如何在 C# 中编写具有多个参数的扩展方法？

Question

我写了这个扩展方法，但我只有一个参数。

我的 C# 代码：

public static string ToEncrypt(this string key, string passWord)
{
    // Salt and IV is randomly generated each time, but is prepended to encrypted cipher text
    // so that the same Salt and IV values can be used when decrypting.  
    var saltStringBytes = Generate256BitsOfRandomEntropy();
    var ivStringBytes = Generate256BitsOfRandomEntropy();
    var plainTextBytes = Encoding.UTF8.GetBytes(key);

    using (var password = new Rfc2898DeriveBytes(passWord, saltStringBytes, DerivationIterations))
    {
        var keyBytes = password.GetBytes(Keysize / 8);

        using (var symmetricKey = new RijndaelManaged())
        {
            symmetricKey.BlockSize = 256;
            symmetricKey.Mode = CipherMode.CBC;
            symmetricKey.Padding = PaddingMode.PKCS7;

            using (var encryptor = symmetricKey.CreateEncryptor(keyBytes, ivStringBytes))
            {
                using (var memoryStream = new MemoryStream())
                {
                    using (var cryptoStream = new CryptoStream(memoryStream, encryptor, CryptoStreamMode.Write))
                    {
                        cryptoStream.Write(plainTextBytes, 0, plainTextBytes.Length);
                        cryptoStream.FlushFinalBlock();
                        // Create the final bytes as a concatenation of the random salt bytes, the random iv bytes and the cipher bytes.
                        var cipherTextBytes = saltStringBytes;
                        cipherTextBytes = cipherTextBytes.Concat(ivStringBytes).ToArray();
                        cipherTextBytes = cipherTextBytes.Concat(memoryStream.ToArray()).ToArray();
                        memoryStream.Close();
                        cryptoStream.Close();

                        return Convert.ToBase64String(cipherTextBytes);
                    }
                }
            }
        }
    }
}

我尝试使用这种扩展方法：

回调未命中参数

我在谷歌搜索过，但找不到解决我的问题的方法。

谢谢大家！对不起，我的英语不好

Answer 1

我认为您正在尝试编写一个扩展方法来使用密钥加密密码。所以你的函数头应该是：

public static string ToEncrypt(this string passWord, string key)

稍后您可以使用此扩展程序，如下所示：

string encrpted = password.ToEncrypt("your key here");