如何确定类型是否为 Action/Func 委托之一? [英] How to determine if the type is one of the Action/Func delegates?

问题描述

除此之外，还有更好的方法来确定类型是否是 Action<> 委托之一.

Other than doing this is there a better way to determine whether type is a one of the Action<> delegates.

if(obj is MulticastDelegate && obj.GetType().FullName.StartsWith("System.Action"))
{
   ...
}

推荐答案

这看起来非常简单.

static bool IsAction(Type type)
{
    if (type == typeof(System.Action)) return true;
    Type generic = null;
    if (type.IsGenericTypeDefinition) generic = type;
    else if (type.IsGenericType) generic = type.GetGenericTypeDefinition();
    if (generic == null) return false;
    if (generic == typeof(System.Action<>)) return true;
    if (generic == typeof(System.Action<,>)) return true;
    ... and so on ...
    return false;
}

我很好奇你为什么想知道这个.如果特定类型恰好是 Action 的一个版本，您会关心什么?你打算怎么处理这些信息?

I'm curious as to why you want to know this though. What do you care if a particular type happens to be one of the versions of Action? What are you going to do with that information?

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