The switch expression does not handle all possible values of its input type (it is not exhaustive). For example, the pattern 'System.TypeCode.Empty' is not covered.

The switch expression does not handle all possible values of its input type (it is not exhaustive). For example, the pattern 'System.TypeCode.Empty' is not covered.

Possible null reference assignment.

Nullability of reference types in value of type 'DelayedEnumerator<T>' doesn't match target type 'IEnumerator<T>'.

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

The switch expression does not handle all possible values of its input type (it is not exhaustive). For example, the pattern 'ChartTools.FileType.MIDI' is not covered.

The switch expression does not handle some values of its input type (it is not exhaustive) involving an unnamed enum value. For example, the pattern '(ChartTools.GHLLane)7' is not covered.

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

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