Using directives should be ordered alphabetically by the namespaces (https://github.com/DotNetAnalyzers/StyleCopAnalyzers/blob/master/documentation/SA1210.md)

'TestImageProvider<TPixel>.TestImageProvider()' is obsolete: 'Called by the de-serializer; should only be called by deriving classes for de-serialization purposes'

'TestImageProvider<TPixel>.TestImageProvider()' is obsolete: 'Called by the de-serializer; should only be called by deriving classes for de-serialization purposes'

'TestImageProvider<TPixel>.TestImageProvider()' is obsolete: 'Called by the de-serializer; should only be called by deriving classes for de-serialization purposes'

'TestImageProvider<TPixel>.TestImageProvider()' is obsolete: 'Called by the de-serializer; should only be called by deriving classes for de-serialization purposes'

'TestImageProvider<TPixel>.TestImageProvider()' is obsolete: 'Called by the de-serializer; should only be called by deriving classes for de-serialization purposes'

'TestImageProvider<TPixel>.TestImageProvider()' is obsolete: 'Called by the de-serializer; should only be called by deriving classes for de-serialization purposes'

The variable 'xx' is assigned but its value is never used

The annotation for nullable reference types should only be used in code within a '#nullable' annotations context.

The annotation for nullable reference types should only be used in code within a '#nullable' annotations context.

'TestImageProvider<TPixel>.TestImageProvider()' is obsolete: 'Called by the de-serializer; should only be called by deriving classes for de-serialization purposes'

'TestImageProvider<TPixel>.TestImageProvider()' is obsolete: 'Called by the de-serializer; should only be called by deriving classes for de-serialization purposes'

'TestImageProvider<TPixel>.TestImageProvider()' is obsolete: 'Called by the de-serializer; should only be called by deriving classes for de-serialization purposes'

'TestImageProvider<TPixel>.TestImageProvider()' is obsolete: 'Called by the de-serializer; should only be called by deriving classes for de-serialization purposes'

'TestImageProvider<TPixel>.TestImageProvider()' is obsolete: 'Called by the de-serializer; should only be called by deriving classes for de-serialization purposes'

'TestImageProvider<TPixel>.TestImageProvider()' is obsolete: 'Called by the de-serializer; should only be called by deriving classes for de-serialization purposes'

The annotation for nullable reference types should only be used in code within a '#nullable' annotations context.

The annotation for nullable reference types should only be used in code within a '#nullable' annotations context.

Do not declare static members on generic types (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1000)