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        //获取签名var Token= BuildAuthAsync("GET", body, URL);/// <summary>/// 构造签名串/// </summary>/// <param name="method">HTTP请求方式（全大写）</param>/// <param name="body">API接口请求参数的json字符串</param>/// <param name="uri">API接口的相对路径</param>/// <returns></returns>protected string BuildAuthAsync(string method, string body, string uri){var timestamp = DateTimeOffset.Now.ToUnixTimeSeconds();string nonce = Path.GetRandomFileName();string message = $"{method}\n{uri}\n{timestamp}\n{nonce}\n{body}\n";string signature = RequestSign(message);times = timestamp.ToString();noncerodom = nonce;sign = signature;return $"mchid=\"{mchid}\",nonce_str=\"{nonce}\",timestamp=\"{timestamp}\",serial_no=\"{serial_no}\",signature=\"{signature}\"";}/// <summary>/// 生成签名/// </summary>/// <param name="message"></param>/// <returns></returns>protected string RequestSign(string message){//加载证书 _apiCertPath API证书物理路径 _certPwd API证书密码（默认是商户号）X509Certificate2 cer = new X509Certificate2("../../File/1628286360_20231122_cert/apiclient_cert.p12", mchid, X509KeyStorageFlags.Exportable);if (cer != null){RSA rsa = cer.GetRSAPrivateKey();//获取私钥//查看在不同平台上的具体类型byte[] data = Encoding.UTF8.GetBytes(message);return Convert.ToBase64String(rsa.SignData(data, HashAlgorithmName.SHA256, RSASignaturePadding.Pkcs1));}else{return "";}}