue("secret", masterSettings.WeixinAppSecret);
                data.SetValue("code", code);
                data.SetValue("grant_type", "authorization_code");
                string url = "https://api.weixin.qq.com/sns/oauth2/access_token?" + data.ToUrl();

                //请求url以获取数据
                string result = HttpService.Get(url);

              //  Log.Debug(this.GetType().ToString(), "GetOpenidAndAccessTokenFromCode response : " + result);

                //保存access_token，用于收货地址获取
                JsonData jd = JsonMapper.ToObject(result);
                access_token = (string)jd["access_token"];

                //获取用户openid
                openid = (string)jd["openid"];

              //  Log.Debug(this.GetType().ToString(), "Get openid : " + openid);
             //   Log.Debug(this.GetType().ToString(), "Get access_token : " + access_token);
            }
            catch (Exception ex)
            {
               // Log.Error(this.GetType().ToString(), ex.ToString());
                throw new WxPayException(ex.ToString());
            }
        }

        /**
         * 调用统一下单，获得下单结果
         * @return 统一下单结果
         * @失败时抛异常WxPayException
         */
        public WxPayData GetUnifiedOrderResult()
        {
            //统一下单
            WxPayData data = new WxPayData();
            data.SetValue("body", "test");//商品描述
            data.SetValue("attach", "test");//附加数据
            data.SetValue("out_trade_no", WxPayApi.GenerateOutTradeNo());
            data.SetValue("total_fee", total_fee);
            data.SetValue("time_start", DateTime.Now.ToString("yyyyMMddHHmmss"));
            data.SetValue("time_expire", DateTime.Now.AddMinutes(10).ToString("yyyyMMddHHmmss"));
            data.SetValue("goods_tag", "test");//商品标记(优惠券可能用到)
            data.SetValue("trade_type", "JSAPI");
            data.SetValue("openid", openid);

            WxPayData result = WxPayApi.UnifiedOrder(data);
            if (!result.IsSet("appid") || !result.IsSet("prepay_id") || result.GetValue("prepay_id").ToString() == "")
            {
            //    Log.Error(this.GetType().ToString(), "UnifiedOrder response error!");
                throw new WxPayException("UnifiedOrder response error!");
            }

            unifiedOrderResult = result;
            return result;
        }

        /**
        *  
        * 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，
        * 微信浏览器调起JSAPI时的输入参数格式如下：
        * {
        *   "appId" : "wx2421b1c4370ec43b",     //公众号名称，由商户传入     
        *   "timeStamp":" 1395712654",         //时间戳，自1970年以来的秒数     
        *   "nonceStr" : "e61463f8efa94090b1f366cccfbbb444", //随机串     
        *   "package" : "prepay_id=u802345jgfjsdfgsdg888",     
        *   "signType" : "MD5",         //微信签名方式:    
        *   "paySign" : "70EA570631E4BB79628FBCA90534C63FF7FADD89" //微信签名 
        * }
        * @return string 微信浏览器调起JSAPI时的输入参数，json格式可以直接做参数用
        * 更详细的说明请参考网页端调起支付API：http://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=7_7
        * 
        */
        public string GetJsApiParameters()
        {
           // Log.Debug(this.GetType().ToString(), "JsApiPay::GetJsApiParam is processing...");

            WxPayData jsApiParam = new WxPayData();
            jsApiParam.SetValue("appId", unifiedOrderResult.GetValue("appid"));
            jsApiParam.SetValue("timeStamp", WxPayApi.GenerateTimeStamp());
            jsApiParam.SetValue("nonceStr", WxPayApi.GenerateNonceStr());
            jsApiParam.SetValue("package", "prepay_id=" + unifiedOrderResult.GetValue("prepay_id"));
            jsApiParam.SetValue("signType", "MD5");
            jsApiParam.SetValue("paySign", jsApiParam.MakeSign());

            string parameters = jsApiParam.ToJson();

          //  Log.Debug(this.GetType().ToString(), "Get jsApiParam : " + parameters);
            return parameters;
        }


        /**
        * 
        * 获取收货地址js函数入口参数,详情请参考收货地址共享接口：http://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=7_9
        * @return string 共享收货地址js函数需要的参数，json格式可以直接做参数使用
        */
        public string GetEditAddressParameters()
        {
            string parameter = "";
            try
            {
                string host = page.Request.Url.Host;
                string path = page.Request.Path;
                string queryString = page.Request.Url.Query;
                //这个地方要注意，参与签名的是网页授权获取用户信息时微信后台回传的完整url
                string url = "http://" + host + path + queryString;

                //构造需要用SHA1算法加密的数据
                WxPayData signData = new WxPayData();
                signData.SetValue("appid", masterSettings.WeixinAppId);
                signData.SetValue("url", url);
                signData.SetValue("timestamp",WxPayApi.GenerateTimeStamp());
                signData.SetValue("noncestr",WxPayApi.GenerateNonceStr());
                signData.SetValue("accesstoken",access_token);
                string param = signData.ToUrl();

              //  Log.Debug(this.GetType().ToString(), "SHA1 encrypt param : " + param);
                //SHA1加密
                string addrSign = FormsAuthentication.HashPasswordForStoringInConfigFile(param, "SHA1");
             //   Log.Debug(this.GetType().ToString(), "SHA1 encrypt result : " + addrSign);

                //获取收货地址js函数入口参数
                WxPayData afterData = new WxPayData();
                afterData.SetValue("appId", masterSettings.WeixinAppId);
                afterData.SetValue("scope","jsapi_address");
                afterData.SetValue("signType","sha1");
                afterData.SetValue("addrSign",addrSign);
                afterData.SetValue("timeStamp",signData.GetValue("timestamp"));
                afterData.SetValue("nonceStr",signData.GetValue("noncestr"));

                //转为json格式
                parameter = afterData.ToJson();
              //  Log.Debug(this.GetType().ToString(), "Get EditAddressParam : " + parameter);
            }
            catch (Exception ex)
            {
              //  Log.Error(this.GetType().ToString(), ex.ToString());
                throw new WxPayException(ex.ToString());
            }

            return parameter;
        }
    }
}

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原文地址：https://www.cnblogs.com/dushaojun/p/5500297.html