Custom class/type following the "Nullable pattern"

[prog123]

Hi!

If I have a Nullable type variable, I can set its initial value using a quotation mark like this:

aNullableVariableOfInteger = 4

In the background an instance of the type Nullable(Of Integer) is created and its property named "value" is set to 4.

How can I create such a class/type? Can you please show me a pattern?

[nukefusion]

Presumably you mean that you can set up the nullable variable using a question mark? Like this?

Dim myNullableInt As Integer?

Nullable types in this sense only apply to value types. A reference type, as an object, would have the ability to be null anyway, so all classes you create will be nullable. You can however apply this to variable of a custom structure. You'd declare them in the same way, post-fixed with a question mark.

You can find some more reading here:

Nullable Class
Nullable(T) Structure