企業微信應用程式開發WeChatAPI

純自主開發，用于與企業微信/企業号進行資料互動。

在企業微信背景建立應用程式，得到sCorpsScret
執行個體化WXApp.cs即可互動
如有不懂可私聊我~

WXApp.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace WeChatAPI
{
    /// <summary>
    /// 該類為通路企業微信/公衆号的通用類
    /// </summary>
    public class WXApp
    {
        string sCorpID;
        string sCorpsScret;
        Int32 sAgentID ;


        /// <summary>
        /// WXApp構造函數，每個微信App建立一個構造函數
        /// </summary>
        /// <param name="CorpID">CorpID</param>
        /// <param name="CorpsScret">CorpsScret</param>
        /// <param name="AgentID">AgentID, 應用ID</param>
        public WXApp(string CorpID, string CorpsScret, Int32 AgentID)
        {
            sCorpID = CorpID;
            sCorpsScret = CorpsScret;
            sAgentID = AgentID;
        }

        /// <summary>
        /// 擷取access_token
        /// </summary>
        private static string GetAccessToken(string CorpID, string CorpsScret)
        {
            string access_token = string.Empty;

            string strJson = HttpRequestUtil.RequestUrl_POST(string.Format("https://qyapi.weixin.qq.com/cgi-bin/gettoken?corpid={0}&corpsecret={1}", CorpID, CorpsScret));

            access_token = WXString.GetJsonValue(strJson, "access_token");

            return access_token;
        }

        /// <summary>
        /// 驗證Token是否過期
        /// </summary>
        private static bool TokenExpired(string access_token)
        {
            string jsonStr = HttpRequestUtil.RequestUrl_POST(string.Format("https://qyapi.weixin.qq.com/cgi-bin/menu/get?access_token={0}", access_token));
            if (WXString.GetJsonValue(jsonStr, "errcode") == "42001")
            {
                return true;
            }
            return false;
        }

        /// <summary> 
        /// 發送文本消息 
        /// </summary> 
        /// <param name="Message"></param> 
        /// <param name="fakeid"></param> 
        /// <returns></returns> 
        public bool SendMessage(out string strResult, string ToUser, string ToParty, string ToTag, string Message)
        {
            bool result = false;

            string responeJsonStr = WXString.ToJson(ToUser, ToParty, ToTag, "text", sAgentID, Message);

            //string responeJsonStr = WXString.ToJson(ToUser, ToParty, ToTag, MsgType, AgentID, Message, title, media_id, digest, show_cover_pic, safe);

            //responeJsonStr = combineResponsingInnerXml("text", "aeri;esrbhe", "22gLTua4IrIK1qof5GKjmOuE8fMgzFCJBQS-2HbaH2XHrJTAD2kU3XsLSSAAas2Dd", "WIP Queue");

            string token;
            token = GetAccessToken(sCorpID,sCorpsScret ) ;

            string url = string.Format("https://qyapi.weixin.qq.com/cgi-bin/message/send?access_token={0}", token);

            strResult = HttpRequestUtil.SendRequest(new Uri(url), responeJsonStr);

            if (strResult == "{\"errcode\":0,\"errmsg\":\"ok\"}")
            {
                result = true;
            }
            else
            {
                result = false;
            }
            return result;
        }

        public bool SendFile(out string strResult, string ToUser, string ToParty, string ToTag,string thumb_media_id)
        {
            bool result = false;

            string responeJsonStr = WXString.ToJson(ToUser, ToParty, ToTag, "file", sAgentID,"","", thumb_media_id);

            //responeJsonStr = combineResponsingInnerXml("text", "aeri;esrbhe", "22gLTua4IrIK1qof5GKjmOuE8fMgzFCJBQS-2HbaH2XHrJTAD2kU3XsLSSAAas2Dd", "WIP Queue");

            string token;
            token = GetAccessToken(sCorpID, sCorpsScret);

            string url = string.Format("https://qyapi.weixin.qq.com/cgi-bin/message/send?access_token={0}", token);

            strResult = HttpRequestUtil.SendRequest(new Uri(url), responeJsonStr);

            if (strResult == "{\"errcode\":0,\"errmsg\":\"ok\"}")
            {
                result = true;
            }
            else
            {
                result = false;
            }
            return result;
        }


        public bool SendMPNews(out string strResult, string ToUser, string ToParty, string ToTag, string Message,string title,string media_id, string digest ="",int show_cover_pic=0,int safe=1)
        {
            bool result = false;


            string responeJsonStr = WXString.ToJson(ToUser, ToParty, ToTag, "mpnews", sAgentID, Message, title, media_id, digest, show_cover_pic, safe);

