Dereference of a possibly null reference.

Dereference of a possibly null reference.

Possible null reference argument for parameter 'artist' in 'string DataController.GetMusicKey(string songName, string artist, string songType)'.

Possible null reference argument for parameter 'songType' in 'string DataController.GetMusicKey(string songName, string artist, string songType)'.

Possible null reference argument for parameter 'artist' in 'string DataController.GetMusicKey(string songName, string artist, string songType)'.

Possible null reference argument for parameter 'songType' in 'string DataController.GetMusicKey(string songName, string artist, string songType)'.

Converting null literal or possible null value to non-nullable type.

Possible null reference argument for parameter 'album' in 'string DataController.GetAlbumName(string? artist, string album)'.

Possible null reference argument for parameter 'key' in 'bool Dictionary<string, Album>.ContainsKey(string key)'.

Possible null reference argument for parameter 'key' in 'void Dictionary<string, Album>.Add(string key, Album value)'.

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

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

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

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

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

Converting null literal or possible null value to non-nullable type.

Cannot convert null literal to non-nullable reference type.

Dereference of a possibly null reference.

Dereference of a possibly null reference.