.NET微信支付集成实例

微信端HTML页面下单事件：

document.getElementById('btn-wxpay')addEventListener('tap', function (e) {
//创建订单
$.post('/Orders/Create', orderdata, function(result){
//创建订单成功
if (result.status == 'success') {
//开始调用微信JS API支付接口
WeixinJSBridge.invoke('getBrandWCPayRequest', JSON.parse(result.data), function (res) {
//支付成功，重定向只支付页面
if (res.err_msg == 'get_brand_wcpay_request:ok') {
window.location.href = '/Orders/CreateSuccess/' + result.orderId;
} else {
//支付失败，提示错误原因，重定向至订单详情页面
if (res.err_msg == 'get_brand_wcpay_request:cancel') {
alert('支付过程中用户取消');
} else if (res.err_msg == 'get_brand_wcpay_request:fail') {
alert('支付失败');
} else {
alert(res.err_msg);
}
window.location.href = '/Orders/Details/' + result.orderId;
}
});
}else{
//创建订单失败，提示错误
alert(result.error);
}
});
}

服务端对应处理模块：

//创建订单，同时对订单进行预支付
public ActionResult Create(OrderCreateViewModel model){
try{
using(var db = new MyDbEntities()){
db.Orders.Add(new Order(){ Name = model.Name, Weight = model.Weight, OrderTotal = model.OrderTotal, OrderStatus = WaitBuyerPay, Gateway = 'wxpay' });
db.SaveChanges();
return Json(new { status = "success", orderId = order.OrderId, data = GetJsBrandWCPayRequestApiParameters(order.Name, order.Name, (int)(order.OrderTotal * 100), 'openId')});
}
}catch (Exception ex){
return Json(new { status = "error", error = ex.Message });
}
}
//生成微信JS API支付接口参数
public string GetJsBrandWCPayRequestApiParameters(string body, string out_trade_no, int total_fee, string openid){
var parameters = new Dictionary<string string="">();
parameters.Add("appId", 'wx0000000000000000');
parameters.Add("timeStamp", 'timeStamp');
parameters.Add("nonceStr", 'nonceStr');
//获取预支付订单号
parameters.Add("package", string.Format("prepay_id={0}", GetPrepayId('wx0000000000000000', '0000000000', '000000000000000', 'nonceStr', body, out_trade_no, total_fee, openid)));
parameters.Add("signType", "MD5");
parameters.Add("paySign", GetPaySign(parameters, '000000000000000'));
return JsonConvert.SerializeObject(parameters);
}
//获取预支付订单号
public static string GetPrepayId(string appId, string mchId, string mchKey, string nonceStr, string body, string out_trade_no, int total_fee, string openid){
HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create("https://api.mch.weixin.qq.com/pay/unifiedorder");
myRequest.Method = "POST";
myRequest.ContentType = "application/x-www-form-urlencoded; charset=UTF-8";
myRequest.Accept = "application/json";
var formQuery = GetUnifiedOrderApiParameters(appId, mchId, mchKey, nonceStr, body, out_trade_no, total_fee, openid);
using (var sw = new StreamWriter(myRequest.GetRequestStream())){
sw.Write(formQuery);
}
string responseText = string.Empty;
using (HttpWebResponse response = (HttpWebResponse)myRequest.GetResponse()){
using (StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8)){
responseText = reader.ReadToEnd().ToString();
}
}
var doc = XDocument.Parse(responseText);
if (doc.Root.Element("return_code").Value == "FAIL" || doc.Root.Element("result_code").Value == "FAIL"){
if (doc.Root.Element("err_code") != null)
throw new WeixinPayException(doc.Root.Element("err_code").Value, doc.Root.Element("err_code_des").Value);
else
throw new Exception(doc.Root.Element("return_msg").Value);
}else{
return doc.Root.Element("prepay_id").Value;
}
}
</string>

通用通知接口处理模块：

public ActionResult Notify()
{
//读取从客户端发出的原始数据并解码
var xml = System.Text.Encoding.UTF8.GetString(Request.BinaryRead(Request.TotalBytes));
if (!string.IsNullOrEmpty(xml))
{
//解析为XML文档实例
var doc = XDocument.Parse(xml);
var originalSign = doc.Root.Element("sign").Value;
var parameters = doc.Root.Elements().Where(m => m.Name != "sign").ToDictionary(m => m.Name.LocalName, m => m.Value);
//签名验证
var sign = GetPaySign(parameters, "MchKey");
var returnDic = new Dictionary<string, string>();
if (sign != originalSign)
{
Log.Error("签名失败：" + String.Join(";", parameters.Select(m => m.Key + ":" + m.Value).ToArray()));
returnDic.Add("return_code", "FAIL");
returnDic.Add("return_msg", "签名失败");
}
else
{
returnDic.Add("return_code", "SUCCESS");
}
//返回处理结果给微信
Response.Write(WeixinSDK.DictionaryToXML(returnDic));
//业务处理
if (sign == originalSign)
{
if (parameters["return_code"] == "FAIL")
{
Log.Error("通信出错：" + String.Join(";", parameters.Select(m => m.Key + ":" + m.Value)));
}
else if (parameters["result_code"] == "FAIL")
{
Log.Error("业务出错：" + String.Join(";", parameters.Select(m => m.Key + ":" + m.Value)));
}
else
{
Log.Info("支付成功：" + String.Join(";", parameters.Select(m => m.Key + ":" + m.Value)));
var request = new WeixinPayNotifyRequest()
{
transaction_id = parameters["transaction_id"],
out_trade_no = parameters["out_trade_no"]
};
//最终对该笔交易进行确认
ConfirmPay(request.out_trade_no, request.transaction_id);
}
}
}
return Content(string.Empty);
}