Why that code doesn't setting null to value

Question

I can not understood why this code doesn't changing value from null(compiler even can't see that null instead of that Im reciving blank spots)

 public string? ClubName
        {
            get => _clubname;

            set
            {
                _clubname = value ?? "it";
            }
        }

Can you show how you are using that property? Show the value of the property before an assignment to it, show how you make the assignment. Then show us the value of the property after the assignment. Basically, let us step through your code — Flydog57
– Flydog57, Commented Oct 22, 2022 at 17:59
At no point is the setter for ClubName called in the code you posted, therefore it will have it's default value of null. If you write Console.WriteLine(null) it won't crash - it will just be the same as Console.WriteLine("") — Matthew Watson
– Matthew Watson, Commented Oct 22, 2022 at 18:06
Because property setters are not called when you construct an object, but only when actually set the property. — Poul Bak
– Poul Bak, Commented Oct 22, 2022 at 18:06

Eric J. · Accepted Answer · 2022-10-22 18:09:21Z

2

Your setter uses the null-coalescing operator ??, which substitutes "it" should value be null:

_clubname = value ?? "it";

So, you can never assign null to the property via the setter.

However, your property is backed by this private field:

_string clubname;

which the compiler initializes to null.

While you can never set null, the code in your screenshot never assigns a value, so the initial value remains.

edited Oct 22, 2022 at 18:09

answered Oct 22, 2022 at 17:59

Eric J.

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5 Comments

Poul Bak Over a year ago

I think you misunderstand the question: " why this code doesn't changing value from null" - note FROM null.

Eric J. Over a year ago

Ah. Because you never set a value, and _clubname is initialized to null by default.

Eric J. Over a year ago

Updated my answer accordingly.

Konrad Over a year ago

that make a sense, thanks so much! I overlooked that

Flydog57 Over a year ago

@PoulBak: note that the question has been edited three times, taking it from nearly incomprehensible (the version this answer attempts to respond to) to merely confusing. I would not have guessed what the question was from the first version

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