c# 从泛型类继承

Question

让我描述一下逻辑，然后是类结构。有对象，所有对象都必须继承自 ConfigurationObjectBase。每个对象都必须归 Manager 所有，并且所有 Manager 都必须从 ConfigurationObjectManagerBase 派生。当创建一个新的对象实例时，其中一个构造函数必须接受 Manager 的实例，并且该 Manager 的实例必须将该对象实例添加到其名为 ChildObjects 的属性中。以下是班级样本。您能否根据上述业务规则帮助纠正以下代码？谢谢。

public class ConfigurationObjectBase<ObjectType>
{
    public ConfigurationObjectBase(ConfigurationObjectManagerBase<ObjectType> ownerManager)
    {
        ownerManager.ChildObjects.Add(this);
    }
}


public class ConfigurationObjectManagerBase<ObjectType>
{
    public ConfigurationObjectManagerBase()
    {
        ChildObjects = new List<ObjectType>();
    }

    public List<ObjectType> ChildObjects { get; set; }
}

public class Catalog : ConfigurationObjectBase<Catalog>
{
    public Catalog(CatalogManager ownerManager) : base(???)
    {

    }
}

public class CatalogManager : ConfigurationObjectManagerBase<CatalogManager>
{
    public CatalogManager() : base()
    {
    }
}

Answer 1

您的代码中有两个问题：

• CatalogManager 应该继承自 ConfigurationObjectManagerBase<Catalog>，而不是 ConfigurationObjectManagerBase<CatalogManager>
• ChildObjects 应该是ConfigurationObjectBase<ObjectType> 的列表，而不是ObjectType 的列表（否则你不能添加ConfigurationObjectBase<ObjectType> 到它）

所以代码应该是这样的：

public class ConfigurationObjectBase<ObjectType>
{
    public ConfigurationObjectBase(ConfigurationObjectManagerBase<ObjectType> ownerManager)
    {
        ownerManager.ChildObjects.Add(this);
    }
}


public class ConfigurationObjectManagerBase<ObjectType>
{
    public ConfigurationObjectManagerBase()
    {
        ChildObjects = new List<ConfigurationObjectBase<ObjectType>>();
    }

    public List<ConfigurationObjectBase<ObjectType>> ChildObjects { get; set; }
}

public class Catalog : ConfigurationObjectBase<Catalog>
{
    public Catalog(CatalogManager ownerManager) : base(ownerManager)
    {

    }
}

public class CatalogManager : ConfigurationObjectManagerBase<Catalog>
{
    public CatalogManager()
    {
    }
}

另外，您不需要调用默认的基类构造函数 (base())，它由编译器隐式完成。