微信公众号发起微信支付 c#

tenpay.dll：

MD5Util.cs

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Security.Cryptography;namespace tenpay{    public class MD5Util    {        public MD5Util()        {            //            // TODO: 在此处添加构造函数逻辑            //        }        /** 获取大写的MD5签名结果 */        public static string GetMD5(string encypStr, string charset)        {            string retStr;            MD5CryptoServiceProvider m5 = new MD5CryptoServiceProvider();            //创建md5对象            byte[] inputBye;            byte[] outputBye;            //使用GB2312编码方式把字符串转化为字节数组．            try            {                inputBye = Encoding.GetEncoding(charset).GetBytes(encypStr);            }            catch (Exception ex)            {                inputBye = Encoding.GetEncoding("GB2312").GetBytes(encypStr);            }            outputBye = m5.ComputeHash(inputBye);            retStr = System.BitConverter.ToString(outputBye);            retStr = retStr.Replace("-", "").ToUpper();            return retStr;        }    }}

OrderDetail.cs

using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace tenpay{    /// <summary>    /// 微信订单明细实体对象    /// </summary>    [Serializable]    public class OrderDetail    {        /// <summary>        /// 返回状态码，SUCCESS/FAIL 此字段是通信标识，非交易标识，交易是否成功需要查看trade_state来判断        /// </summary>        public string return_code = "";        /// <summary>        /// 返回信息返回信息，如非空，为错误原因 签名失败 参数格式校验错误        /// </summary>        public string return_msg = "";        /// <summary>        /// 公共号ID(微信分配的公众账号 ID)        /// </summary>        public string appid = "";        /// <summary>        /// 商户号(微信支付分配的商户号)        /// </summary>        public string mch_id = "";        /// <summary>        /// 随机字符串，不长于32位        /// </summary>        public string nonce_str = "";        /// <summary>        /// 签名        /// </summary>        public string sign = "";        /// <summary>        /// 业务结果,SUCCESS/FAIL        /// </summary>        public string result_code = "";        /// <summary>        /// 错误代码        /// </summary>        public string err_code = "";        /// <summary>        /// 错误代码描述        /// </summary>        public string err_code_des = "";        /// <summary>        /// 交易状态        ///SUCCESS—支付成功        ///REFUND—转入退款        ///NOTPAY—未支付        ///CLOSED—已关闭        ///REVOKED—已撤销        ///USERPAYING--用户支付中        ///NOPAY--未支付(输入密码或确认支付超时) PAYERROR--支付失败(其他原因，如银行返回失败)        /// </summary>        public string trade_state = "";        /// <summary>        /// 微信支付分配的终端设备号        /// </summary>        public string device_info = "";        /// <summary>        /// 用户在商户appid下的唯一标识        /// </summary>        public string openid = "";               /// <summary>        /// 用户是否关注公众账号，Y-关注，N-未关注，仅在公众账号类型支付有效        /// </summary>        public string is_subscribe = "";        /// <summary>        /// 交易类型,JSAPI、NATIVE、MICROPAY、APP        /// </summary>        public string trade_type = "";        /// <summary>        /// 银行类型，采用字符串类型的银行标识        /// </summary>        public string bank_type = "";        /// <summary>        /// 订单总金额，单位为分        /// </summary>        public string total_fee = "";        /// <summary>        /// 现金券支付金额<=订单总金额，订单总金额-现金券金额为现金支付金额        /// </summary>        public string coupon_fee = "";        /// <summary>        /// 货币类型，符合ISO 4217标准的三位字母代码，默认人民币：CNY        /// </summary>        public string fee_type = "";        /// <summary>        /// 微信支付订单号        /// </summary>        public string transaction_id = "";        /// <summary>        /// 商户系统的订单号，与请求一致。        /// </summary>        public string out_trade_no = "";        /// <summary>        /// 商家数据包，原样返回        /// </summary>        public string attach = "";        /// <summary>        /// 支付完成时间，格式为yyyyMMddhhmmss，如2009年12月27日9点10分10秒表示为20091227091010。        /// 时区为GMT+8 beijing。该时间取自微信支付服务器        /// </summary>        public string time_end = "";    }}