            //responeJsonStr = combineResponsingInnerXml("text", "aeri;esrbhe", "22gLTua4IrIK1qof5GKjmOuE8fMgzFCJBQS-2HbaH2XHrJTAD2kU3XsLSSAAas2Dd", "WIP Queue");

            string token;
            token = GetAccessToken(sCorpID, sCorpsScret);

            string url = string.Format("https://qyapi.weixin.qq.com/cgi-bin/message/send?access_token={0}", token);

            strResult = HttpRequestUtil.SendRequest(new Uri(url), responeJsonStr);

            if (strResult == "{\"errcode\":0,\"errmsg\":\"ok\"}")
            {
                result = true;
            }
            else
            {
                result = false;
            }
            return result;
        }

        /// <summary> 
        /// 發送Media 
        /// </summary> 
        /// <param name="Message"></param> 
        /// <param name="fakeid"></param> 
        /// <returns></returns> 
        public bool SendMedia(out string strResult, out string Media_ID, string type, string filepath)
        {
            bool result = false;
            Media_ID = "";

            string token;
            token = GetAccessToken(sCorpID, sCorpsScret);

            string url = string.Format("https://qyapi.weixin.qq.com/cgi-bin/material/add_material?agentid={0}&type={1}&access_token={2}", sAgentID, type, token);

            strResult = HttpRequestUtil.SendRequest_File(new Uri(url), filepath);

            if (strResult.StartsWith("{\"errcode\":0,\"errmsg\":\"ok\",\"media_id\":"))
            {
                result = true;
                Media_ID = strResult.Substring(strResult.IndexOf("media_id\":\"") + 11, strResult.Length - strResult.IndexOf("media_id\":\"") - 11 - 2);
            }
            else
            {
                result = false;
            }
            return result;
        }

        /// <summary> 
        /// 上傳臨時Media 
        /// </summary> 
        /// <returns></returns> 
        public bool UploadTempMedia(out string strResult, out string Media_ID, string type, string filepath)
        {
            bool result = false;
            Media_ID = "";

            string token;
            token = GetAccessToken(sCorpID, sCorpsScret);

            string url = string.Format("https://qyapi.weixin.qq.com/cgi-bin/media/upload?access_token={0}&type={1}", token, type);

            strResult = HttpRequestUtil.SendRequest_File(new Uri(url), filepath);

            if (WXString.GetJsonValue(strResult, "type") == type)
            {
                result = true;
                Media_ID = WXString.GetJsonValue(strResult, "media_id");
            }
            else
            {
                result = false;
            }
            return result;
        }

        public string UploadTempMedia_ReturnMediaID(string type, string filepath)
        {
            string Media_ID = "";

            string token;
            token = GetAccessToken(sCorpID, sCorpsScret);

            string url = string.Format("https://qyapi.weixin.qq.com/cgi-bin/media/upload?access_token={0}&type={1}", token, type);

            string strResult = HttpRequestUtil.SendRequest_File(new Uri(url), filepath);

            if (WXString.GetJsonValue(strResult, "type") == type)
            {
                Media_ID = WXString.GetJsonValue(strResult, "media_id");
            }
            return Media_ID;
        }

        /// <summary> 
        /// 上傳永久Media；企業微信不支援上傳永久素材接口，公衆号則可以
        /// </summary> 
        /// <returns></returns> 
        public bool UploadMedia(out string strResult, out string Media_ID, Int32 AgentID, string type, string filepath)
        {
            bool result = false;
            Media_ID = "";

            string token;
            token = GetAccessToken(sCorpID, sCorpsScret);

            string url = string.Format("https://qyapi.weixin.qq.com/cgi-bin/material/add_material?agentid={0}&type={1}&access_token={2}", AgentID, type, token);

            strResult = HttpRequestUtil.SendRequest_File(new Uri(url), filepath);

            if (WXString.GetJsonValue(strResult, "errmsg") == "ok")
            {
                result = true;
                Media_ID = WXString.GetJsonValue(strResult, "media_id");
            }
            else
            {
                result = false;
            }
            return result;
        }


        /// <summary>
        /// 上傳圖檔，上傳後得到的URL永久有效，将永久儲存于微信伺服器
        /// </summary>
        /// <param name="strResult"></param>
        /// <param name="Image_Url"></param>
        /// <param name="filepath"></param>
        /// <param name="filename"></param>
        /// <returns></returns>
        public string UploadImage_Return_Image_Url(string filepath)
        {
            string Image_Url = "";

            string token;
            token = GetAccessToken(sCorpID, sCorpsScret);

            string url = string.Format("https://qyapi.weixin.qq.com/cgi-bin/media/uploadimg?access_token={0}", token);

            string strResult = HttpRequestUtil.SendRequest_File(new Uri(url), filepath);

            if (WXString.GetJsonValue(strResult, "errmsg").ToString().StartsWith("ok"))
            {
                Image_Url = WXString.GetJsonValue(strResult, "url");
            }
            return Image_Url;
        }

