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C# 微信小程序支付（ASP.NET Core WebApi ）

支付效果展示

1、获取openid

　　方式一：可以通过wx.login方式获取openid

　　官方文档：https://developers.weixin.qq.com/miniprogram/dev/api-backend/open-api/login/auth.code2Session.html

 wx.login({
      success: res => {
        // 发送 res.code 到后台换取 openId, sessionKey, unionId
        if (res.code) {
          console.log('临时登录凭证code:'+res.code);
          wx.request({
            url: 'https://api.weixin.qq.com/sns/jscode2session',
            data: {
              //填上自己的小程序唯一标识
              appid: 'wxdf1bb7bb7ba9XXXX',
              //填上自己的小程序的 app secret
              secret: '4b4f1a2b1ae40c01b29aa1e595d6XXXX',
              grant_type: 'authorization_code',
              js_code: res.code
            },
            method: 'GET',
            header: { 'content-type': 'application/json' },
            success: function (openIdRes) {
              console.info(openIdRes);
              console.info("登录成功返回的openId：" + openIdRes.data.openid);
              console.info("登录成功返回的session_key：" + openIdRes.data.session_key);
            },
            fail: function (error) {
              console.info(error);
            }
          })
        }
      }
    })

　　方式二：通过后台获取openid，前台需要传入code（临时登录凭证），这里我们讲述支付代码用的是方式二（appid、secret最好不要放在js文件里面）

 private static string sendGet(string js_code)
 {
            string url = string.Format("https://api.weixin.qq.com/sns/jscode2session?appid=" + _appid + "&secret=" + _secret + "&grant_type=authorization_code&js_code=" + js_code + "");
            WebClient wc = new WebClient();
            Encoding enc = Encoding.GetEncoding("UTF-8");
            Byte[] pageData = wc.DownloadData(url);
            string re = enc.GetString(pageData);
            return re;
 }

2、统一下单

　　官方文档：https://pay.weixin.qq.com/wiki/doc/api/wxa/wxa_api.php?chapter=9_1

    [Route("api/[controller]")]
    [ApiController]
    public class PaymentController : ControllerBase
    {

        //所需值
        public readonly static string _appid = "wx76bf5470a329XXXX";//小程序ID
        public readonly static string _secret = "17ccaa4f1da1d23c248a25884c7bXXXX";//小程序App/Secret
        public readonly static string _mch_id = "150301XXXX";//商户号
        public readonly static string _key = "49992dd11dd54545bead167681abXXXX";//微信支付的Key/Secret

        /// <summary>
        /// 模拟wx统一下单
        /// </summary>
        /// <param name="openid">前台获取用户标识</param>
        /// <returns></returns>
        [HttpGet]
        public string GetAll(string openid, decimal amount)
        {
            if (openid == null)
            {
                return "";
            }
            return Getprepay_id(_appid, "支付测试", "JSAPI支付测试", _mch_id, GetRandomString(30), "http://www.weixin.qq.com/wxpay/pay.php", openid, getRandomTime(), Convert.ToInt32(amount * 100));
        }

        [HttpGet("{js_code}")]
        public string GetOpenId(string js_code)
        {
            if (js_code == null)
            {
                return "";
            }
            return sendGet(js_code);
        }

        //微信统一下单获取prepay_id & 再次签名返回数据
        private static string Getprepay_id(string appid, string attach, string body, string mch_id, string nonce_str, string notify_url, string openid, string bookingNo, int total_fee)
        {
            var url = "https://api.mch.weixin.qq.com/pay/unifiedorder";//微信统一下单请求地址
            string strA = "appid=" + appid + "&attach=" + attach + "&body=" + body + "&mch_id=" + mch_id + "&nonce_str=" + nonce_str + "&notify_url=" + notify_url + "&openid=" + openid + "&out_trade_no=" + bookingNo + "&spbill_create_ip=61.50.221.43&total_fee=" + total_fee + "&trade_type=JSAPI";
            string strk = strA + "&key=" + _key;  //key为商户平台设置的密钥key(假)
            string strMD5 = MD5(strk).ToUpper();//MD5签名

