在运行时执行隐式强制转换 [英] Execute implicit cast at runtime

问题描述

所以我有一个具有隐式强制转换的Generic类(主要是容器类)，如下所示:

So I have a Generic class (it's mostly a container class) with implicit casting, like this:

public class Container<T>  
{  
        public T Value { get; set; }

        public static implicit operator T(Container<T> t)
        {
            return t.Value;
        }

        public static implicit operator Container<T>(T t)
        {
            return new Container<T>() { Value = t };
        }
} 

因此，在运行时中，我想使用反射将 Container< int> 的实例转换为int，但似乎找不到方法，我尝试了几个地方，但我得到一个指定的强制转换无效.异常.

So in runtime I would like to cast an instance of Container<int> to int using reflection but cannot seem to find a way, I've tried the "Cast" method invoking mentioned in a couple of places but I'm getting an Specified cast is not valid. exception.

任何帮助将不胜感激.

推荐答案

除非有待讨论的类型是无法修改的程序集的内部类型，否则几乎没有很好的理由.

There's almost never a good reason to do this unless the type in question is internal to an assembly that you cannot modify.

但是，涉及到这一点，我个人更喜欢外观更简洁的 dynamic 解决方案(如jbtule所述)而不是反射.

But if it came to that, I would personally prefer the much cleaner-looking dynamic solution (as mentioned by jbtule) to reflection.

但是由于您要求使用反射解决方案(也许您使用的是.NET 3.5或更早的版本?)，所以可以这样做:

But since you asked for a solution with reflection (perhaps you are on .NET 3.5 or earlier?), you can do:

object obj = new Container<int>();

var type = obj.GetType();
var conversionMethod = type.GetMethod("op_Implicit", new[] { type });
int value = (int)conversionMethod.Invoke(null, new[] { obj });

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