C# 微信现金红包高级接口 示例源码下载

using System;using System.Collections.Generic;using System.Net;using System.Net.Security;using System.Security.Cryptography;using System.Security.Cryptography.X509Certificates;using System.Text;using System.Threading.Tasks;using System.Xml.Linq;namespace WeChatRedPacketSample{ public class RedPacketService { static readonly Random _Random = new Random(); readonly string m_PayKey; readonly string m_MerchantId; readonly IWeChatClient m_WeChatClient; static RedPacketService() { ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(CheckValidationResult); } public RedPacketService(string merchantId, string payKey, IWeChatClient client) { if (merchantId == null) throw new ArgumentNullException("merchantId"); if (payKey == null) throw new ArgumentNullException("payKey"); if (client == null) throw new ArgumentNullException("client"); m_PayKey = payKey; m_WeChatClient = client; } public async Task<RedPacketSentResult> SendAsync(RedPacket request) { if (request == null) throw new ArgumentNullException("request"); if (!request.IsValid()) throw new ArgumentException("request"); var amount = GetAmount(request.Amount); var amountString = amount.ToString(); var sendData = new SortedList<string, string>(StringComparer.Ordinal); sendData.Add("nonce_str", Guid.NewGuid().ToString("N")); sendData.Add("mch_billno", request.BillNumber); sendData.Add("mch_id", m_MerchantId); sendData.Add("wxappid", request.AppId); sendData.Add("nick_name", request.SendName); //简单起见使用send_name。 sendData.Add("send_name", request.SendName); sendData.Add("re_openid", request.OpenId); sendData.Add("total_amount", amountString); sendData.Add("min_value", amountString); sendData.Add("max_value", amountString); sendData.Add("total_num", "1"); sendData.Add("wishing", request.Wishing); sendData.Add("client_ip", request.IpAddress); sendData.Add("act_name", request.ActName); sendData.Add("remark", request.Remark); var xml = DictionaryToXml(sendData); var result = await m_WeChatClient.PostAsync(xml); var result2 = Parse(result); result2.Amount = amount; result2.BillNumber = request.BillNumber; return result2; } public RedPacketSentResult Parse(string result) { try { var xml = XDocument.Parse(result).Root; var returnCode = xml.Element("return_code").Value; var balanceNotEnough = string.Equals(xml.Element("err_code").Value, "NOTENOUGH", StringComparison.OrdinalIgnoreCase); var error = balanceNotEnough ? RedPacketSentError.BalanceNotEnough : RedPacketSentError.Other; if (!string.Equals(returnCode, "SUCCESS", StringComparison.OrdinalIgnoreCase)) return new RedPacketSentResult { Succeeded = false, Response = result, Error = error }; var resultCode = xml.Element("result_code").Value; if (!string.Equals(resultCode, "SUCCESS", StringComparison.OrdinalIgnoreCase)) return new RedPacketSentResult { Succeeded = false, Response = result, Error = error }; return new RedPacketSentResult { Succeeded = true, Response = result }; ; } catch (Exception ex) { //Logger.WriteError("解析微信返回结果时发生错误", ex); return new RedPacketSentResult { Succeeded = false, Response = result, Error = RedPacketSentError.InternalError }; } } internal int GetAmount(int amount) { var maxAmount = 20000; if (amount == 0) return _Random.Next(100, maxAmount);//微信红包必须大于100分。 else { return amount > maxAmount ? maxAmount : amount; } } //默认情况下只能使用受信任的证书，此方法可以干预这个逻辑。 static bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors) { if (errors == SslPolicyErrors.None) return true; return false; } string Sign(IDictionary<string, string> dict) { StringBuilder sb = new StringBuilder(); foreach (var item in dict) { if (string.IsNullOrEmpty(item.Key) || string.IsNullOrEmpty(item.Value)) continue; sb.AppendFormat("{0}={1}&", item.Key, item.Value); } sb.Append("key=" m_PayKey); var bytesToHash = Encoding.UTF8.GetBytes(sb.ToString()); //注意，必须是UTF-8。 var hashResult = ComputeMD5Hash(bytesToHash); var hash = BytesToString(hashResult, false); return hash; } static byte[] ComputeMD5Hash(byte[] input) { if (input == null) throw new ArgumentNullException("input"); using (var md5 = new MD5CryptoServiceProvider()) { var result = md5.ComputeHash(input); return result; } } public static string BytesToString(byte[] input, bool lowercase = true) { if (input == null || input.Length == 0) return string.Empty; StringBuilder sb = new StringBuilder(input.Length * 2); for (var i = 0; i < input.Length; i ) { sb.AppendFormat(lowercase ? "{0:x2}" : "{0:X2}", input[i]); } return sb.ToString(); } string DictionaryToXml(IDictionary<string, string> dict) { StringBuilder sb = new StringBuilder(); sb.AppendLine("<xml>"); foreach (var item in dict) { if (string.IsNullOrEmpty(item.Key) || string.IsNullOrEmpty(item.Value)) continue; sb.AppendFormat("<{0}>{1}</{0}>", item.Key, item.Value); } var sign = Sign(dict); sb.AppendFormat("<sign>{0}</sign>", sign); sb.AppendLine("</xml>"); return sb.ToString(); } }}