请给出完整的c#代码

当然，我可以给你展示一个简单的C#代码片段，用于在SQLite数据库中设置加密。这里我们假设你已经设置了`System.Data.SQLite` NuGet包，并且已经有了一个数据库连接实例`conn`。我们将使用`System.Security.Cryptography`中的`Aes`加密进行演示：

using System;
using System.IO;
using System.Security.Cryptography;
using SQLite;

class Program
{
    static void Main(string[] args)
    {
        string password = "your_database_password"; // 设置你的加密密码
        byte[] salt = GenerateSalt();

        // 使用密码生成盐并加密数据
        string sensitiveDataToStore = "Sensitive data to encrypt";
        byte[] encryptedData = EncryptData(sensitiveDataToStore, password, salt);

        // 执行SQL语句启用数据库加密
        using (var conn = new SQLiteConnection("Data Source=mydatabase.db;Pragma=encryption_key='" + Convert.ToBase64String(salt) + "'"))
        {
            conn.Open();
            conn.ExecuteNonQuery($"PRAGMA key = '{password}';");
            
            // 插入加密后的数据
            var command = conn.CreateCommand();
            command.CommandText = "INSERT INTO MyTable (EncryptedData) VALUES (@data)";
            command.Parameters.AddWithValue("@data", Convert.ToBase64String(encryptedData));
            command.ExecuteNonQuery();
        }

        Console.WriteLine("Data has been encrypted and stored.");
    }

    // 生成随机盐值
    private static byte[] GenerateSalt()
    {
        using (var rng = RandomNumberGenerator.Create())
        {
            return rng.GetBytes(16); // 使用16字节作为默认盐值长度
        }
    }

    // 加密数据
    private static byte[] EncryptData(string data, string password, byte[] salt)
    {
        using (Aes aes = Aes.Create())
        {
            aes.KeySize = 256;
            aes.BlockSize = 128;
            var key = DeriveKeyAndIV(password, salt, aes.KeySize / 8);
            aes.Key = key.Key;
            aes.IV = key.IV;

            using (var encryptor = aes.CreateEncryptor(aes.Key, aes.IV))
            {
                using (var msEncrypt = new MemoryStream())
                {
                    using (var csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
                    {
                        using (var swEncrypt = new StreamWriter(csEncrypt))
                        {
                            swEncrypt.Write(data);
                        }
                        return msEncrypt.ToArray();
                    }
                }
            }
        }
    }

    // 使用PBKDF2DeriveBytes函数生成密钥和初始化向量
    private static Rfc2898DeriveBytes DeriveKeyAndIV(string password, byte[] salt, int iterations)
    {
        Rfc2898DeriveBytes deriveBytes = new Rfc2898DeriveBytes(password, salt, iterations);
        return deriveBytes;
    }
}

这段代码展示了如何开启数据库加密、生成盐值、加密数据以及将其存储到数据库中。注意实际应用中，你需要处理异常，以及在登录验证时解密数据。