微信小程序如何使用C#实现支付功能

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具体代码如下

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Web;using System.Web.Mvc;using System.IO;using System.Security.Cryptography;using System.Text;using System.Xml;using Newtonsoft.Json;using Newtonsoft.Json.Linq;namespace Mvc_vue.Controllers{  public class wxController : Controller  {    //    // GET: /wx/    public ActionResult Index()    {      return View();    }    //所需值    public static string _appid = "wxd930ea5d5a258f4f";    public static string _mch_id = "10000100";    public static string _key = "192006250b4c09247ec02edce69f6a2d";    //模拟wx统一下单 openid(前台获取)    public string getda(string openid)    {      return Getprepay_id(_appid, "shanghaifendian", "monixiaofei", _mch_id, GetRandomString(30), "http://www.weixin.qq.com/wxpay/pay.php", openid, getRandomTime(), 1);    }        //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 + "¬ify_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      //string strHash=HmacSHA256("sha256",strmd5).ToUpper();  //签名方式只需一种(MD5 或 HmacSHA256   【支付文档需仔细看】)      //签名      var formData = "";      formData += "" + appid + "";//appid       formData += "" + attach + ""; //附加数据(描述)      formData += "" + body + "";//商品描述      formData += "" + mch_id + "";//商户号       formData += "" + nonce_str + "";//随机字符串，不长于32位。       formData += "" + notify_url + "";//通知地址      formData += "" + openid + "";//openid      formData += "" + bookingNo + "";//商户订单号  --待      formData += "61.50.221.43";//终端IP --用户ip      formData += "" + total_fee + "";//支付金额单位为（分）      formData += "JSAPI";//交易类型(JSAPI--公众号支付)      formData += "" + strMD5 + ""; //签名      formData += "";      //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 w = new wx();      w.timeStamp = _time;      w.nonceStr = nonce_str;      w.package = "prepay_id=" + prepay_id;      w.paySign = MD5(strB).ToUpper(); ;      w.signType = "MD5";      //向小程序发送json数据       return JsonConvert.SerializeObject(w);    }    /// 
    /// 生成随机串      /// 
    /// 字符串长度    ///     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();    }    /// 
    /// 获取时间戳    /// 
    ///     private static long getTime()    {      TimeSpan cha = (DateTime.Now - TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(1970, 1, 1)));      long t = (long)cha.TotalSeconds;      return t;    }    /// 
    /// MD5签名方法     /// 
     /// 加密参数     ///      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;    }    /// 
    /// HMAC-SHA256签名方式    /// 
    ///     ///     ///     private static string HmacSHA256(string message, string secret)    {      secret = secret ?? "";      var encoding = new System.Text.UTF8Encoding();      byte[] keyByte = encoding.GetBytes(secret);      byte[] messageBytes = encoding.GetBytes(message);      using (var hmacsha256 = new HMACSHA256(keyByte))      {        byte[] hashmessage = hmacsha256.ComputeHash(messageBytes);        return Convert.ToBase64String(hashmessage);      }    }    /// 
    /// wx统一下单请求数据    /// 
    /// 请求地址    /// 参数    ///     private static string sendPost(string URL, string urlArgs)    {      //context.Request["args"]      System.Net.WebClient wCient = new System.Net.WebClient();      wCient.Headers.Add("Content-Type", "application/x-www-form-urlencoded");      byte[] postData = System.Text.Encoding.ASCII.GetBytes("body=" + 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;202     }    /// 
    /// 生成订单号    /// 
    ///     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;    }  }}

使用的是MVC .NET Framework4

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