问题
This question is an opposite of How to find types that are direct descendants of a base class?
If this is the inheritance hierarchy I have,
class Base
{
}
class Derived1 : Base
{
}
class Derived1A : Derived1
{
}
class Derived1B : Derived1
{
}
class Derived2 : Base
{
}
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))
should give me
-> { Derived1A, Derived1B, Derived2 }
回答1:
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));
}
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);
}
来源：https://stackoverflow.com/questions/18487904/get-all-last-descendants-of-a-base-type