        public string Convert_to_userid(string openid)
        {
            string userid = "";

            string token;
            token = GetAccessToken(sCorpID, sCorpsScret);

            string url = string.Format("https://qyapi.weixin.qq.com/cgi-bin/user/convert_to_userid?access_token={0}", token);

            string strResult = HttpRequestUtil.SendRequest(new Uri(url), WXString.ToJson("openid", openid));

            if (WXString.GetJsonValue(strResult, "errmsg") == "ok")
            {
                userid = WXString.GetJsonValue(strResult, "userid");
            }
            else
            {
                userid = "error";
            }
            return userid;
        }

        public string Convert_to_openid(string userid)
        {
            string openid = "";

            string token;
            token = GetAccessToken(sCorpID, sCorpsScret);

            string url = string.Format("https://qyapi.weixin.qq.com/cgi-bin/user/convert_to_openid?access_token={0}", token);

            string strResult = HttpRequestUtil.SendRequest(new Uri(url), WXString.ToJson("userid", userid));

            if (WXString.GetJsonValue(strResult, "errmsg") == "ok")
            {
                openid = WXString.GetJsonValue(strResult, "openid");
            }
            else
            {
                openid = "error";
            }
            return openid;
        }
    }


}

HttpRequestUtil.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;

namespace WeChatAPI
{
   
    public class HttpRequestUtil
    {

        public static string RequestUrl_GET(string url)
        {
            return RequestUrl(url, "GET");
        }

        public static string RequestUrl_POST(string url)
        {
            return RequestUrl(url, "POST");
        }

        /// <summary>
        /// 請求Url，不發送資料
        /// </summary>
        public static string RequestUrl(string url)
        {
            return RequestUrl(url, "POST");
        }

        /// <summary>
        /// 請求Url，不發送資料
        /// </summary>
        public static string RequestUrl(string url, string method)
        {
            // 設定參數
            HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
            CookieContainer cookieContainer = new CookieContainer();
            request.CookieContainer = cookieContainer;
            request.AllowAutoRedirect = true;
            request.Method = method;
            request.ContentType = "text/html";
            request.Headers.Add("charset", "utf-8");

            //發送請求并擷取相應回應資料
            HttpWebResponse response = request.GetResponse() as HttpWebResponse;
            //直到request.GetResponse()程式才開始向目标網頁發送Post請求
            Stream responseStream = response.GetResponseStream();
            StreamReader sr = new StreamReader(responseStream, Encoding.UTF8);
            //傳回結果網頁（html）代碼
            string content = sr.ReadToEnd();
            return content;
        }

        public static string SendRequest(Uri uri, string body)
        {
            WebClient wc = new WebClient();
            Encoding enc = Encoding.UTF8;
            return enc.GetString(wc.UploadData(uri, enc.GetBytes(body)));
        }

        public static string SendRequest_File(Uri uri, string filepath)
        {
            WebClient wc = new WebClient();
            Encoding enc = Encoding.UTF8;
            return enc.GetString(wc.UploadFile(uri, filepath));

        }

        public static void WriteFile(string path, string body)
        {
            FileStream fs = new FileStream(path, FileMode.Append);
            StreamWriter sw = new StreamWriter(fs);
            //開始寫入
            sw.Write(body);
            //清空緩沖區
            sw.Flush();
            //關閉流
            sw.Close();
            fs.Close();
        }

        public static void WriteFile(string path, byte[] bytes)
        {
            FileStream fs = new FileStream(path, FileMode.Append);
            StreamWriter sw = new StreamWriter(fs);
            //開始寫入
            sw.Write(bytes);
            //清空緩沖區
            sw.Flush();
            //關閉流
            sw.Close();
            fs.Close();
        }

        //datetime轉換成unixtime
        public static int ConvertDateTimeInt(System.DateTime time)
        {
            System.DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(1970, 1, 1));
            return (int)(time - startTime).TotalSeconds;
        }
    }
 
}

騰訊庫：Cryptography.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Security.Cryptography;
using System.IO;
using System.Net;
namespace Tencent
{
    class Cryptography
    {
        public static UInt32 HostToNetworkOrder(UInt32 inval)
        {
            UInt32 outval = 0;
            for (int i = 0; i < 4; i++)
                outval = (outval << 8) + ((inval >> (i * 8)) & 255);
            return outval;
        }

        public static Int32 HostToNetworkOrder(Int32 inval)
        {
            Int32 outval = 0;
            for (int i = 0; i < 4; i++)
                outval = (outval << 8) + ((inval >> (i * 8)) & 255);
            return outval;
        }
        /// <summary>
        /// 解密方法
        /// </summary>
        /// <param name="Input">密文</param>
        /// <param name="EncodingAESKey"></param>
        /// <returns></returns>
        /// 
        public static string AES_decrypt(String Input, string EncodingAESKey, ref string corpid)
        {
            byte[] Key;
            Key = Convert.FromBase64String(EncodingAESKey + "=");
            byte[] Iv = new byte[16];
            Array.Copy(Key, Iv, 16);
            byte[] btmpMsg = AES_decrypt(Input, Iv, Key);

