Possible null reference assignment.

Cannot convert null literal to non-nullable reference type.

Cannot convert null literal to non-nullable reference type.

'Exception.Exception(SerializationInfo, StreamingContext)' is obsolete: 'This API supports obsolete formatter-based serialization. It should not be called or extended by application code.' (https://aka.ms/dotnet-warnings/SYSLIB0051)

Possible null reference assignment.

Nullability of type of parameter 'obj' doesn't match overridden member (possibly because of nullability attributes).

Non-nullable field '_context' must contain a non-null value when exiting constructor. Consider declaring the field as nullable.

Possible null reference assignment.

Cannot convert null literal to non-nullable reference type.