protected string Sign(string message)     {                      X509Certificate2 cert = new X509Certificate2(@"p12证书路径", 商户ID, X509KeyStorageFlags.MachineKeySet | X509KeyStorageFlags.PersistKeySet | X509KeyStorageFlags.Exportable);         var privateKey = cert.PrivateKey.ToXmlString(true);         var certSerialNo = cert.SerialNumber;                 using (RSACryptoServiceProvider sha256 = new RSACryptoServiceProvider())         {             byte[] dataInBytes = Encoding.UTF8.GetBytes(message);             sha256.FromXmlString(privateKey);             byte[] inArray = sha256.SignData(dataInBytes, CryptoConfig.MapNameToOID("SHA256"));             string sign = Convert.ToBase64String(inArray);             return sign;                     }     } 万分感谢 peng 大佬的帮助。此处记录下解决方法

这个问题解决了吗？我也遇到这个问题了。若解决了，麻烦留言回复下，谢谢。