            int len = BitConverter.ToInt32(btmpMsg, 16);
            len = IPAddress.NetworkToHostOrder(len);


            byte[] bMsg = new byte[len];
            byte[] bCorpid = new byte[btmpMsg.Length - 20 - len];
            Array.Copy(btmpMsg, 20, bMsg, 0, len);
            Array.Copy(btmpMsg, 20+len , bCorpid, 0, btmpMsg.Length - 20 - len);
            string oriMsg = Encoding.UTF8.GetString(bMsg);
            corpid = Encoding.UTF8.GetString(bCorpid);

            
            return oriMsg;
        }

        public static String AES_encrypt(String Input, string EncodingAESKey, string corpid)
        {
            byte[] Key;
            Key = Convert.FromBase64String(EncodingAESKey + "=");
            byte[] Iv = new byte[16];
            Array.Copy(Key, Iv, 16);
            string Randcode = CreateRandCode(16);
            byte[] bRand = Encoding.UTF8.GetBytes(Randcode);
            byte[] bCorpid = Encoding.UTF8.GetBytes(corpid);
            byte[] btmpMsg = Encoding.UTF8.GetBytes(Input);
            byte[] bMsgLen = BitConverter.GetBytes(HostToNetworkOrder(btmpMsg.Length));
            byte[] bMsg = new byte[bRand.Length + bMsgLen.Length + bCorpid.Length + btmpMsg.Length];

            Array.Copy(bRand, bMsg, bRand.Length);
            Array.Copy(bMsgLen, 0, bMsg, bRand.Length, bMsgLen.Length);
            Array.Copy(btmpMsg, 0, bMsg, bRand.Length + bMsgLen.Length, btmpMsg.Length);
            Array.Copy(bCorpid, 0, bMsg, bRand.Length + bMsgLen.Length + btmpMsg.Length, bCorpid.Length);
   
            return AES_encrypt(bMsg, Iv, Key);

        }
        private static string CreateRandCode(int codeLen)
        {
            string codeSerial = "2,3,4,5,6,7,a,c,d,e,f,h,i,j,k,m,n,p,r,s,t,A,C,D,E,F,G,H,J,K,M,N,P,Q,R,S,U,V,W,X,Y,Z";
            if (codeLen == 0)
            {
                codeLen = 16;
            }
            string[] arr = codeSerial.Split(',');
            string code = "";
            int randValue = -1;
            Random rand = new Random(unchecked((int)DateTime.Now.Ticks));
            for (int i = 0; i < codeLen; i++)
            {
                randValue = rand.Next(0, arr.Length - 1);
                code += arr[randValue];
            }
            return code;
        }

        private static String AES_encrypt(String Input, byte[] Iv, byte[] Key)
        {
            var aes = new RijndaelManaged();
            //秘鑰的大小，以位為機關
            aes.KeySize = 256;
            //支援的塊大小
            aes.BlockSize = 128;
            //填充模式
            aes.Padding = PaddingMode.PKCS7;
            aes.Mode = CipherMode.CBC;
            aes.Key = Key;
            aes.IV = Iv;
            var encrypt = aes.CreateEncryptor(aes.Key, aes.IV);
            byte[] xBuff = null;

            using (var ms = new MemoryStream())
            {
                using (var cs = new CryptoStream(ms, encrypt, CryptoStreamMode.Write))
                {
                    byte[] xXml = Encoding.UTF8.GetBytes(Input);
                    cs.Write(xXml, 0, xXml.Length);
                }
                xBuff = ms.ToArray();
            }
            String Output = Convert.ToBase64String(xBuff);
            return Output;
        }

        private static String AES_encrypt(byte[] Input, byte[] Iv, byte[] Key)
        {
            var aes = new RijndaelManaged();
            //秘鑰的大小，以位為機關
            aes.KeySize = 256;
            //支援的塊大小
            aes.BlockSize = 128;
            //填充模式
            //aes.Padding = PaddingMode.PKCS7;
            aes.Padding = PaddingMode.None;
            aes.Mode = CipherMode.CBC;
            aes.Key = Key;
            aes.IV = Iv;
            var encrypt = aes.CreateEncryptor(aes.Key, aes.IV);
            byte[] xBuff = null;

            #region 自己進行PKCS7補位，用系統自己帶的不行
            byte[] msg = new byte[Input.Length + 32 - Input.Length % 32];
            Array.Copy(Input, msg, Input.Length);
            byte[] pad = KCS7Encoder(Input.Length);
            Array.Copy(pad, 0, msg, Input.Length, pad.Length);
            #endregion

