虽然没有错误，但解密不会解密数据

Question

我是加密概念的新手。我试图使用AES加密来加密似乎工作正常的文件。但是当我使用解密时，我没有错误，但数据没有被解密。解密代码在

之下

public static string DecryptData(string sFileInPath, byte[] Key, byte[] IV)
{
    String data = null;

    byte[] file = File.ReadAllBytes(sFileInPath);

    if (!File.Exists(sFileInPath))
        throw new ArgumentNullException("FilenotExists");
    if (Key == null || Key.Length <= 0)
        throw new ArgumentNullException("Key");
    if (IV == null || IV.Length <= 0)
        throw new ArgumentNullException("Key");
    try
    {
        using (AesCryptoServiceProvider aesAlg = new AesCryptoServiceProvider())
        {
            aesAlg.Padding = PaddingMode.None;
            aesAlg.Key = Key;
            aesAlg.IV = IV;
            aesAlg.Mode = CipherMode.CBC;

            ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV);

            MemoryStream ms = new MemoryStream();

            using (var cs = new CryptoStream(ms, decryptor, CryptoStreamMode.Write))
            {
                cs.Write(file, 0, file.Length);
                cs.Close();
            }

            data = Encoding.Unicode.GetString(ms.ToArray());

            msDecrypt.Close();
        }

        return data;
    }

    catch (Exception ex)
    {
        string status = string.Format("{0}: {1}", statustype.Failed.ToString(), ex.ToString());
        return status;
    }
}

调用解密方法

AesCryptoServiceProvider oAes = new AesCryptoServiceProvider();
string xml = Utility.DecryptData_AES(sfile,oAes.Key,oAes.IV);

加密方法：

   public static byte[] EncryptData(AlertEnvelope alertenvelope, byte[] Key, byte[] IV)
    {

        if (alertenvelope == null)
            throw new ArgumentNullException("alertenvelope");
        if (Key == null || Key.Length <= 0)
            throw new ArgumentNullException("Key");
        if (IV == null || IV.Length <= 0)
            throw new ArgumentNullException("Key");
        byte[] encrypted;

        using (AesCryptoServiceProvider aesAlg = new AesCryptoServiceProvider())
        {
            aesAlg.Padding = PaddingMode.PKCS7;
            aesAlg.Key = Key;
            aesAlg.IV = IV;


            ICryptoTransform encryptor = aesAlg.CreateEncryptor(aesAlg.Key, aesAlg.IV);


            using (MemoryStream msEncrypt = new MemoryStream())
            {
                using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
                {
                    using (StreamWriter swEncrypt = new StreamWriter(csEncrypt))
                    {
                        //Write all data to the stream.
                        swEncrypt.Write(alertenvelope);
                    }

                    encrypted = msEncrypt.ToArray();
             }
            }
        }


        return encrypted;

    }

如果有人能帮助我理解数据未被解密的原因，我将不胜感激