c# - 在 C# 中调用 super 构造函数

Question

我有一些类，如 AccountsController、ProductsController 等，它们都继承自 BaseController。 Unity 根据需要设置我的服务。这些类也都需要 _sequence 服务。因为这是所有类的共同要求，所以我想在 BaseController 中对此进行编码。

public class AccountsController : BaseController
{
    public AccountsController(
        IService<Account> accountService) {
        _account = accountService;
    }

public class ProductsController : BaseController
{
    public ProductsController(
        IService<Account> productService) {
        _product = productService;
    }


public class BaseController : Controller
{
    public IService<Account> _account;
    public IService<Product> _product;
    protected ISequenceService _sequence;

    public BaseController(
        ISequenceService sequenceService) {
        _sequence = sequenceService;
    }

但是我该怎么做呢？我是否应该在每个 AccountsController 和 ProductsController 的构造函数中设置对 BaseController 的调用？

Answer 1

你可以链constructors :

public class ProductsController : BaseController
{
    public ProductsController(
        IService<Account> productService) : base(productService)
    {
        _product = productService;
    }
}

请注意，链接的 BaseController(使用 base 关键字)已传递给 productService 参数，但这可以是任何内容。

更新:

您可以执行以下操作(穷人的依赖注入(inject)):

public class ProductsController : BaseController
{
    public ProductsController(
        IService<Account> productService) : base(new SequenceService())
    {
        _product = productService;
    }
}

或者，通过您的继承类型传递对ISequenceService 的依赖:

public class ProductsController : BaseController
{
    public ProductsController(
        IService<Account> productService, ISequenceService sequenceService) 
        : base(sequenceService)
    {
        _product = productService;
    }
}