            #region 注釋的也是一種方法，效果一樣
            //ICryptoTransform transform = aes.CreateEncryptor();
            //byte[] xBuff = transform.TransformFinalBlock(msg, 0, msg.Length);
            #endregion

            using (var ms = new MemoryStream())
            {
                using (var cs = new CryptoStream(ms, encrypt, CryptoStreamMode.Write))
                {
                    cs.Write(msg, 0, msg.Length);
                }
                xBuff = ms.ToArray();
            }

            String Output = Convert.ToBase64String(xBuff);
            return Output;
        }

        private static byte[] KCS7Encoder(int text_length)
        {
            int block_size = 32;
            // 計算需要填充的位數
            int amount_to_pad = block_size - (text_length % block_size);
            if (amount_to_pad == 0)
            {
                amount_to_pad = block_size;
            }
            // 獲得補位所用的字元
            char pad_chr = chr(amount_to_pad);
            string tmp = "";
            for (int index = 0; index < amount_to_pad; index++)
            {
                tmp += pad_chr;
            }
            return Encoding.UTF8.GetBytes(tmp);
        }
        /**
         * 将數字轉化成ASCII碼對應的字元，用于對明文進行補碼
         * 
         * @param a 需要轉化的數字
         * @return 轉化得到的字元
         */
        static char chr(int a)
        {

            byte target = (byte)(a & 0xFF);
            return (char)target;
        }
        private static byte[] AES_decrypt(String Input, byte[] Iv, byte[] Key)
        {
            RijndaelManaged aes = new RijndaelManaged();
            aes.KeySize = 256;
            aes.BlockSize = 128;
            aes.Mode = CipherMode.CBC;
            aes.Padding = PaddingMode.None;
            aes.Key = Key;
            aes.IV = Iv;
            var decrypt = aes.CreateDecryptor(aes.Key, aes.IV);
            byte[] xBuff = null;
            using (var ms = new MemoryStream())
            {
                using (var cs = new CryptoStream(ms, decrypt, CryptoStreamMode.Write))
                {
                    byte[] xXml = Convert.FromBase64String(Input);
                    byte[] msg = new byte[xXml.Length + 32 - xXml.Length % 32];
                    Array.Copy(xXml, msg, xXml.Length);
                    cs.Write(xXml, 0, xXml.Length);
                }
                xBuff = decode2(ms.ToArray());
            }
            return xBuff;
        }
        private static byte[] decode2(byte[] decrypted)
        {
            int pad = (int)decrypted[decrypted.Length - 1];
            if (pad < 1 || pad > 32)
            {
                pad = 0;
            }
            byte[] res = new byte[decrypted.Length - pad];
            Array.Copy(decrypted, 0, res, 0, decrypted.Length - pad);
            return res;
        }
    }
}

騰訊庫：WXBizMsgCrypt.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml;
using System.Collections;
//using System.Web;
using System.Security.Cryptography;
//-40001 ： 簽名驗證錯誤
//-40002 :  xml解析失敗
//-40003 :  sha加密生成簽名失敗
//-40004 :  AESKey 非法
//-40005 :  corpid 校驗錯誤
//-40006 :  AES 加密失敗
//-40007 ： AES 解密失敗
//-40008 ： 解密後得到的buffer非法
//-40009 :  base64加密異常
//-40010 :  base64解密異常
namespace Tencent
{
    class WXBizMsgCrypt
    {
        string m_sToken;
        string m_sEncodingAESKey;
        string m_sCorpID;
        enum WXBizMsgCryptErrorCode
        {
            WXBizMsgCrypt_OK = 0,
            WXBizMsgCrypt_ValidateSignature_Error = -40001,
            WXBizMsgCrypt_ParseXml_Error = -40002,
            WXBizMsgCrypt_ComputeSignature_Error = -40003,
            WXBizMsgCrypt_IllegalAesKey = -40004,
            WXBizMsgCrypt_ValidateCorpid_Error = -40005,
            WXBizMsgCrypt_EncryptAES_Error = -40006,
            WXBizMsgCrypt_DecryptAES_Error = -40007,
            WXBizMsgCrypt_IllegalBuffer = -40008,
            WXBizMsgCrypt_EncodeBase64_Error = -40009,
            WXBizMsgCrypt_DecodeBase64_Error = -40010
        };

        //構造函數
	    // @param sToken: 公衆平台上，開發者設定的Token
	    // @param sEncodingAESKey: 公衆平台上，開發者設定的EncodingAESKey
	    // @param sCorpID: 企業号的CorpID
        public WXBizMsgCrypt(string sToken, string sEncodingAESKey, string sCorpID)
        {
            m_sToken = sToken;
            m_sCorpID = sCorpID;
            m_sEncodingAESKey = sEncodingAESKey;
        }