QueryOrder.cs

using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace tenpay{    /// <summary>    /// 微信订单查询接口请求实体对象    /// </summary>    [Serializable]    public class QueryOrder    {        /// <summary>        /// 公共号ID(微信分配的公众账号 ID)        /// </summary>        public string appid = "";        /// <summary>        /// 商户号(微信支付分配的商户号)        /// </summary>        public string mch_id = "";        /// <summary>        /// 微信订单号，优先使用        /// </summary>        public string transaction_id = "";        /// <summary>        /// 商户系统内部订单号        /// </summary>        public string out_trade_no = "";        /// <summary>        /// 随机字符串，不长于 32 位        /// </summary>        public string nonce_str = "";        /// <summary>        /// 签名，参与签名参数：appid，mch_id，transaction_id，out_trade_no，nonce_str，key        /// </summary>        public string sign = "";    }}

UnifiedOrder.cs

using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace tenpay{    /// <summary>    /// 微信统一接口请求实体对象    /// </summary>    [Serializable]    public class UnifiedOrder    {        /// <summary>        /// 公共号ID(微信分配的公众账号 ID)        /// </summary>        public string appid = "";        /// <summary>        /// 商户号(微信支付分配的商户号)        /// </summary>        public string mch_id = "";        /// <summary>        /// 微信支付分配的终端设备号        /// </summary>        public string device_info = "";        /// <summary>        /// 随机字符串，不长于 32 位        /// </summary>        public string nonce_str = "";        /// <summary>        /// 签名        /// </summary>        public string sign = "";        /// <summary>        /// 商品描述        /// </summary>        public string body = "";        /// <summary>        /// 附加数据，原样返回        /// </summary>        public string attach = "";        /// <summary>        /// 商户系统内部的订单号,32个字符内、可包含字母,确保在商户系统唯一,详细说明        /// </summary>        public string out_trade_no = "";        /// <summary>        /// 订单总金额，单位为分，不能带小数点        /// </summary>        public int total_fee = 0;        /// <summary>        /// 终端IP        /// </summary>        public string spbill_create_ip = "";        /// <summary>        /// 订 单 生 成 时 间 ， 格 式 为yyyyMMddHHmmss，如 2009 年12 月 25 日 9 点 10 分 10 秒表示为 20091225091010。时区为 GMT+8 beijing。该时间取自商户服务器        /// </summary>        public string time_start = "";        /// <summary>        /// 交易结束时间        /// </summary>        public string time_expire = "";        /// <summary>        /// 商品标记 商品标记，该字段不能随便填，不使用请填空，使用说明详见第 5 节        /// </summary>        public string goods_tag = "";        /// <summary>        /// 接收微信支付成功通知        /// </summary>        public string notify_url = "";        /// <summary>        /// JSAPI、NATIVE、APP        /// </summary>        public string trade_type = "";        /// <summary>        /// 用户标识 trade_type 为 JSAPI时，此参数必传        /// </summary>        public string openid = "";        /// <summary>        /// 只在 trade_type 为 NATIVE时需要填写。        /// </summary>        public string product_id = "";    }}

