class Program
    {
        private static string key = "1234567890123456"; // 16字節(jié)密鑰，AES-128
        private static string iv = "1234567890123456";  // 16字節(jié)IV（初始化向量）
 
        // 加密函數(shù)
        public static string Encrypt(string plainText)
        {
            using (Aes aesAlg = Aes.Create()) // 創(chuàng)建AES加密實(shí)例
            {
                aesAlg.Key = Encoding.UTF8.GetBytes(key);  // 設(shè)置密鑰
                aesAlg.IV = Encoding.UTF8.GetBytes(iv);    // 設(shè)置初始化向量
 
                ICryptoTransform encryptor = aesAlg.CreateEncryptor(aesAlg.Key, aesAlg.IV); // 創(chuàng)建加密器
 
                using (MemoryStream msEncrypt = new MemoryStream())  // 用于存儲(chǔ)加密后的數(shù)據(jù)
                {
                    using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))  // 創(chuàng)建加密數(shù)據(jù)流
                    {
                        using (StreamWriter swEncrypt = new StreamWriter(csEncrypt))  // 寫入加密流
                        {
                            swEncrypt.Write(plainText);  // 寫入明文數(shù)據(jù)
                        }
                    }
                    // 返回加密后的數(shù)據(jù)，轉(zhuǎn)換為Base64字符串
                    return Convert.ToBase64String(msEncrypt.ToArray());
                }
            }
        }
 
        // 解密函數(shù)
        public static string Decrypt(string cipherText)
        {
            using (Aes aesAlg = Aes.Create()) // 創(chuàng)建AES實(shí)例
            {
                aesAlg.Key = Encoding.UTF8.GetBytes(key);  // 設(shè)置密鑰
                aesAlg.IV = Encoding.UTF8.GetBytes(iv);    // 設(shè)置初始化向量
 
                ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV);  // 創(chuàng)建解密器
 
                using (MemoryStream msDecrypt = new MemoryStream(Convert.FromBase64String(cipherText)))  // 將Base64字符串轉(zhuǎn)換為字節(jié)數(shù)組并讀取
                {
                    using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))  // 創(chuàng)建解密數(shù)據(jù)流
                    {
                        using (StreamReader srDecrypt = new StreamReader(csDecrypt))  // 從解密流中讀取數(shù)據(jù)
                        {
                            return srDecrypt.ReadToEnd();  // 返回解密后的明文
                        }
                    }
                }
            }
        }
        static void Main(string[] args)
        {
            string originalText = "Hello, AES Encryption!";  // 原始明文
            Console.WriteLine("Original Text: " + originalText);  // 輸出原始文本
 
            string encryptedText = Encrypt(originalText);  // 加密
            Console.WriteLine("Encrypted Text: " + encryptedText);  // 輸出加密后的文本
 
            string decryptedText = Decrypt(encryptedText);  // 解密
            Console.WriteLine("Decrypted Text: " + decryptedText);  // 輸出解密后的文本
 
            Console.ReadKey();
        }
    }

Original Text: Hello, AES Encryption!
Encrypted Text: P5/fGFh/sUsYOGYOg7wDIA==
Decrypted Text: Hello, AES Encryption!