/// <summary>/// 验证微信签名/// </summary>/// * 将token、timestamp、nonce三个参数进行字典序排序/// * 将三个参数字符串拼接成一个字符串进行sha1加密/// * 开发者获得加密后的字符串可与signature对比，标识该请求来源于微信。/// <returns></returns>[HttpGet]public ActionResult WeChatCheck(string signature, string timestamp, string nonce, string echostr, string token){ string[] ArrTmp = { "wechat", timestamp, nonce }; //字典排序 Array.Sort(ArrTmp); string tmpStr = string.Join("", ArrTmp); //字符加密 var sha1 = HmacSha1Sign(tmpStr); if (sha1.Equals(signature)) { return Content(echostr); } else { return null; }}/// <summary>/// HMAC-SHA1加密算法/// </summary>/// <param name="str">加密字符串</param>/// <returns></returns>public string HmacSha1Sign(string str){ var sha1 = System.Security.Cryptography.SHA1.Create(); var hash = sha1.ComputeHash(Encoding.Default.GetBytes(str)); string byte2String = null; for (int i = 0; i < hash.Length; i++) { byte2String += hash[i].ToString("x2"); } return byte2String;}