How to Type Cast null as Bool in C#?

Question

I'm having one null-able bool (bool?) variable, it holds a value null. One more variable of type pure bool, I tried to convert the null-able bool to bool. But I faced an error "Nullable object must have a value."

My C# Code is

bool? x = (bool?) null;
bool y = (bool)x;

Crosier

Your value is null...it has no bool value to be cast to - if you'd like the default value for the type to be assigned if x is null, use the GetValueOrDefault() method. – Almanza

Answer 1

Use x.GetValueOrDefault() to assign default value (false for System.Boolean) to y in the event that x.HasValue == false.

Alternatively you can use the null-coalescing operator (??), like so:

bool y = x ?? false;

Gothart

I'd use the alternative one primarily .. :) – Jeffersonjeffery

Answer 2

Checking for equality with a boolean constant is a convenient shortcut:

        var x = (bool?) null;
        var y = x == true;

Marmion

Answer 3

If I have a property boolean

If (HasData.HasValue) Then
            Dim value As Boolean = HasData.Value
        End If
        ' or you can also do this
        If (HasData IsNot Nothing) Then

    End If

That should fix your bug.

hope this helps

Suellen