c# - 从泛型父类(super class)定义中获取正确的子类方法

Question

如何在多个子类中实现父类(super class)中定义的泛型方法？ 我需要由调用子类实例的类型决定正确的子类方法:

var someClassObj = new SubClass();
var = someClassObj.BuildList(v1, v2);

public abstract class SomeBase
{
    public List<T> BuildList<T>(int v1, int v2)
    {
        var results = new List<T>();

        for (int i = v1; i < v2; i++)
        {
            results.Add(AddItem<T>());
        }
        return results;
    }

    protected abstract T AddItem<T>();
}

public class SubClass : SomeBase
{


    protected override BusinessThing AddItem<T>()
    {
        var entity = new BusinessThing();
        entity.Name1 = "1";
        entity.Name2 = "2";
        entity.Name3 = "3";
        return entity;
    }
}

public class BusinessThing
{
    public string Name1 { get; set; }
    public string Name2 { get; set; }
    public string Name3 { get; set; }
}

上面没有构建:覆盖方法 'T SomeBase.AddItem()' 时无法更改返回类型

Answer 1

你可以让你的基类泛化而不是它的方法:

public abstract class SomeBase<T>
{
    public List<T> BuildList(int v1, int v2)
    {
        var results = new List<T>();

        for (int i = v1; i < v2; i++)
        {
            results.Add(AddItem());
        }
        return results;
    }

    protected abstract T AddItem();
}

public class SubClass : SomeBase<BusinessThing>
{
    protected override BusinessThing AddItem()
    {
        var entity = new BusinessThing();
        entity.Name1 = "1";
        entity.Name2 = "2";
        entity.Name3 = "3";
        return entity;
    }
}