C#•2y ago

Warning: NULL literal or a possible NULL value is being converted to a non-nullable type.

Ladies and gentlemen,

I am confronted with a new type of warning, that I would like to understand.

What should I do?

This is the code:

    [HttpGet("/{userSlug}")]
    public async Task<User> ShowUser(string userSlug)
    {
        User user = await _dataContext.Users.FirstOrDefaultAsync((u) => u.Slug == userSlug);

        return user;
    }

    [HttpGet("/{userSlug}")]
    public async Task<User> ShowUser(string userSlug)
    {
        User user = await _dataContext.Users.FirstOrDefaultAsync((u) => u.Slug == userSlug);

        return user;
    }

This is the message:

NULL literal or a possible NULL value is being converted to a non-nullable type

Timo MartinsonOP•3/1/24, 5:43 PM

what should I do ??

Pobiega•3/1/24, 5:44 PM

will return the first item matching the predicate, or

default

default

if nothing matches

Pobiega•3/1/24, 5:44 PM

default for a reference type is null

Pobiega•3/1/24, 5:44 PM

that means you are assingning

null

null

to , which is declared as non-nullable

Pobiega•3/1/24, 5:45 PM

you must either change this to use so it never returns null, or change the return value to if its intended that null is an acceptable return value

Timo MartinsonOP•3/1/24, 5:45 PM

Thank you.

Timo MartinsonOP•3/1/24, 5:45 PM

again!