如何找到实现给定接口的所有类? [英] How to find all the classes which implement a given interface?

问题描述

在给定的命名空间下，我有一组实现接口的类.我们称之为ISomething.我有另一个类(我们称之为 CClass)，它知道 ISomething 但不知道实现该接口的类.

Under a given namespace, I have a set of classes which implement an interface. Let's call it ISomething. I have another class (let's call it CClass) which knows about ISomething but doesn't know about the classes which implement that interface.

我希望 CClass 查找 ISomething 的所有实现，实例化它的一个实例并执行该方法.

I would like that CClass to look for all the implementation of ISomething, instantiate an instance of it and execute the method.

有人知道如何使用 C# 3.5 做到这一点吗?

Does anybody have an idea on how to do that with C# 3.5?

推荐答案

工作代码示例:

var instances = from t in Assembly.GetExecutingAssembly().GetTypes()
                where t.GetInterfaces().Contains(typeof(ISomething))
                         && t.GetConstructor(Type.EmptyTypes) != null
                select Activator.CreateInstance(t) as ISomething;

foreach (var instance in instances)
{
    instance.Foo(); // where Foo is a method of ISomething
}

编辑添加了对无参数构造函数的检查，以便对 CreateInstance 的调用成功.

Edit Added a check for a parameterless constructor so that the call to CreateInstance will succeed.

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