C# C使用select查询中的函数对表数据进行解密

我尝试使用函数Decrypt将数据表单dtls表显示给datagridview-Decrypted 代码在没有函数的情况下运行良好。不确定如何在select查询中实现该函数

try
{
    con = new MySqlConnection();
    con.ConnectionString = constring;
    con.Open();

    MySqlDataAdapter myDA = new MySqlDataAdapter();

    string cmd = "SELECT Decrypt(username) FROM sys.dtls ";

    myDA.SelectCommand = new MySqlCommand(cmd, con);

    DataTable table = new DataTable();
    myDA.Fill(table);
    BindingSource bSource = new BindingSource();
    bSource.DataSource = table;

    dgvShow.DataSource = bSource;

    {

    }
    con.Close();

    }

catch (MySql.Data.MySqlClient.MySqlException ex)
{
    MessageBox.Show(ex.Message);
}

}



public string Decrypt(string cipherText)
{
    string EncryptionKey = "MAKV2SPBNI99212";
    byte[] cipherBytes = Convert.FromBase64String(cipherText);
    using (Aes encryptor = Aes.Create())
    {
        Rfc2898DeriveBytes pdb = new Rfc2898DeriveBytes(EncryptionKey, new byte[] { 0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d, 0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76 });
        encryptor.Key = pdb.GetBytes(32);
        encryptor.IV = pdb.GetBytes(16);
        using (MemoryStream ms = new MemoryStream())
        {
            using (CryptoStream cs = new CryptoStream(ms, encryptor.CreateDecryptor(), CryptoStreamMode.Write))
            {
                cs.Write(cipherBytes, 0, cipherBytes.Length);
                cs.Close();
            }
            cipherText = Encoding.Unicode.GetString(ms.ToArray());
        }
    }
    return cipherText;


}

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SQL不知道您的解密函数。您需要做的是运行查询来选择用户名：从sys.dtls中选择username，然后迭代结果并解密用户名，然后：

myDA.Fill(table);
foreach(DataRow row in table.Rows)
{
    row["username"] = Decrypt(row["username"].ToString());
}

---

现在谢谢，没有错误，但是Datagridview保持为空-有什么想法吗？我不确定。你试过调试它吗？循环结束后，在该行上放置一个断点，以查看数据是否如您所期望的那样存在，然后继续查看发生了什么。