我怎样才能看到GenericTypeDefinition是否实现IEnumerable<> [英] How can I see if GenericTypeDefinition implements IEnumerable<>

问题描述

我有一个方法来检查一个类型是否为泛型，然后检查GenericTypeDefinition是否为 IEnumerable<> 。

I have a method that checks if a type is generic and then checks if the GenericTypeDefinition is of IEnumerable<>.

static Type GetEnumerableType(Type type)  
{  
    if(type.IsGenericType) {  
        var genericTypeDefinition = type.GetGenericTypeDefinition();  
        if (genericTypeDefinition == typeof(IEnumerable<>)) {  
            return type.GetGenericArguments()[0];  
        }  
    }  
    return null;  
}

如果它是IEnumerable，它就像一个魅力一样。如果GenericTypeDefinition是 IList> 或 List>< / code>它不起作用。我试过..

Works like a charm if it is an IEnumerable. If the the GenericTypeDefinition is IList<> or List<> it doesn't work. I've tried..

typeof(IEnumerable<>).IsAssignableFrom(genericTypeDefinition)

..没有成功。当然，必须有更好的方法，然后链接else语句

..without success. Of course there must be a better way then chaining else-statements?

推荐答案

您可以使用 GetInterfaces 来检查类型是否实现 IEnumerable<> 像这样

You can use GetInterfaces to check if a type implements IEnumerable<> like so

Type type = new List<string>().GetType();

if (type.IsGenericType) 
{
    var genericTypeDefinition = type.GetGenericTypeDefinition();

    if (genericTypeDefinition.GetInterfaces()
                .Any( t => t.IsGenericType && 
                           t.GetGenericTypeDefinition() == typeof(IEnumerable<>)))
    {
        return type.GetGenericArguments()[0];
    }
}

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