<PackageReference Include="NETStandard.Library" Version="2.0.2" />

System.AttributeTargets

public enum AttributeTargets
namespace System { public enum AttributeTargets { All = 32767, Assembly = 1, Class = 4, Constructor = 32, Delegate = 4096, Enum = 16, Event = 512, Field = 256, GenericParameter = 16384, Interface = 1024, Method = 64, Module = 2, Parameter = 2048, Property = 128, ReturnValue = 8192, Struct = 8 } }