在C#中实现AES加密可以通过使用AesManaged类来实现。下面是一个简单的示例代码：
using System;using System.IO;using System.Security.Cryptography;using System.Text;public class AesEncryption{ public static string Encrypt(string plainText, string key, string iv) { byte[] keyBytes = Encoding.UTF8.GetBytes(key); byte[] ivBytes = Encoding.UTF8.GetBytes(iv); byte[] encryptedBytes; using (AesManaged aes = new AesManaged()) { aes.Key = keyBytes; aes.IV = ivBytes; ICryptoTransform encryptor = aes.CreateEncryptor(aes.Key, aes.IV); using (MemoryStream ms = new MemoryStream()) { using (CryptoStream cs = new CryptoStream(ms, encryptor, CryptoStreamMode.Write)) { using (StreamWriter sw = new StreamWriter(cs)) { sw.Write(plainText); } encryptedBytes = ms.ToArray(); } } } return Convert.ToBase64String(encryptedBytes); } public static string Decrypt(string encryptedText, string key, string iv) { byte[] keyBytes = Encoding.UTF8.GetBytes(key); byte[] ivBytes = Encoding.UTF8.GetBytes(iv); byte[] encryptedBytes = Convert.FromBase64String(encryptedText); string decryptedText; using (AesManaged aes = new AesManaged()) { aes.Key = keyBytes; aes.IV = ivBytes; ICryptoTransform decryptor = aes.CreateDecryptor(aes.Key, aes.IV); using (MemoryStream ms = new MemoryStream(encryptedBytes)) { using (CryptoStream cs = new CryptoStream(ms, decryptor, CryptoStreamMode.Read)) { using (StreamReader sr = new StreamReader(cs)) { decryptedText = sr.ReadToEnd(); } } } } return decryptedText; }}使用以上代码，你可以通过调用AesEncryption.Encrypt方法进行加密，调用AesEncryption.Decrypt方法进行解密。请注意，你需要提供一个密钥（key）和一个初始化向量（iv），这两个值必须是相同的才能正确解密。
