C# MVC 微信支付教程系列之公众号支付代码

后台代码如下：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using Web.Models;
using WxPayAPI;

namespace Web.Controllers
{
 public class HomeController : Controller
 {
  JsApiPay jsApiPay = new JsApiPay();
  // GET: Home
  public ActionResult Index()
  {
   if (Session["openid"] == null)
   {
    try
    {
     //调用【网页授权获取用户信息】接口获取用户的openid和access_token
     GetOpenidAndAccessToken();

    }
    catch (Exception ex)
    {
     //Response.Write(ex.ToString());
     //throw;
    }
   }
   return View();
  }


  /**
  * 
  * 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://www.easck.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()
  {
   if (Session["code"] != null)
   {
    //获取code码，以获取openid和access_token
    string code = Session["code"].ToString();
    Log.Debug(this.GetType().ToString(), "Get code : " + code);
    jsApiPay.GetOpenidAndAccessTokenFromCode(code);
   }
   else
   {
    //构造网页授权获取code的URL
    string host = Request.Url.Host;
    string path = Request.Path;
    string redirect_uri = HttpUtility.UrlEncode("http://www.easck.com//open.weixin.qq.com/connect/oauth2/authorize?" + data.ToUrl();
    Log.Debug(this.GetType().ToString(), "Will Redirect to URL : " + url);
    Session["url"] = url;    
   }
  }


  /// <summary>
  /// 获取code
  /// </summary>
  /// <returns></returns>
  [HttpPost]
  public ActionResult getCode()
  {
   object objResult = "";
   if (Session["url"] != null)
   {
    objResult = Session["url"].ToString();
   }
   else
   {
    objResult = "url为空。";
   }
   return Json(objResult);
  }

  /// <summary>
  /// 通过code换取网页授权access_token和openid的返回数据
  /// </summary>
  /// <returns></returns>
  [HttpPost]
  public ActionResult getWxInfo()
  {
   object objResult = "";
   string strCode = Request.Form["code"];
   if (Session["access_token"] == null || Session["openid"] == null)
   {
    jsApiPay.GetOpenidAndAccessTokenFromCode(strCode);
   }
   string strAccess_Token = Session["access_token"].ToString();
   string strOpenid = Session["openid"].ToString();
   objResult = new { openid = strOpenid, access_token = strAccess_Token };
   return Json(objResult);
  }




  /// <summary>
  /// 充值
  /// </summary>
  /// <returns></returns>
  [HttpPost]
  public ActionResult MeterRecharge()
  {
   object objResult = "";
   string strTotal_fee = Request.Form["totalfee"];
   string strFee = (double.Parse(strTotal_fee) * 100).ToString();

   //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.openid = Session["openid"].ToString();
   jsApiPay.total_fee = int.Parse(strFee);

   //JSAPI支付预处理
   try
   {
    string strBody = "南宫萧尘微信支付";//商品描述
    WxPayData unifiedOrderResult = jsApiPay.GetUnifiedOrderResult(strBody);
    WxPayData wxJsApiParam = jsApiPay.GetJsApiParameters();//获取H5调起JS API参数，注意，这里引用了官方的demo的方法，由于原方法是返回string的，所以，要对原方法改为下面的代码，代码在下一段

    ModelForOrder aOrder = new ModelForOrder()
    {
     appId = wxJsApiParam.GetValue("appId").ToString(),
     nonceStr = wxJsApiParam.GetValue("nonceStr").ToString(),
     packageValue = wxJsApiParam.GetValue("package").ToString(),
     paySign = wxJsApiParam.GetValue("paySign").ToString(),
     timeStamp = wxJsApiParam.GetValue("timeStamp").ToString(),
     msg = "成功下单,正在接入微信支付."
    };
    objResult = aOrder;
   }
   catch (Exception ex)
   {
    ModelForOrder aOrder = new ModelForOrder()
    {
     appId = "",
     nonceStr = "",
     packageValue = "",
     paySign = "",
     timeStamp = "",
     msg = "下单失败，请重试,多次失败,请联系管理员."
    };
    objResult = aOrder;
   }
   return Json(objResult);
  }


 }
} 

								 
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