JS解密方法转换为C#

function aesDecrypt(encryptedData, key, iv) {
  var decipher = crypto.createDecipheriv('aes-256-cbc', key, iv);
  var decrypted = decipher.update(encryptedData, 'base64', 'utf8');
  decrypted += decipher.final('utf8');
  return decrypted;
}

var encryptedData = "encrypted data";
var key = "encryption key";
var iv = "initialization vector";

var decryptedData = aesDecrypt(encryptedData, key, iv);
console.log(decryptedData);

using System;
using System.Security.Cryptography;
using System.Text;

public class AesHelper
{
    public static string AesDecrypt(string encryptedData, string key, string iv)
    {
        using (var aes = new AesCryptoServiceProvider())
        {
            aes.Key = Encoding.UTF8.GetBytes(key);
            aes.IV = Encoding.UTF8.GetBytes(iv);

            var decryptor = aes.CreateDecryptor(aes.Key, aes.IV);

            byte[] encryptedBytes = Convert.FromBase64String(encryptedData);
            byte[] decryptedBytes = decryptor.TransformFinalBlock(encryptedBytes, 0, encryptedBytes.Length);

            return Encoding.UTF8.GetString(decryptedBytes);
        }
    }
}

public class Program
{
    public static void Main()
    {
        string encryptedData = "encrypted data";
        string key = "encryption key";
        string iv = "initialization vector";

        string decryptedData = AesHelper.AesDecrypt(encryptedData, key, iv);
        Console.WriteLine(decryptedData);
    }
}