CODEWITHSUNDEEP
c#reflection
andleer
andleer

Reputation: 22578

C# Reflected Property Type

I am using reflection to get the values out of an anonymous type:

object value = property.GetValue(item, null);

when the underlying value is a nullable type (T?), how can I get the underlying type when the value is null?

Given

int? i = null;

type = FunctionX(i);
type == typeof(int); // true

Looking for FunctionX(). Hope this makes sense. Thanks.

Upvotes: 3

Views: 3884

Answers (3)

BFree
BFree

Reputation: 103770

You can do something like this:

if(type.IsgenericType)
{
   Type genericType = type.GetGenericArguments()[0];
}

EDIT: For general purpose use:

public Type GetTypeOrUnderlyingType(object o)
{
   Type type = o.GetType();
   if(!type.IsGenericType){return type;}
   return type.GetGenericArguments()[0];
}

usage:

int? i = null;

type = GetTypeOrUnderlyingType(i);
type == typeof(int); //true

This will work for any generic type, not just Nullable.

Upvotes: 6

Samuel
Samuel

Reputation: 38366

If you know that is Nullable<T>, you can use the static helper GetUnderlyingType(Type) in Nullable.

int? i = null;

type = Nullable.GetUnderlyingType(i.GetType());
type == typeof(int); // true

Upvotes: 2

StevenMcD
StevenMcD

Reputation: 17502

from what I understand on http://blogs.msdn.com/haibo_luo/archive/2005/08/23/455241.aspx you will just get a Nullable version of the type returned.

Upvotes: 0

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