            //签名
            var formData = "<xml>";
            formData += "<appid>" + appid + "</appid>";//appid  
            formData += "<attach>" + attach + "</attach>"; //附加数据(描述)
            formData += "<body>" + body + "</body>";//商品描述
            formData += "<mch_id>" + mch_id + "</mch_id>";//商户号  
            formData += "<nonce_str>" + nonce_str + "</nonce_str>";//随机字符串，不长于32位。  
            formData += "<notify_url>" + notify_url + "</notify_url>";//通知地址
            formData += "<openid>" + openid + "</openid>";//openid
            formData += "<out_trade_no>" + bookingNo + "</out_trade_no>";//商户订单号
            formData += "<spbill_create_ip>61.50.221.43</spbill_create_ip>";//终端IP
            formData += "<total_fee>" + total_fee + "</total_fee>";//支付金额单位为（分）
            formData += "<trade_type>JSAPI</trade_type>";//交易类型(JSAPI--公众号支付)
            formData += "<sign>" + strMD5 + "</sign>"; //签名
            formData += "</xml>";

            //请求数据
            var getdata = sendPost(url, formData);

            //获取xml数据
            XmlDocument doc = new XmlDocument();
            doc.LoadXml(getdata);
            //xml格式转json
            string json = Newtonsoft.Json.JsonConvert.SerializeXmlNode(doc);

            JObject jo = (JObject)JsonConvert.DeserializeObject(json);
            string prepay_id = jo["xml"]["prepay_id"]["#cdata-section"].ToString();

            //时间戳
            string _time = getTime().ToString();

            //再次签名返回数据至小程序
            string strB = "appId=" + appid + "&nonceStr=" + nonce_str + "&package=prepay_id=" + prepay_id + "&signType=MD5&timeStamp=" + _time + "&key=" + _key;

            //wx自己写的一个类
            PaymentEntity payment = new PaymentEntity();
            payment.timeStamp = _time;
            payment.nonceStr = nonce_str;
            payment.package = "prepay_id=" + prepay_id;
            payment.paySign = MD5(strB).ToUpper();
            payment.signType = "MD5";

            //向小程序返回json数据
            return JsonConvert.SerializeObject(payment);
        }

        /// <summary>
        /// 生成随机串    
        /// </summary>
        /// <param name="length">字符串长度</param>
        /// <returns></returns>
        private static string GetRandomString(int length)
        {
            const string key = "ABCDEFGHJKLMNPQRSTUVWXYZ23456789";
            if (length < 1)
                return string.Empty;

            Random rnd = new Random();
            byte[] buffer = new byte[8];

            ulong bit = 31;
            ulong result = 0;
            int index = 0;
            StringBuilder sb = new StringBuilder((length / 5 + 1) * 5);

            while (sb.Length < length)
            {
                rnd.NextBytes(buffer);

                buffer[5] = buffer[6] = buffer[7] = 0x00;
                result = BitConverter.ToUInt64(buffer, 0);

                while (result > 0 && sb.Length < length)
                {
                    index = (int)(bit & result);
                    sb.Append(key[index]);
                    result = result >> 5;
                }
            }
            return sb.ToString();
        }

        /// <summary>
        /// 生成订单号
        /// </summary>
        /// <returns></returns>
        private static string getRandomTime()
        {
            Random rd = new Random();//用于生成随机数
            string DateStr = DateTime.Now.ToString("yyyyMMddHHmmssMM");//日期
            string str = DateStr + rd.Next(10000).ToString().PadLeft(4, '0');//带日期的随机数
            return str;
        }

        /// <summary>
        /// MD5签名方法  
        /// </summary>  
        /// <param name="inputText">加密参数</param>  
        /// <returns></returns>  
        private static string MD5(string inputText)
        {
            MD5 md5 = new MD5CryptoServiceProvider();
            byte[] fromData = System.Text.Encoding.UTF8.GetBytes(inputText);
            byte[] targetData = md5.ComputeHash(fromData);
            string byte2String = null;

            for (int i = 0; i < targetData.Length; i++)
            {
                byte2String += targetData[i].ToString("x2");
            }

            return byte2String;
        }

        /// <summary>
        /// wx统一下单请求数据
        /// </summary>
        /// <param name="URL">请求地址</param>
        /// <param name="urlArgs">参数</param>
        /// <returns></returns>
        private static string sendPost(string URL, string urlArgs)
        {

