如何判断一个实例是某种类型或任何派生类型 [英] How to tell if an instance is of a certain Type or any derived types

问题描述

我试图写一个验证，以确认一个对象实例可以被转换为变量类型。我有一个目标，他们需要提供类型的Type实例。但类型可能会有所不同。这基本上是我想做的事情。

I'm trying to write a validation to check that an Object instance can be cast to a variable Type. I have a Type instance for the type of object they need to provide. But the Type can vary. This is basically what I want to do.

        Object obj = new object();
        Type typ = typeof(string); //just a sample, really typ is a variable

        if(obj is typ) //this is wrong "is" does not work like this
        {
            //do something
        }

类型的对象本身所具有的IsSubClassOf和IsInstanceOfType方法。但我真正想检查是，如果 OBJ 是实例的典型或任何从典型派生类。

The type object itself has the IsSubClassOf, and IsInstanceOfType methods. But what I really want to check is if obj is either an instance of typ or any class derived from typ.

似乎是一个简单的问题，但我似乎无法推测出来。

Seems like a simple question, but I can't seem to figure it out.

推荐答案

这个怎么样：

    MyObject myObject = new MyObject();
    Type type = myObject.GetType();

    if(typeof(YourBaseObject).IsAssignableFrom(type))
    {  
       //Do your casting.
       YourBaseObject baseobject = (YourBaseObject)myObject;
    }  

这会告诉你，如果该对象可以是铸造于特定类型。

This tells you if that object can be casted to that certain type.

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