<PackageReference Include="System.Diagnostics.EventLog" Version="8.0.0-preview.3.23174.8" />

EventOpcode

public sealed class EventOpcode
Contains an event opcode that is defined in an event provider. An opcode defines a numeric value that identifies the activity or a point within an activity that the application was performing when it raised the event.
namespace System.Diagnostics.Eventing.Reader { public sealed class EventOpcode { public string DisplayName { get { throw new PlatformNotSupportedException(System.SR.PlatformNotSupported_EventLog); } } public string Name { get { throw new PlatformNotSupportedException(System.SR.PlatformNotSupported_EventLog); } } public int Value { get { throw new PlatformNotSupportedException(System.SR.PlatformNotSupported_EventLog); } } internal EventOpcode() { throw new PlatformNotSupportedException(System.SR.PlatformNotSupported_EventLog); } } }