TenpayUtil.cs

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Xml;namespace tenpay{    public class TenpayUtil    {        /// <summary>        /// 统一支付接口        /// </summary>        const string UnifiedPayUrl = "https://api.mch.weixin.qq.com/pay/unifiedorder";        /// <summary>        /// 网页授权接口        /// </summary>        const string access_tokenUrl = "https://api.weixin.qq.com/sns/oauth2/access_token";        /// <summary>        /// 微信订单查询接口        /// </summary>        const string OrderQueryUrl = "https://api.mch.weixin.qq.com/pay/orderquery";        /// <summary>        /// 随机串        /// </summary>        public static string getNoncestr()        {            Random random = new Random();            return MD5Util.GetMD5(random.Next(1000).ToString(), "GBK").ToLower().Replace("s", "S");        }        /// <summary>        /// 时间截，自1970年以来的秒数        /// </summary>        public static string getTimestamp()        {            TimeSpan ts = DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, 0);            return Convert.ToInt64(ts.TotalSeconds).ToString();        }        /// <summary>        /// 网页授权接口        /// </summary>        public static string getAccess_tokenUrl()        {            return access_tokenUrl;        }        /// <summary>        /// 获取微信签名        /// </summary>        /// <param name="sParams"></param>        /// <returns></returns>        public string getsign(SortedDictionary<string, string> sParams, string key)        {            int i = 0;            string sign = string.Empty;            StringBuilder sb = new StringBuilder();            foreach (KeyValuePair<string, string> temp in sParams)            {                if (temp.Value == "" || temp.Value == null || temp.Key.ToLower() == "sign")                {                    continue;                }                i++;                sb.Append(temp.Key.Trim() + "=" + temp.Value.Trim() + "&");            }            sb.Append("key=" + key.Trim() + "");            string signkey = sb.ToString();            sign = MD5Util.GetMD5(signkey, "utf-8");            return sign;        }        /// <summary>        /// post数据到指定接口并返回数据        /// </summary>        public string PostXmlToUrl(string url, string postData)        {            string returnmsg = "";            using (System.Net.WebClient wc = new System.Net.WebClient())            {                returnmsg = wc.UploadString(url, "POST", postData);            }            return returnmsg;        }        /// <summary>        /// 获取prepay_id        /// </summary>        public string getPrepay_id(UnifiedOrder order, string key)        {            string prepay_id = "";            string post_data = getUnifiedOrderXml(order, key);            string request_data = PostXmlToUrl(UnifiedPayUrl, post_data);            SortedDictionary<string, string> requestXML = GetInfoFromXml(request_data);            foreach (KeyValuePair<string, string> k in requestXML)            {                if (k.Key == "prepay_id")                {                    prepay_id = k.Value;                    break;                }            }            return prepay_id;        }        /// <summary>        /// 获取微信订单明细        /// </summary>        public OrderDetail getOrderDetail(QueryOrder queryorder, string key)        {            string post_data = getQueryOrderXml(queryorder, key);            string request_data = PostXmlToUrl(OrderQueryUrl, post_data);            OrderDetail orderdetail = new OrderDetail();            SortedDictionary<string, string> requestXML = GetInfoFromXml(request_data);            foreach (KeyValuePair<string, string> k in requestXML)            {                switch (k.Key)                {                    case "retuen_code":                        orderdetail.result_code = k.Value;                        break;                    case "return_msg":                        orderdetail.return_msg = k.Value;                        break;                    case "appid":                        orderdetail.appid = k.Value;                        break;                    case "mch_id":                        orderdetail.mch_id = k.Value;                        break;                    case "nonce_str":                        orderdetail.nonce_str = k.Value;                        break;                    case "sign":                        orderdetail.sign = k.Value;                        break;                    case "result_code":                        orderdetail.result_code = k.Value;                        break;                    case "err_code":                        orderdetail.err_code = k.Value;                        break;                    case "err_code_des":                        orderdetail.err_code_des = k.Value;                        break;                    case "trade_state":                        orderdetail.trade_state = k.Value;                        break;                    case "device_info":                        orderdetail.device_info = k.Value;                        break;                    case "openid":                        orderdetail.openid = k.Value;                        break;                    case "is_subscribe":                        orderdetail.is_subscribe = k.Value;                        break;                    case "trade_type":                        orderdetail.trade_type = k.Value;                        break;                    case "bank_type":                        orderdetail.bank_type = k.Value;                        break;                    case "total_fee":                        orderdetail.total_fee = k.Value;                        break;                    case "coupon_fee":                        orderdetail.coupon_fee = k.Value;                        break;                    case "fee_type":                        orderdetail.fee_type = k.Value;                        break;                    case "transaction_id":                        orderdetail.transaction_id = k.Value;                        break;                    case "out_trade_no":                        orderdetail.out_trade_no = k.Value;                        break;                    case "attach":                        orderdetail.attach = k.Value;                        break;                    case "time_end":                        orderdetail.time_end = k.Value;                        break;                    default:                        break;                }            }            return orderdetail;        }        /// <summary>        /// 把XML数据转换为SortedDictionary<string, string>集合        /// </summary>        /// <param name="strxml"></param>        /// <returns></returns>        protected SortedDictionary<string, string> GetInfoFromXml(string xmlstring)        {            SortedDictionary<string, string> sParams = new SortedDictionary<string, string>();            try            {                XmlDocument doc = new XmlDocument();                doc.LoadXml(xmlstring);                XmlElement root = doc.DocumentElement;                int len = root.ChildNodes.Count;                for (int i = 0; i < len; i++)                {                    string name = root.ChildNodes[i].Name;                    if (!sParams.ContainsKey(name))                    {                        sParams.Add(name.Trim(), root.ChildNodes[i].InnerText.Trim());                    }                }            }            catch { }            return sParams;        }        /// <summary>        /// 微信统一下单接口xml参数整理        /// </summary>        /// <param name="order">微信支付参数实例</param>        /// <param name="key">密钥</param>        /// <returns></returns>        protected string getUnifiedOrderXml(UnifiedOrder order, string key)        {            string return_string = string.Empty;            SortedDictionary<string, string> sParams = new SortedDictionary<string, string>();            sParams.Add("appid", order.appid);            sParams.Add("attach", order.attach);            sParams.Add("body", order.body);            sParams.Add("device_info", order.device_info);            sParams.Add("mch_id", order.mch_id);            sParams.Add("nonce_str", order.nonce_str);            sParams.Add("notify_url", order.notify_url);            sParams.Add("openid", order.openid);            sParams.Add("out_trade_no", order.out_trade_no);            sParams.Add("spbill_create_ip", order.spbill_create_ip);            sParams.Add("total_fee", order.total_fee.ToString());            sParams.Add("trade_type", order.trade_type);            order.sign = getsign(sParams, key);            sParams.Add("sign", order.sign);            //拼接成XML请求数据            StringBuilder sbPay = new StringBuilder();            foreach (KeyValuePair<string, string> k in sParams)            {                if (k.Key == "attach" || k.Key == "body" || k.Key == "sign")                {                    sbPay.Append("<" + k.Key + "><![CDATA[" + k.Value + "]]></" + k.Key + ">");                }                else                {                    sbPay.Append("<" + k.Key + ">" + k.Value + "</" + k.Key + ">");                }            }            return_string = string.Format("<xml>{0}</xml>", sbPay.ToString());            byte[] byteArray = Encoding.UTF8.GetBytes(return_string);            return_string = Encoding.GetEncoding("GBK").GetString(byteArray);            return return_string;                    }        /// <summary>        /// 微信订单查询接口XML参数整理        /// </summary>        /// <param name="queryorder">微信订单查询参数实例</param>        /// <param name="key">密钥</param>        /// <returns></returns>        protected string getQueryOrderXml(QueryOrder queryorder, string key)        {            string return_string = string.Empty;            SortedDictionary<string, string> sParams = new SortedDictionary<string, string>();            sParams.Add("appid", queryorder.appid);            sParams.Add("mch_id", queryorder.mch_id);            sParams.Add("transaction_id", queryorder.transaction_id);            sParams.Add("out_trade_no", queryorder.out_trade_no);            sParams.Add("nonce_str", queryorder.nonce_str);            queryorder.sign = getsign(sParams, key);            sParams.Add("sign", queryorder.sign);            //拼接成XML请求数据            StringBuilder sbPay = new StringBuilder();            foreach (KeyValuePair<string, string> k in sParams)            {                if (k.Key == "attach" || k.Key == "body" || k.Key == "sign")                {                    sbPay.Append("<" + k.Key + "><![CDATA[" + k.Value + "]]></" + k.Key + ">");                }                else                {                    sbPay.Append("<" + k.Key + ">" + k.Value + "</" + k.Key + ">");                }            }            return_string = string.Format("<xml>{0}</xml>", sbPay.ToString().TrimEnd(','));            return return_string;        }    }}

