byte[] encryptedData = Convert.FromBase64String(edata);  // strToToHexByte(text);

                RijndaelManaged rijndaelCipher = new RijndaelManaged();

                rijndaelCipher.Key = Convert.FromBase64String(aesKey); // Encoding.UTF8.GetBytes(AesKey);

                rijndaelCipher.IV = Convert.FromBase64String(iv);// Encoding.UTF8.GetBytes(AesIV);

                rijndaelCipher.Mode = CipherMode.CBC;

                rijndaelCipher.Padding = PaddingMode.PKCS7;

                ICryptoTransform transform = rijndaelCipher.CreateDecryptor();

                byte[] plainText = transform.TransformFinalBlock(encryptedData, 0, encryptedData.Length);

                var result = Encoding.UTF8.GetString(plainText);

代码如上  解密出现

填充无效，无法被移除。

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解密用户手机号没有问题