<PackageReference Include="System.Diagnostics.EventLog" Version="10.0.11" />

System.Diagnostics.Eventing.Reader.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 class EventLogQuery { public bool ReverseDirection { get; set; } public EventLogSession Session { get; set; } public bool TolerateQueryErrors { get; set; } public EventLogQuery(string path, PathType pathType); public EventLogQuery(string path, PathType pathType, string query); } }