 看官网例子：

function onBridgeReady(){   WeixinJSBridge.invoke(       'getBrandWCPayRequest', {           "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        },       function(res){                if(res.err_msg == "get_brand_wcpay_request:ok" ) {}     // 使用以上方式判断前端返回,微信团队郑重提示：res.err_msg将在用户支付成功后返回    ok，但并不保证它绝对可靠。        }   ); }if (typeof WeixinJSBridge == "undefined"){   if( document.addEventListener ){       document.addEventListener('WeixinJSBridgeReady', onBridgeReady, false);   }else if (document.attachEvent){       document.attachEvent('WeixinJSBridgeReady', onBridgeReady);        document.attachEvent('onWeixinJSBridgeReady', onBridgeReady);   }}else{   onBridgeReady();} 

主要是prepay_id和paySign的获取。类库tenpay.dll的作用就是获取这两个东西的。

大致流程：获取公众号的code——》获取预定单号的openid——》获取prepay_id。

1.根据自己的业务逻辑生成内部订单

    protected void btnPay_Click(object sender, EventArgs e)    {        if (Fetch.GetUserCookie() == null)        {            Response.Redirect("/App/Login.aspx?url=/App/indexPay.aspx");            return;        }        int salePrice = Utility.StrToInt(OrderAmount, 0);        OnLineOrder onlineOrder = new OnLineOrder();        onlineOrder.ShareID = 13;        onlineOrder.OrderID = PayHelper.GetOrderIDByPrefix("WX");        #region 订单处理        if (Fetch.GetUserCookie() == null)        {            onlineOrder.OperUserID = 0;        }        else        {            onlineOrder.OperUserID = Fetch.GetUserCookie().UserID;        }        onlineOrder.Accounts = Fetch.GetUserCookie().Accounts;        onlineOrder.CardTotal = 1;        onlineOrder.CardTypeID = salePrice / 10; //< 30 ? 1 : salePrice < 60 ? 2 : salePrice < 120 ? 3 : 4;        onlineOrder.OrderAmount = salePrice;        onlineOrder.IPAddress = GameRequest.GetUserIP();        //生成订单        Message umsg = treasureFacade.RequestOrder(onlineOrder);        if (!umsg.Success)        {            RenderAlertInfo(true, umsg.Content, 2);            return;        }        #endregion        //发起微信支付        Response.Redirect("https://open.weixin.qq.com/connect/oauth2/authorize?appid=你的公众号appid&redirect_uri=http://你的网站/App/Pay/PayOrder.aspx?showwxpaytitle=1&response_type=code&scope=snsapi_base&state=" + OrderAmount + "_" + onlineOrder.OrderID + "#wechat_redirect");    }

2.进入公众号配置网页授权获取用户基本信息

这样配置后就可以调用微信的接口获取到公众号的code

Response.Redirect("https://open.weixin.qq.com/connect/oauth2/authorize?appid=你的公众号appid&redirect_uri=http://你的网站/App/Pay/PayOrder.aspx?showwxpaytitle=1&response_type=code&scope=snsapi_base&state=" + OrderAmount + "_" + onlineOrder.OrderID + "#wechat_redirect");

访问https://open.weixin.qq.com/connect/oauth2/authorize接口，成功后会跳转到设置的redirect_uri页面，其中会包含code参数，接下来就到redirect_uri页面（我这里就是PayOrder.aspx了）简单的获取code参数：

View Code

上面一句

protected string code = GameRequest.GetQueryString("code");

就获取到了传过来的code参数。

然后调用网页授权接口https://api.weixin.qq.com/sns/oauth2/access_token 获取openid

这个接口返回的数据是json类型的，使用JavaScriptSerializer类和结构体把openid取出：

    public struct authorization    {        public string access_token { get; set; }  //属性的名字，必须与json格式字符串中的"key"值一样。        public string expires_in { get; set; }        public string refresh_token { get; set; }        public string openid { get; set; }        public string scope { get; set; }    }