        //驗證URL
        // @param sMsgSignature: 簽名串，對應URL參數的msg_signature
        // @param sTimeStamp: 時間戳，對應URL參數的timestamp
        // @param sNonce: 随機串，對應URL參數的nonce
        // @param sEchoStr: 随機串，對應URL參數的echostr
        // @param sReplyEchoStr: 解密之後的echostr，當return傳回0時有效
        // @return：成功0，失敗傳回對應的錯誤碼
        public int VerifyURL(string sMsgSignature, string sTimeStamp, string sNonce, string sEchoStr, ref string sReplyEchoStr)
        {
            int ret = 0;
			if (m_sEncodingAESKey.Length!=43)
			{
				return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_IllegalAesKey;
			}
            ret = VerifySignature(m_sToken, sTimeStamp, sNonce, sEchoStr, sMsgSignature);
            if (0 != ret)
            {
                return ret;
            }
            sReplyEchoStr = "";
            string cpid = "";
            try
            {
                sReplyEchoStr = Cryptography.AES_decrypt(sEchoStr, m_sEncodingAESKey, ref cpid); //m_sCorpID);
            }
            catch (Exception)
            {
                sReplyEchoStr = "";
                return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_DecryptAES_Error;
            }
            if (cpid != m_sCorpID)
            {
                sReplyEchoStr = "";
                return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_ValidateCorpid_Error;
            }
            return 0;
        }

        // 檢驗消息的真實性，并且擷取解密後的明文
        // @param sMsgSignature: 簽名串，對應URL參數的msg_signature
        // @param sTimeStamp: 時間戳，對應URL參數的timestamp
        // @param sNonce: 随機串，對應URL參數的nonce
        // @param sPostData: 密文，對應POST請求的資料
        // @param sMsg: 解密後的原文，當return傳回0時有效
        // @return: 成功0，失敗傳回對應的錯誤碼
        public int DecryptMsg(string sMsgSignature, string sTimeStamp, string sNonce, string sPostData, ref string sMsg)
        {
			if (m_sEncodingAESKey.Length!=43)
			{
				return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_IllegalAesKey;
			}
            XmlDocument doc = new XmlDocument();
            XmlNode root;
            string sEncryptMsg;
            try
            {
                doc.LoadXml(sPostData);
                root = doc.FirstChild;
                sEncryptMsg = root["Encrypt"].InnerText;
            }
            catch (Exception)
            {
                return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_ParseXml_Error;
            }
            //verify signature
            int ret = 0;
            ret = VerifySignature(m_sToken, sTimeStamp, sNonce, sEncryptMsg, sMsgSignature);
            if (ret != 0)
                return ret;
            //decrypt
            string cpid = "";
            try
            {
                sMsg = Cryptography.AES_decrypt(sEncryptMsg, m_sEncodingAESKey, ref cpid);
            }
            catch (FormatException)
            {
                sMsg = "";
                return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_DecodeBase64_Error;
            }
            catch (Exception)
            {
                sMsg = "";
                return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_DecryptAES_Error;
            }
            if (cpid != m_sCorpID)
                return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_ValidateCorpid_Error;
            return 0;
        }

        //将企業号回複使用者的消息加密打包
        // @param sReplyMsg: 企業号待回複使用者的消息，xml格式的字元串
        // @param sTimeStamp: 時間戳，可以自己生成，也可以用URL參數的timestamp
        // @param sNonce: 随機串，可以自己生成，也可以用URL參數的nonce
        // @param sEncryptMsg: 加密後的可以直接回複使用者的密文，包括msg_signature, timestamp, nonce, encrypt的xml格式的字元串,
        //						當return傳回0時有效
        // return：成功0，失敗傳回對應的錯誤碼
        public int EncryptMsg(string sReplyMsg, string sTimeStamp, string sNonce, ref string sEncryptMsg)
        {
			if (m_sEncodingAESKey.Length!=43)
			{
				return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_IllegalAesKey;
			}
            string raw = "";
            try
            {
                raw = Cryptography.AES_encrypt(sReplyMsg, m_sEncodingAESKey, m_sCorpID);
            }
            catch (Exception)
            {
                return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_EncryptAES_Error;
            }
            string MsgSigature = "";
            int ret = 0;
            ret = GenarateSinature(m_sToken, sTimeStamp, sNonce, raw, ref MsgSigature);
            if (0 != ret)
                return ret;
            sEncryptMsg = "";

