<PackageReference Include="System.Diagnostics.EventLog" Version="10.0.0-rc.1.25451.107" />

System.Diagnostics.Eventing.Reader.EventBookmark

public sealed class EventBookmark
Represents a placeholder (bookmark) within an event stream. You can use the placeholder to mark a position and return to this position in a stream of events. An instance of this object can be obtained from an EventRecord object, in which case it corresponds to the position of that event record.
namespace System.Diagnostics.Eventing.Reader { public sealed class EventBookmark { public string BookmarkXml { get; } public EventBookmark(string bookmarkXml); } }