Coalesce with property of nullable object?

Question

Hello is there any way formulate a condition like the one below ? If field is null then false else field.Property ?

class Node
{
    public bool IsFilled;
}

class Holder
{
    Node nodeBuffer;
    public bool IsFilled => this.nodeBuffer?.IsFilled ?? false; 
}

How can i say something like if nodeBuffer is null then false else nodeBuffer.IsFilled?

Answer 1

Yes, you can use the equality operator which works with Nullable<bool>

public bool IsFilled => this.nodeBuffer?.IsFilled == true;

Nullable types support all operators that their non-nullable type support, that's called: lifted operator

Answer 2

this.nodeBuffer?.IsFilled returns a Nullable<T> so you can just use GetValueOrDefault() method on it so it will be false if null.

So your property definition will look like below:

public bool IsFilled => (this.nodeBuffer?.IsFilled).GetValueOrDefault();