            string EncryptLabelHead = "<Encrypt><![CDATA[";
            string EncryptLabelTail = "]]></Encrypt>";
            string MsgSigLabelHead = "<MsgSignature><![CDATA[";
            string MsgSigLabelTail = "]]></MsgSignature>";
            string TimeStampLabelHead = "<TimeStamp><![CDATA[";
            string TimeStampLabelTail = "]]></TimeStamp>";
            string NonceLabelHead = "<Nonce><![CDATA[";
            string NonceLabelTail = "]]></Nonce>";
            sEncryptMsg = sEncryptMsg + "<xml>" + EncryptLabelHead + raw + EncryptLabelTail;
            sEncryptMsg = sEncryptMsg + MsgSigLabelHead + MsgSigature + MsgSigLabelTail;
            sEncryptMsg = sEncryptMsg + TimeStampLabelHead + sTimeStamp + TimeStampLabelTail;
            sEncryptMsg = sEncryptMsg + NonceLabelHead + sNonce + NonceLabelTail;
            sEncryptMsg += "</xml>";
            return 0;
        }

        public class DictionarySort : System.Collections.IComparer
        {
            public int Compare(object oLeft, object oRight)
            {
                string sLeft = oLeft as string;
                string sRight = oRight as string;
                int iLeftLength = sLeft.Length;
                int iRightLength = sRight.Length;
                int index = 0;
                while (index < iLeftLength && index < iRightLength)
                {
                    if (sLeft[index] < sRight[index])
                        return -1;
                    else if (sLeft[index] > sRight[index])
                        return 1;
                    else
                        index++;
                }
                return iLeftLength - iRightLength;

            }
        }
        //Verify Signature
        private static int VerifySignature(string sToken, string sTimeStamp, string sNonce, string sMsgEncrypt, string sSigture)
        {
            string hash = "";
            int ret = 0;
            ret = GenarateSinature(sToken, sTimeStamp, sNonce, sMsgEncrypt, ref hash);
            if (ret != 0)
                return ret;
            if (hash == sSigture)
                return 0;
            else
            {
                return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_ValidateSignature_Error;
            }
        }

        public static int GenarateSinature(string sToken, string sTimeStamp, string sNonce, string sMsgEncrypt ,ref string sMsgSignature)
        {
            ArrayList AL = new ArrayList();
            AL.Add(sToken);
            AL.Add(sTimeStamp);
            AL.Add(sNonce);
            AL.Add(sMsgEncrypt);
            AL.Sort(new DictionarySort());
            string raw = "";
            for (int i = 0; i < AL.Count; ++i)
            {
                raw += AL[i];
            }

            SHA1 sha;
            ASCIIEncoding enc;
            string hash = "";
            try
            {
                sha = new SHA1CryptoServiceProvider();
                enc = new ASCIIEncoding();
                byte[] dataToHash = enc.GetBytes(raw);
                byte[] dataHashed = sha.ComputeHash(dataToHash);
                hash = BitConverter.ToString(dataHashed).Replace("-", "");
                hash = hash.ToLower();
            }
            catch (Exception)
            {
                return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_ComputeSignature_Error;
            }
            sMsgSignature = hash;
            return 0;
        }
    }
}

WXString.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace WeChatAPI
{
    class WXString
    {

        /// <summary>
        /// 自動生成Json
        /// </summary>
        /// <param name="touser"></param>
        /// <param name="toparty"></param>
        /// <param name="totag"></param>
        /// <param name="msgtype"></param>
        /// <param name="agentid"></param>
        /// <param name="content"></param>
        /// <param name="safe"></param>
        /// <returns></returns>
        public static string ToJson(string touser, string toparty, string totag, string msgtype, Int32 agentid, string content, Int32 safe = 0)
        {
            // 生成 "text"="xxx" 的JSON
            string responeJsonStr = "{";
            if (!string.IsNullOrEmpty(touser))
            {
                responeJsonStr += "\"touser\": \"" + touser + "\",";
            }
            if (!string.IsNullOrEmpty(toparty))
            {
                responeJsonStr += "\"toparty\": \"" + toparty + "\",";
            }
            if (!string.IsNullOrEmpty(totag))
            {
                responeJsonStr += "\"totag\": \"" + totag + "\",";
            }
            responeJsonStr += "\"msgtype\": \"" + msgtype + "\",";
            responeJsonStr += "\"agentid\": \"" + agentid + "\",";
            responeJsonStr += "\"text\": {";
            responeJsonStr += "  \"content\": \"" + content + "\"";
            responeJsonStr += "},";
            responeJsonStr += "\"safe\":\"" + safe + "\"";
            responeJsonStr += "}";
            return responeJsonStr;
        }

        public static string ToJson(string touser, string toparty, string totag, string msgtype, Int32 agentid, string content, string title, string thumb_media_id, string digest = "", int show_cover_pic = 0,Int32 safe = 0)
        {
            // 生成 "text"="xxx" 的JSON
            string responeJsonStr = "{";
            if (!string.IsNullOrEmpty(touser))
            {
                responeJsonStr += "\"touser\": \"" + touser + "\",";
            }
            if (!string.IsNullOrEmpty(toparty))
            {
                responeJsonStr += "\"toparty\": \"" + toparty + "\",";
            }
            if (!string.IsNullOrEmpty(totag))
            {
                responeJsonStr += "\"totag\": \"" + totag + "\",";
            }
            responeJsonStr += "\"msgtype\": \"" + msgtype + "\",";
            responeJsonStr += "\"agentid\": \"" + agentid + "\",";

