C#•5mo 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

3 Replies

Timo Martinson•5mo ago

what should I do ?? 😦

Pobiega•5mo ago

FirstOrDefaultAsync will return the first item matching the predicate, or default if nothing matches default for a reference type is null that means you are assingning null to User user, which is declared as non-nullable you must either change this to use First so it never returns null, or change the return value to Task<User?> if its intended that null is an acceptable return value

Timo Martinson•5mo ago

Thank you. again!

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