C# (CSharp) WorkoutList.FirstOrDefault примеры использования

Пример #1

        private void LoadDay(Day day)
        {
            DayAdd = day;
            OnPropertyChanged("DayAdd");

            WorkoutAdd = WorkoutList.FirstOrDefault(p => p.Id == day.WorkoutId);
            OnPropertyChanged("WorkoutAdd");
        }

Пример #2

        private void LoadWorkoutExercise(WorkoutExercise workoutExercise)
        {
            WorkoutExerciseAdd = workoutExercise;
            OnPropertyChanged("WorkoutExerciseAdd");

            WorkoutAdd = WorkoutList.FirstOrDefault(p => p.Id == workoutExercise.WorkoutId);
            OnPropertyChanged("WorkoutAdd");
            ExerciseAdd = ExerciseList.FirstOrDefault(p => p.Id == workoutExercise.ExerciseId);
            OnPropertyChanged("ExerciseAdd");
        }