微信公众平台支付开发详解

public JsonResult CreateRecharegOrder(decimal money)
 {
 if (money < (decimal)0.01) return Json(new PaymentResult("充值金额非法！"));
 var user = _workContext.CurrentUser;
 var order = _paymentService.CreateRechargeOrder(user.Id, money);
 return Json(new PaymentResult(true) {OrderId = order.OrderNumber});
 }

[LoginValid]
 public ActionResult H5Pay(string orderNumber)
 {
 var user = _workContext.CurrentUser;
 var order = _paymentService.GetOrderByOrderNumber(orderNumber);
 //判断订单是否存在
 //订单是否已经支付了
 var openid = user.OpenId;
 var jsApipay = new JsApiPayMvc(this.ControllerContext.HttpContext);
 jsApipay.openid = openid;
 jsApipay.total_fee = (int)order.Amount * 100;
 WxPayData unifiedOrderResult = jsApipay.GetUnifiedOrderResult();
 ViewBag.wxJsApiParam = jsApipay.GetJsApiParameters();//获取H5调起JS API参数 
 ViewBag.unifiedOrder = unifiedOrderResult.ToPrintStr();
 ViewBag.OrderNumber = order.OrderNumber;
 return View();
 }

using System;
using System.Collections.Generic;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Runtime.Serialization;
using System.IO;
using System.Text;
using System.Net;
using System.Web.Security;
using LitJson;
namespace WxPayAPI
{
 public class JsApiPayMvc
 {
 /// <summary>
 /// 保存页面对象，因为要在类的方法中使用Page的Request对象
 /// </summary>
 public HttpContextBase context { 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 JsApiPayMvc(HttpContextBase _context)
 {
 context = _context;
 }
 /**
 * 
 * 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 void GetOpenidAndAccessToken(string code)
 {
 if (!string.IsNullOrEmpty(code))
 {
 //获取code码，以获取openid和access_token
 Log.Debug(this.GetType().ToString(), "Get code : " + code);
 GetOpenidAndAccessTokenFromCode(code);
 }
 else
 {
 //构造网页授权获取code的URL
 string host = context.Request.Url.Host;
 string path = context.Request.Path;
 string redirect_uri = HttpUtility.UrlEncode("http://" + host + path);
 WxPayData data = new WxPayData();
 data.SetValue("appid", WxPayConfig.APPID);
 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 
 context.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", WxPayConfig.APPID);
 data.SetValue("secret", WxPayConfig.APPSECRET);
 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");
 data.SetValue("attach", "test");
 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");
 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 = context.Request.Url.Host;
 string path = context.Request.Path;
 string queryString = context.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",WxPayConfig.APPID);
 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",WxPayConfig.APPID);
 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;
 }
 }
}

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。 
 }
 ); 
}

@{
 ViewBag.Title = "微信支付";
 Layout = "~/Views/Shared/_Layout.cshtml";
}
<div class="page" id="Wxpayment">
 <div class="content">
 <div>订单详情：@Html.Raw(ViewBag.unifiedOrder)</div>
 <button id="h5pay" onclick="callpay()">支付</button>
 </div>
 <input type="hidden" value="@ViewBag.OrderNumber" id="ordernum"/>
</div>
<script type="text/javascript">
 //调用微信JS api 支付
 function jsApiCall() {
 WeixinJSBridge.invoke(
 'getBrandWCPayRequest',
 @Html.Raw(ViewBag.wxJsApiParam),//josn串
 function (res)
 {
 WeixinJSBridge.log(res.err_msg);
 //alert(res.err_code + res.err_desc + res.err_msg);
 if (res.err_msg == "get_brand_wcpay_request:ok") {
 var num = $("#ordernum").val();
 $.post("/payment/WeiXinPaySuccess", { ordernumber: num }, function(data) {
 if (data.IsSuccess === true) {
 alert("支付成功");
 location.href = document.referrer;
 } else {
 }
 });
 } 
 if (res.err_msg == 'get_brand_wcpay_request:cancel') {
 $('.button').removeAttr('submitting');
 alert('取消支付');
 } 
 }
 );
 }
 function callpay()
 {
 if (typeof WeixinJSBridge == "undefined")
 {
 alert("WeixinJSBridge =");
 if (document.addEventListener)
 {
 document.addEventListener('WeixinJSBridgeReady', jsApiCall, false);
 }
 else if (document.attachEvent)
 {
 document.attachEvent('WeixinJSBridgeReady', jsApiCall);
 document.attachEvent('onWeixinJSBridgeReady', jsApiCall);
 }
 }
 else
 {
 jsApiCall();
 }
 }
</script>