检查对象是否实现了特定的通用接口 [英] Check if object implements specific generic interface
问题描述
我有多个类(为了解释而简化):
I have multiple classes (simplified for explaining purposes):
public class A : BaseClass,
IHandleEvent<Event1>,
IHandleEvent<Event2>
{
}
public class B : BaseClass,
IHandleEvent<Event3>,
IHandleEvent<Event4>
{
}
public class C : BaseClass,
IHandleEvent<Event2>,
IHandleEvent<Event3>
{
}
在我的BaseClass"中有一个方法,我想检查子类是否实现了特定事件的 IHandleEvent
.
In my "BaseClass" I have a method where I want to check whether or not the Child-class implements an IHandleEvent
of a specific event.
public void MyMethod()
{
...
var event = ...;
...
// If this class doesn't implement an IHandleEvent of the given event, return
...
}
来自这个 SO-answer 我知道如何检查对象是否实现了通用接口(实现了 IHandleEvent<>
),如下所示:
From this SO-answer I know how to check if an object implements a generic interface (implements IHandleEvent<>
), like this:
if (this.GetType().GetInterfaces().Any(x =>
x.IsGenericType && x.GenericTypeDefinition() == typeof(IHandleEvent<>)))
{
... // Some log-text
return;
}
但是,我不知道如何检查对象是否实现了特定的通用接口(实现了 IHandleEvent
).那么,如何在 if 中进行检查?
But, I don't know how to check if an object implements a SPECIFIC generic interface (implements IHandleEvent<Event1>
). So, how can this be checked in the if?
推荐答案
我们只需使用 is
或 as
运算符:
Simply us the is
or as
operator:
if( this is IHandleEvent<Event1> )
....
或者,如果类型参数在编译时未知:
Or, if the type argument isn't known at compile time:
var t = typeof( IHandleEvent<> ).MakeGenericType( /* any type here */ )
if( t.IsAssignableFrom( this.GetType() )
....
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