在C#中自动加密文件？

using System;
using System.IO;
using System.Security.Cryptography;

public static string EncryptFile(string inputFile, string key)
{
    byte[] keyBytes = Convert.FromBase64String(key);
    byte[] ivBytes = new byte[16];
    byte[] buffer = new byte[1024];
    int readBytes;

    using (var aes = Aes.Create())
    using (var inputStream = File.OpenRead(inputFile))
    using (var outputStream = File.OpenWrite($"{inputFile}.encrypted"))
    using (var encryptor = aes.CreateEncryptor(keyBytes, ivBytes))
    using (var cryptoStream = new CryptoStream(outputStream, encryptor, CryptoStreamMode.Write))
    {
        while ((readBytes = inputStream.Read(buffer, 0, buffer.Length)) > 0)
        {
            cryptoStream.Write(buffer, 0, readBytes);
        }
    }

    return $"{inputFile}.encrypted";
}

public static string DecryptFile(string inputFile, string key)
{
    byte[] keyBytes = Convert.FromBase64String(key);
    byte[] ivBytes = new byte[16];
    byte[] buffer = new byte[1024];
    int readBytes;

    using (var aes = Aes.Create())
    using (var inputStream = File.OpenRead(inputFile))
    using (var outputStream = File.OpenWrite($"{inputFile}.decrypted"))
    using (var decryptor = aes.CreateDecryptor(keyBytes, ivBytes))
    using (var cryptoStream = new CryptoStream(inputStream, decryptor, CryptoStreamMode.Read))
    {
        while ((readBytes = cryptoStream.Read(buffer, 0, buffer.Length)) > 0)
        {
            outputStream.Write(buffer, 0, readBytes);
        }
    }

    return $"{inputFile}.decrypted";
}

string inputFile = "example.txt";
string key = "your-base64-encoded-key";

string encryptedFile = EncryptFile(inputFile, key);
string decryptedFile = DecryptFile(encryptedFile, key);