获取基本类型的所有后代? [英] Get all last descendants of a base type?

问题描述

此问题与如何查找属于基类的直接后代的类型?

如果这是我拥有的继承层次结构，

If this is the inheritance hierarchy I have,

class Base
{

}



class Derived1 : Base
{

}

class Derived1A : Derived1
{

}

class Derived1B : Derived1
{

}



class Derived2 : Base
{

}

我需要一种机制来查找特定程序集中位于继承树末尾的所有Base类的子类型.换句话说，

I need a mechanism to find all the sub types of Base class in a particular assembly which are at the end of the inheritance tree. In other words,

SubTypesOf(typeof(Base)) 

应该给我

-> { Derived1A, Derived1B, Derived2 }

推荐答案

这就是我提出的.不知道是否存在一些更优雅/有效的解决方案.

This is what I have come up with. Not sure if some more elegant/efficient solutions exist..

public static IEnumerable<Type> GetLastDescendants(this Type t)
{
    if (!t.IsClass)
        throw new Exception(t + " is not a class");

    var subTypes = t.Assembly.GetTypes().Where(x => x.IsSubclassOf(t)).ToArray();
    return subTypes.Where(x => subTypes.All(y => y.BaseType != x));
}

出于完整性考虑，我会在此处

And for sake of completeness, I will repost the answer for direct descendants given here

public static IEnumerable<Type> GetDirectDescendants(this Type t)
{
    if (!t.IsClass)
        throw new Exception(t + " is not a class");

    return t.Assembly.GetTypes().Where(x => x.BaseType == t);
}

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