            if (msgtype == "text")
            {
                responeJsonStr += "\"text\": {";
                responeJsonStr += "  \"content\": \"" + content + "\"";
                responeJsonStr += "},";
                responeJsonStr += "\"safe\":\"" + safe + "\"";
                responeJsonStr += "}";
            }
            if (msgtype == "image")
            {

                responeJsonStr += "\"image\": {";
                responeJsonStr += "  \"media_id\": \"" + thumb_media_id + "\"";
                responeJsonStr += "},";
                responeJsonStr += "\"safe\":\"" + safe + "\"";
                responeJsonStr += "}";
            }
            if (msgtype == "file")
            {

                responeJsonStr += "\"file\": {";
                responeJsonStr += "  \"media_id\": \"" + thumb_media_id + "\"";
                responeJsonStr += "},";
                responeJsonStr += "\"safe\":\"" + safe + "\"";
                responeJsonStr += "}";
            }
            else
            {
                responeJsonStr += "\"mpnews\": {";
                responeJsonStr += "  \"articles\":[";
                responeJsonStr += " {";
                responeJsonStr += " \"title\": \"" + title + "\",";
                responeJsonStr += " \"thumb_media_id\": \"" + thumb_media_id + "\",";
                responeJsonStr += " \"content\": \"" + content + "\",";
                if (!string.IsNullOrEmpty(digest))
                { responeJsonStr += " \"digest\": \"" + digest + "\","; }
                responeJsonStr += " \"show_cover_pic\": \"" + show_cover_pic + "\",";
                responeJsonStr += " }";
                responeJsonStr += " ]";
                responeJsonStr += "},";
                responeJsonStr += "\"safe\":\"" + safe + "\"";
                responeJsonStr += "}";
            }

            return responeJsonStr;
        }

        /// <summary>
        /// 根據Dictionary生成Json
        /// </summary>
        /// <param name="dic"></param>
        /// <returns></returns>
        public static string ToJson(Dictionary<string, string> dic)
        {
            string responeJsonStr = "{";
            foreach (string strKey in dic.Keys)
            {
                responeJsonStr += "\"" + strKey + "\": \"" + dic[strKey] + "\",";
            }
            responeJsonStr = responeJsonStr.TrimEnd(',');
            responeJsonStr += "}";
            return responeJsonStr;
        }

        //隻有一個key和value時，生成Json
        public static string ToJson(string key, string value)
        {
            string responeJsonStr = "{";
            responeJsonStr += "\"" + key + "\": \"" + value + "\"";
            responeJsonStr += "}";
            return responeJsonStr;
        }

        /// <summary>
        /// 擷取Json字元串某節點的值
        /// </summary>
        public static string GetJsonValue(string jsonStr, string key)
        {
            string result = string.Empty;
            if (!string.IsNullOrEmpty(jsonStr))
            {
                key = "\"" + key.Trim('"') + "\"";
                int index = jsonStr.IndexOf(key) + key.Length + 1;
                if (index > key.Length + 1)
                {
                    //先截逗号，若是最後一個，截“｝”号，取最小值
                    int end = jsonStr.IndexOf(',', index);
                    if (end == -1)
                    {
                        end = jsonStr.IndexOf('}', index);
                    }

                    result = jsonStr.Substring(index, end - index);
                    result = result.Trim(new char[] { '"', ' ', '\'' }); //過濾引号或空格
                }
            }
            return result;
        }

        public static string combineResponsingInnerXml(string MsgType, string Content = "", string MediaId = "", string Title = "")
        {
            string strMsgType = "<MsgType><![CDATA[" + MsgType + "]]></MsgType>";
            if (MsgType == "text")
            {
                return strMsgType + "<Content><![CDATA[" + Content + "]]></Content>";
            }
            else if (MsgType == "image")
            {
                return strMsgType + "<Image><MediaId><![CDATA[" + MediaId + "]]></MediaId></Image>";
            }
            else if (MsgType == "voice")
            {
                return strMsgType + "<Voice><MediaId><![CDATA[" + MediaId + "]]></MediaId></Voice>";
            }
            else if (MsgType == "mpnews")
            {
                return strMsgType + "<mpnews><Articles><Title><![CDATA[" + Title + "]]></Title><Thumb_Media_Id><![CDATA[" + MediaId + "]]></Thumb_Media_Id><Content><![CDATA[" + Content + "]]></Content></Articles></mpnews>";
            }
            else
            {
                return "";
            }

        }
    }
}

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