c# - 将 IOptions<> 注入(inject)静态类

Question

我想让类保持静态。是否有任何解决方法来注入(inject) IOptions<EncryptionSettings> 不修改访问修饰符？

public static class Encrypter
{
    private static readonly Encoding encoding = Encoding.UTF8;

    private static readonly EncryptionSettings _encryptionSettings;

    public static Encrypter(IOptions<EncryptionSettings> encryptionSettings)
    {
        _encryptionSettings = encryptionSettings.Value;
    }

    public static string Encrypt(string plainText)
    {
        (...)
    }

    public static string Decrypt(string plainText)
    {
        (...)
    }

    static byte[] HmacSHA256(String data)
    {
        (...)
    }
}

'Encrypter.Encrypter(IOptions)': access modifiers are not allowed on static constructors

'Encrypter.Encrypter(IOptions)': a static constructor must be parameterless

Answer 1

糟糕的设计选择使该类成为静态的。

并且您正在经历与尝试将其与依赖项注入(inject)一起使用相关的挑战。静电和 DI 不能很好地混合，应尽可能避免。

将所需的功能封装在抽象之后。

public interface IEncrypter {
    string Encrypt(string plainText);
    string Decrypt(string plainText);
}

并实现

public class Encrypter : IEncrypter {
    private static readonly Encoding encoding = Encoding.UTF8;
    private readonly EncryptionSettings _encryptionSettings;

    public Encrypter(IOptions<EncryptionSettings> encryptionSettings) {
        _encryptionSettings = encryptionSettings.Value;
    }

    public string Encrypt(string plainText) {
        //(...)
    }

    public string Decrypt(string plainText) {
        //(...)
    }

    static byte[] HmacSHA256(String data) {
        //(...)
    }
}

现在这将允许加密抽象 IEncrypter根据需要连同它自己的依赖项一起注入(inject)。即IOptions<TOption> .

如果打算成为唯一的加密服务，则在启动时将其注册为单例

services.AddSingleton<IEncrypter, Encrypter>();