检查对象是否为C#中的非特定泛型类型 [英] Check if object is of non-specific generic type in C#

问题描述

说我有以下课程:

public class General<T> { }

我想找出一个对象是否属于该类型. 我知道我可以使用反射来确定对象是否具有Type.GetGenericTypeDefinition的通用类型，但是我想避免这种情况.

And I want to find out if an object is of that type. I know I can use reflection to find out whether the object is of that generic type with Type.GetGenericTypeDefinition, but I want to avoid that.

是否可以做类似obj is General<T>或obj.GetType().IsAssignableFrom(typeof(General<T>))的事情?

Is it possible to do something like obj is General<T>, or obj.GetType().IsAssignableFrom(typeof(General<T>))?

尽管我可能在搜索中使用了错误的关键字，但我找不到类似的问题，这让我感到很惊讶.

I'm quite surprised that I couldn't find a similar question, although I may have used wrong keywords in my searches.

推荐答案

您可以执行以下操作:

var obj = new General<int>();
var type = obj.GetType();
var isGeneral = 
(type.IsGenericType && type.GetGenericTypeDefinition() == typeof(General<>)) ||
type.GetBaseTypes().Any(x => x.IsGenericType && 
                             x.GetGenericTypeDefinition() == typeof(General<>));

GetBaseTypes是以下扩展方法:

public static IEnumerable<Type> GetBaseTypes(this Type type)
{
    if (type.BaseType == null) return type.GetInterfaces();

    return new []{type}.Concat(
           Enumerable.Repeat(type.BaseType, 1)
                     .Concat(type.GetInterfaces())
                     .Concat(type.GetInterfaces().SelectMany<Type, Type>(GetBaseTypes))
                     .Concat(type.BaseType.GetBaseTypes()));
}

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