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：
using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; using Game.Utils; using System.Web.Script.Serialization; using tenpay; using System.Configuration; using System.Text; public partial class App_Pay_PayOrder : System.Web.UI.Page { protected string code = GameRequest.GetQueryString("code"); protected string state = GameRequest.GetQueryString("state"); protected string OrderAmount = ""; protected string OrderID = ""; protected string OrderTime = ""; protected string OrderGive = ""; protected string ImagePath = ""; protected string appId = ""; protected string timeStamp = ""; protected string nonceStr = ""; protected string prepay_id = ""; protected string paySign = ""; protected void Page_Load(object sender, EventArgs e) { LoadOrder(); } private void LoadOrder() { string[] values = state.Split('_'); if (values.Length == 2) { OrderAmount = values[0]; OrderID = values[1]; } OrderTime = (new DataControl()).SelectValue("select ApplayDate from OnLineOrder where OrderId='" + OrderID + "'", "DBTreasure", "").ToString(); ImagePath = (new DataControl()).SelectValue("select ImagePath from CartTypeImage where CardTypeId=" + OrderAmount, "DBTreasure", "").ToString(); } 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; } } protected void btnPay_Click(object sender, EventArgs e) { try { 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 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); 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); } catch (Exception ex) { Response.Write(ex.ToString()); return; } Response.Redirect("http://你的网站/App/Pay/pay.aspx?showwxpaytitle=1&appId=" + appId + "&timeStamp=" + timeStamp + "&nonceStr=" + nonceStr + "&prepay_id=" + prepay_id + "&signType=MD5&paySign=" + paySign + "&OrderID=" + OrderID); } }
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：
