如何找到它实现指定接口的所有类？ [英] How to find all the classes which implement a given interface?

问题描述

在一个给定的空间，我有一组用于实现接口的类。让我们把它叫做 ISomething 。我有另一个类（姑且称之为 CClass ），它知道 ISomething ，但不知道它们实现的类该接口。

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.

我想这 CClass 寻找 ISomething 的全部实现，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.

没有任何人有关于如何做一个想法，用C＃3.5？

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

推荐答案

一个工作code-示例：

A working code-sample:

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
}

修改增加了参数的构造函数的检查，以便调用的CreateInstance会成功的。

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

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