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

System.Security.Permissions.SecurityAction

public enum SecurityAction
namespace System.Security.Permissions { public enum SecurityAction { Assert = 3, Demand = 2, [Obsolete("Deny is obsolete and will be removed in a future release of the .NET Framework. See http://go.microsoft.com/fwlink/?LinkID=155570 for more information.")] Deny = 4, InheritanceDemand = 7, LinkDemand = 6, PermitOnly = 5, [Obsolete("Assembly level declarative security is obsolete and is no longer enforced by the CLR by default. See http://go.microsoft.com/fwlink/?LinkID=155570 for more information.")] RequestMinimum = 8, [Obsolete("Assembly level declarative security is obsolete and is no longer enforced by the CLR by default. See http://go.microsoft.com/fwlink/?LinkID=155570 for more information.")] RequestOptional = 9, [Obsolete("Assembly level declarative security is obsolete and is no longer enforced by the CLR by default. See http://go.microsoft.com/fwlink/?LinkID=155570 for more information.")] RequestRefuse = 10 } }