Non-nullable property 'PostPhotos' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the property as nullable.

Dereference of a possibly null reference.

Possible null reference return.

Possible null reference return.

Possible null reference return.

Non-nullable field '_mapper' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the field as nullable.

Possible null reference return.

Possible null reference argument for parameter 'roles' in 'Task<IdentityResult> UserManager<User>.AddToRolesAsync(User user, IEnumerable<string> roles)'.

Dereference of a possibly null reference.

'WebRequest.Create(string)' is obsolete: 'WebRequest, HttpWebRequest, ServicePoint, and WebClient are obsolete. Use HttpClient instead.' (https://aka.ms/dotnet-warnings/SYSLIB0014)

The "--output" option isn't supported when building a solution. Specifying a solution-level output path results in all projects copying outputs to the same directory, which can lead to inconsistent builds.