Possible null reference argument for parameter 'learningContent' in 'LearningElementPe.LearningElementPe(string name, ILearningContentPe learningContent, string description, string goals, LearningElementDifficultyEnum difficulty, ElementModel elementModel, int workload = 0, int points = 1, double positionX = 0, double positionY = 0)'.

Non-nullable property 'StoryEle1' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the property as nullable.

Non-nullable property 'StoryEle2' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the property as nullable.

Non-nullable property 'Ele1' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the property as nullable.

Possible null reference return.

Dereference of a possibly null reference.

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

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