[英]How do I find out whether an object's type is a subclass of IEnumerable<T> for any value type T?
I need to validate an object to see whether it is null, a value type, or IEnumerable<T>
where T
is a value type. 我需要验证一个对象,看它是否为null,值类型或
IEnumerable<T>
,其中T
是值类型。 So far I have: 到目前为止,我有:
if ((obj == null) ||
(obj .GetType().IsValueType))
{
valid = true;
}
else if (obj.GetType().IsSubclassOf(typeof(IEnumerable<>)))
{
// TODO: check whether the generic parameter is a value type.
}
So I've found that the object is null, a value type, or IEnumerable<T>
for some T
; 所以我发现对象为null,值类型或某些
T
IEnumerable<T>
; how do I check whether that T
is a value type? 如何检查
T
是否为值类型?
(edit - added value type bits) (编辑 - 添加值类型位)
You need to check all the interfaces it implements (note it could in theory implement IEnumerable<T>
for multiple T
): 你需要检查它实现的所有接口(注意它理论上可以为多个
T
实现IEnumerable<T>
):
foreach (Type interfaceType in obj.GetType().GetInterfaces())
{
if (interfaceType.IsGenericType
&& interfaceType.GetGenericTypeDefinition() == typeof(IEnumerable<>))
{
Type itemType = interfaceType.GetGenericArguments()[0];
if(!itemType.IsValueType) continue;
Console.WriteLine("IEnumerable-of-" + itemType.FullName);
}
}
My generic contribution that checks if a given type (or its base classes) implements an interface of type T: 我的通用贡献,检查给定类型(或其基类)是否实现了类型为T的接口:
public static bool ImplementsInterface(this Type type, Type interfaceType)
{
while (type != null && type != typeof(object))
{
if (type.GetInterfaces().Any(@interface =>
@interface.IsGenericType
&& @interface.GetGenericTypeDefinition() == interfaceType))
{
return true;
}
type = type.BaseType;
}
return false;
}
你能用GetGenericArguments
做些什么吗?
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