typeof check for nullability

[Andrew Robinson]

I am guessing there is a simple solution but given a type T, how can I check
for nullability?

how can I accomplish the following?

bool nullable = typeof(int).IsNullable; // false
bool nullable = typeof(int?).IsNullable; // true
bool nullable = typeof(string).IsNullable; // true

Thanks for any help.

--

Andrew Robinson

[Jon Skeet [C# MVP]]

Andrew Robinson <ne****@nospam.nospamwrote:

I am guessing there is a simple solution but given a type T, how can I check
for nullability?

how can I accomplish the following?

bool nullable = typeof(int).IsNullable; // false
bool nullable = typeof(int?).IsNullable; // true
bool nullable = typeof(string).IsNullable; // true

using System;

class Test
{
static void Main()
{
Console.WriteLine (IsNullable(typeof(int)));
Console.WriteLine (IsNullable(typeof(int?)));
Console.WriteLine (IsNullable(typeof(string)));
}

static bool IsNullable (Type t)
{
return !t.IsValueType ||
(t.IsGenericType &&
t.GetGenericTypeDefinition()==typeof(Nullable<>));
}
}

--
Jon Skeet - <sk***@pobox.com>
http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
If replying to the group, please do not mail me too

[Andrew Robinson]

Thanks,

--

Andrew Robinson
"Jon Skeet [C# MVP]" <sk***@pobox.comwrote in message
news:MP************************@msnews.microsoft.c om...

Andrew Robinson <ne****@nospam.nospamwrote:

>I am guessing there is a simple solution but given a type T, how can I
check
for nullability?

how can I accomplish the following?

bool nullable = typeof(int).IsNullable; // false
bool nullable = typeof(int?).IsNullable; // true
bool nullable = typeof(string).IsNullable; // true

using System;

class Test
{
static void Main()
{
Console.WriteLine (IsNullable(typeof(int)));
Console.WriteLine (IsNullable(typeof(int?)));
Console.WriteLine (IsNullable(typeof(string)));
}

static bool IsNullable (Type t)
{
return !t.IsValueType ||
(t.IsGenericType &&
t.GetGenericTypeDefinition()==typeof(Nullable<>));
}
}

--
Jon Skeet - <sk***@pobox.com>
http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
If replying to the group, please do not mail me too