            WebClient wCient = new WebClient();
            wCient.Headers.Add("Content-Type", "application/x-www-form-urlencoded");
            byte[] postData = System.Text.Encoding.UTF8.GetBytes(urlArgs);
            byte[] responseData = wCient.UploadData(URL, "POST", postData);

            string returnStr = System.Text.Encoding.UTF8.GetString(responseData);//返回接受的数据 
            return returnStr;
        }

        /// <summary>
        /// 获取时间戳
        /// </summary>
        /// <returns></returns>
        private static long getTime()
        {
            TimeSpan ts = DateTime.Now - new DateTime(1970, 1, 1, 0, 0, 0, 0);
            return Convert.ToInt64(ts.TotalSeconds);

        }

        private static string sendGet(string js_code)
        {
            string url = string.Format("https://api.weixin.qq.com/sns/jscode2session?appid=" + _appid + "&secret=" + _secret + "&grant_type=authorization_code&js_code=" + js_code + "");
            WebClient wc = new WebClient();
            Encoding enc = Encoding.GetEncoding("UTF-8");
            Byte[] pageData = wc.DownloadData(url);
            string re = enc.GetString(pageData);
            return re;
        }

    }

3、发起微信支付

　　上面后台代码会返回timeStamp、nonceStr、package、signType、paySign拿到数据后传递给wx.requestPayme(Object object)

　　官方文档：https://developers.weixin.qq.com/miniprogram/dev/api/open-api/payment/wx.requestPayment.html

// pages/home/home.js
Page({
  data: {
    amount: 0
  },
  inputvalue: function(e) {
    if (e.detail.value == "") {
      this.setData({
        amount: 0,

      })
    } else {
      this.setData({
        amount: e.detail.value,
      })
    }
  },
  //得到openid
  payment: function() {
    console.log(this.data.amount);
    var that = this;
    wx.login({
      success: res => {
        if (res.code) {
          //console.log('临时登录凭证code:' + res.code);
          wx.request({
            url: 'https://localhost:44302/api/payment/' + res.code,
            method: 'GET',
            header: {
              'content-type': 'application/json'
            },
            success: function(openIdRes) {
              console.info(openIdRes);
              var openid = openIdRes.data.openid;
              console.info("登录成功返回的openId：" + openid);
              that.generateOrder(openid)
            },
            fail: function(error) {
              console.info(error);
            }
          })
        }
      }
    })
  },
  //生成商户订单
  generateOrder: function(openid) {
    var that = this;
    wx.request({
      url: 'https://localhost:44302/api/payment',
      data: {
        openid: openid + '',
        amount: that.data.amount
      },
      method: 'GET',
      header: {
        'content-type': 'application/json'
      },
      success: function (param) {
        that.zf(param);
      },
      fail: function(error) {
        console.info(error);
      }
    })
  },
  //支付
  zf: function (param) {
    var that = this;
    console.log("发起支付")
    console.log(param)
    wx.requestPayment({
      timeStamp: param.data.timeStamp,
      nonceStr: param.data.nonceStr,
      package: param.data.package,
      signType: param.data.signType,
      paySign: param.data.paySign,
      success: function (res) {
        console.log("success");
        console.log(res);
      },
      fail: function (res) {
        console.log("fail")
        console.log(res);
      },
      complete: function (res) {
        console.log("complete");
        console.log(res)
      }
    })
  }
})

WXML

<!--pages/home/home.wxml-->
<input class="weui-input" style="margin-left: 20px;margin-right:20px;" type="number" bindinput="inputvalue" placeholder="￥请输入充值金额" />
  <view class='add_btn'>
    <button style="100vw;margin-top:20px;" bindtap="payment" class="btn"> 支付 </button>
  </view>

WXSS

.add_btn {
  width: 100%;
  display: flex;
}

.btn {
  background: #0072c6;
  color: #fff;
  float: right;
  border-radius: 0px 4px 0px 0px;
}

　　源代码：

　　链接：https://pan.baidu.com/s/1m4feS-XvdQsHYlWql8zQAA
　　提取码：da9l
　　后续会陆续更新其他资料,喜欢请关注哦！

　　原文参考：https://www.cnblogs.com/oneall/p/9548722.html

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原文地址：https://www.cnblogs.com/duhaoran/p/12867126.html