            TenpayUtil tenpay = new TenpayUtil();            string paySignKey = ConfigurationManager.AppSettings["paySignKey"].ToString();            string AppSecret = ConfigurationManager.AppSettings["AppSecret"].ToString();            string mch_id = ConfigurationManager.AppSettings["mch_id"].ToString();            appId = ConfigurationManager.AppSettings["AppId"].ToString();            string post_data = "appid=" + appId + "&secret=" + AppSecret + "&code=" + code + "&grant_type=authorization_code";            string requestData = tenpay.PostXmlToUrl(TenpayUtil.getAccess_tokenUrl(), post_data);            JavaScriptSerializer js = new JavaScriptSerializer();   //实例化一个能够序列化数据的类            authorization auth = js.Deserialize<authorization>(requestData);    //将json数据转化为对象类型并赋值给auth

AppId和AppSecret是公众号里面给的，mch_id是通过微信支付申请后微信发邮件给的，paySignKey是自己设置的证书密阴

TenpayUtil.getAccess_tokenUrl()="https://api.weixin.qq.com/sns/oauth2/access_token"

这样转化后就可以得到openid

order.openid = auth.openid;

终于到重头戏获取prepay_id了

            UnifiedOrder order = new UnifiedOrder();            order.appid = appId;            order.attach = "vinson";            order.body = OrderAmount + "拍币";            order.device_info = "";            order.mch_id = mch_id;            order.nonce_str = TenpayUtil.getNoncestr();            order.notify_url = "http://你的网站/App/Shop/pay.aspx";            order.openid = auth.openid;            order.out_trade_no = OrderID;            order.trade_type = "JSAPI";            order.spbill_create_ip = Page.Request.UserHostAddress;            order.total_fee = int.Parse(OrderAmount) * 100;            //order.total_fee = 1;            prepay_id = tenpay.getPrepay_id(order, paySignKey);

对象类型UnifiedOrder方便把多个参数融合一个对象中，看看tenpay.getPrepay_id(order, paySignKey)方法：

        /// <summary>        /// 获取prepay_id        /// </summary>        public string getPrepay_id(UnifiedOrder order, string key)        {            string prepay_id = "";            string post_data = getUnifiedOrderXml(order, key);            string request_data = PostXmlToUrl(UnifiedPayUrl, post_data);            SortedDictionary<string, string> requestXML = GetInfoFromXml(request_data);            foreach (KeyValuePair<string, string> k in requestXML)            {                if (k.Key == "prepay_id")                {                    prepay_id = k.Value;                    break;                }            }            return prepay_id;        }

接口UnifiedPayUrl="https://api.mch.weixin.qq.com/pay/unifiedorder"

这个接口的参数是xml格式的，返回来的数据也是xml格式的

        /// <summary>        /// 微信统一下单接口xml参数整理        /// </summary>        /// <param name="order">微信支付参数实例</param>        /// <param name="key">密钥</param>        /// <returns></returns>        protected string getUnifiedOrderXml(UnifiedOrder order, string key)        {            string return_string = string.Empty;            SortedDictionary<string, string> sParams = new SortedDictionary<string, string>();            sParams.Add("appid", order.appid);            sParams.Add("attach", order.attach);            sParams.Add("body", order.body);            sParams.Add("device_info", order.device_info);            sParams.Add("mch_id", order.mch_id);            sParams.Add("nonce_str", order.nonce_str);            sParams.Add("notify_url", order.notify_url);            sParams.Add("openid", order.openid);            sParams.Add("out_trade_no", order.out_trade_no);            sParams.Add("spbill_create_ip", order.spbill_create_ip);            sParams.Add("total_fee", order.total_fee.ToString());            sParams.Add("trade_type", order.trade_type);            order.sign = getsign(sParams, key);            sParams.Add("sign", order.sign);            //拼接成XML请求数据            StringBuilder sbPay = new StringBuilder();            foreach (KeyValuePair<string, string> k in sParams)            {                if (k.Key == "attach" || k.Key == "body" || k.Key == "sign")                {                    sbPay.Append("<" + k.Key + "><![CDATA[" + k.Value + "]]></" + k.Key + ">");                }                else                {                    sbPay.Append("<" + k.Key + ">" + k.Value + "</" + k.Key + ">");                }            }            return_string = string.Format("<xml>{0}</xml>", sbPay.ToString());            byte[] byteArray = Encoding.UTF8.GetBytes(return_string);            return_string = Encoding.GetEncoding("GBK").GetString(byteArray);            return return_string;                    }

