未显示用于显示解密数据的消息框

Question

我已经使用这个网站实现了 AES 算法。 https://msdn.microsoft.com/en-us/library/system.security.cryptography.aesmanaged(v=vs.110).aspx

加密后将值转换为字符串并发送到数据库。这是成功的。当我检索值加密值时，那是成功的。但是当我开始解密时，没有发现错误，也没有显示输出（使用消息框获取输出）。我应该怎么办？

byte[] cipherbytes = System.Text.ASCIIEncoding.Default.GetBytes(encypted);
       //AES Decryption start
        try
        {
            using (AesManaged myAes = new AesManaged())
            {
                // Decrypt the bytes to a string.
                string roundtrip = DecryptStringFromBytes_Aes(cipherbytes, myAes.Key, myAes.IV);
                //Console.WriteLine("Round Trip: {0}", roundtrip);
                MessageBox.Show(roundtrip, "Decrypted text"); //this meessage box is not showing
            }

        }
        catch (Exception e)
        {
            Console.WriteLine("Error: {0}", e.Message);
            //MessageBox.Show("Inside is working");
        }

//这里也是解密算法

static string DecryptStringFromBytes_Aes(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 AesManaged object
        // with the specified key and IV.
        using (AesManaged aesAlg = new AesManaged())
        {
            aesAlg.Key = Key;
            aesAlg.IV = IV;

            // Create a decrytor to perform the stream transform.
            ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.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();
                    }
                }
            }

        }

Answer 1

您的 DecryptStringFromBytes_Aes 不是 return 值，您应该在末尾添加 return plaintext;。它可以编译吗？

MessageBox 未显示，因为...它没有到达该行，您在代码的前面（在 DecryptStringFromBytes_Aes 函数中）遇到异常。在Console.WriteLine("Error: {0}", e.Message);这一行打断点，查看错误。您也可以在控制台检查写入的错误。

未显示用于显示解密数据的消息框

Message box is not showing for displaying Decryption Data

c#

aescryptoserviceprovider