How to convert from int to int?, in C#?

Question

I have a int i want to save as a int? Is it possible and if so how?

Answer 1

There's an implicit conversion:

int nonNullable = 5;
int? nullable = nonNullable;

(This is given in section 6.1.4 of the C# specification.)

The reverse operation is unsafe, of course, because the nullable value could be null. There's an explicit conversion, or you can use the Value property:

int? nullable = new int?(5); // Just to be clear :)

// These are equivalent
int nonNullable1 = (int) nullable;
int nonNullable2 = nullable.Value;

Answer 2

This goes automatic. Lets say you have the following int

int myInt = 5;

Then you can write the following without problems:

int? myNullableInt = myInt;