所有参数准备完毕，就剩下最后的微信签名paySign了：

            prepay_id = tenpay.getPrepay_id(order, paySignKey);            timeStamp = TenpayUtil.getTimestamp();            nonceStr = TenpayUtil.getNoncestr();            SortedDictionary<string, string> sParams = new SortedDictionary<string, string>();            sParams.Add("appId", appId);            sParams.Add("timeStamp", timeStamp);            sParams.Add("nonceStr", nonceStr);            sParams.Add("package", "prepay_id=" + prepay_id);            sParams.Add("signType", "MD5");            paySign = tenpay.getsign(sParams, paySignKey);

这里要注意了：appId这些参数的大小写一定要和js那边的参数大小写一致！稍微有所不同都会提示“商户签名错误”。

<script type="text/javascript">    var appId = "<%=appId %>";    var timeStamp = "<%=timeStamp %>";    var nonceStr = "<%=nonceStr %>";    var prepay_id = "<%=prepay_id %>";    var paySign = "<%=paySign %>";    var OrderID="<%=OrderID %>";    //alert("appId:" + appId + ",timeStamp:" + timeStamp + ",nonceStr:" + nonceStr + ",prepay_id:" + prepay_id + ",paySign:" + paySign);    //return;    function onBridgeReady() {        WeixinJSBridge.invoke(       'getBrandWCPayRequest', {           "appId": appId,     //公众号名称，由商户传入                "timeStamp": timeStamp,         //时间戳，自1970年以来的秒数                "nonceStr": nonceStr, //随机串                "package": "prepay_id=" + prepay_id,           "signType": "MD5",         //微信签名方式:                "paySign": paySign //微信签名        },       function (res) {           if (res.err_msg == "get_brand_wcpay_request:ok") {               $(function () {                   $.ajax({                       contentType: "application/json",                       url: "/WS/vinson.asmx/payWeiXin",                       data: "{OrderID:'" + OrderID + "'}",                       type: "POST",                       dataType: "json",                       success: function (json) {                           json = eval("(" + json.d + ")");                           if (json.success == "success") {                               $("#tip").text("支付成功，正在跳转......");                               window.location = "http://你的网站/App/Shop/successful.aspx";                           }                           else {                               $("#tip").text(json.msg);                               alert(json.msg);                               window.location = "http://你的网站/App/indexPay.aspx";                           }                       },                       error: function (err, ex) {                           alert(err.responseText);                       }                   });               })           }     // 使用以上方式判断前端返回,微信团队郑重提示：res.err_msg将在用户支付成功后返回    ok，但并不保证它绝对可靠。            else {               alert("交易取消");               window.location="http://www.你的网站.cn/App/indexPay.aspx";           }       }   );    }    if (typeof WeixinJSBridge == "undefined") {        if (document.addEventListener) {            document.addEventListener('WeixinJSBridgeReady', onBridgeReady, false);        } else if (document.attachEvent) {            document.attachEvent('WeixinJSBridgeReady', onBridgeReady);            document.attachEvent('onWeixinJSBridgeReady', onBridgeReady);        }    } else {        onBridgeReady();    } </script>

要发起微信支付，还要到公众号设置支付授权目录：

一切准备就绪，就可以真正的发起微信支付了：

vinson