Bitwise-or operator used on a sign-extended operand; consider casting to a smaller unsigned type first

The field 'BinaryReader.byteOrder' is never used

The field 'BinaryReader._floatByteMapBuffer' is assigned but its value is never used

The field 'BinaryReader._doubleByteMapBuffer' is assigned but its value is never used

The field 'BinaryWriter._textCharacterWidth' is assigned but its value is never used

'Encoding.UTF7' is obsolete: 'The UTF-7 encoding is insecure and should not be used. Consider using UTF-8 instead.' (https://aka.ms/dotnet-warnings/SYSLIB0001)

The variable 'ex' is declared but never used

The variable 'ex2' is declared but never used

The variable 'ex' is declared but never used