如果您只想使用内置的加密提供程序RijndaelManaged，请查看以下帮助文章（它也有一个简单的代码示例）：
http://msdn.microsoft.com/zh-CN/library/system.security.cryptography.rijndaelmanaged.aspx
以防万一您急需样品，这就是所有窃的荣耀：
using System;using System.IO;using System.Security.Cryptography;namespace RijndaelManaged_Example{ class RijndaelExample { public static void Main() { try { string original = "Here is some data to encrypt!"; // Create a new instance of the RijndaelManaged // class. This generates a new key and initialization // vector (IV). using (RijndaelManaged myRijndael = new RijndaelManaged()) { myRijndael.GenerateKey(); myRijndael.GenerateIV(); // Encrypt the string to an array of bytes. byte[] encrypted = EncryptStringToBytes(original, myRijndael.Key, myRijndael.IV); // Decrypt the bytes to a string. string roundtrip = DecryptStringFromBytes(encrypted, myRijndael.Key, myRijndael.IV); //Display the original data and the decrypted data. Console.WriteLine("Original: {0}", original); Console.WriteLine("Round Trip: {0}", roundtrip); } } catch (Exception e) { Console.WriteLine("Error: {0}", e.Message); } } static byte[] EncryptStringToBytes(string plainText, byte[] Key, byte[] IV) { // Check arguments. if (plainText == null || plainText.Length <= 0) throw new ArgumentNullException("plainText"); if (Key == null || Key.Length <= 0) throw new ArgumentNullException("Key"); if (IV == null || IV.Length <= 0) throw new ArgumentNullException("IV"); byte[] encrypted; // Create an RijndaelManaged object // with the specified key and IV. using (RijndaelManaged rijAlg = new RijndaelManaged()) { rijAlg.Key = Key; rijAlg.IV = IV; // Create a decryptor to perform the stream transform. ICryptoTransform encryptor = rijAlg.CreateEncryptor(rijAlg.Key, rijAlg.IV); // Create the streams used for encryption. 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(plainText); } encrypted = msEncrypt.ToArray(); } } } // Return the encrypted bytes from the memory stream. return encrypted; } static string DecryptStringFromBytes(byte[] cipherText, byte[] Key, byte[] IV) { // Check arguments. if (cipherText == null || cipherText.Length <= 0) throw new ArgumentNullException("cipherText"); if (Key == null || Key.Length <= 0) throw new ArgumentNullException("Key"); if (IV == null || IV.Length <= 0) throw new ArgumentNullException("IV"); // Declare the string used to hold // the decrypted text. string plaintext = null; // Create an RijndaelManaged object // with the specified key and IV. using (RijndaelManaged rijAlg = new RijndaelManaged()) { rijAlg.Key = Key; rijAlg.IV = IV; // Create a decrytor to perform the stream transform. ICryptoTransform decryptor = rijAlg.CreateDecryptor(rijAlg.Key, rijAlg.IV); // Create the streams used for decryption. using (MemoryStream msDecrypt = new MemoryStream(cipherText)) { using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read)) { using (StreamReader srDecrypt = new StreamReader(csDecrypt)) { // Read the decrypted bytes from the decrypting stream // and place them in a string. plaintext = srDecrypt.ReadToEnd(); } } } } return plaintext; } }}
