<PackageReference Include="NETStandard.Library" Version="2.0.3" />

System.Runtime.Serialization.StreamingContextStates

namespace System.Runtime.Serialization { public enum StreamingContextStates { All = 255, Clone = 64, CrossAppDomain = 128, CrossMachine = 2, CrossProcess = 1, File = 4, Other = 32, Persistence = 8, Remoting = 16 } }