<PackageReference Include="System.Reactive" Version="7.0.0-preview.1" />

System.Reactive.Subjects.ReplaySubject<T>

public sealed class ReplaySubject<T> : SubjectBase<T>
namespace System.Reactive.Subjects { public sealed class ReplaySubject<[Nullable(2)] T> : SubjectBase<T> { public ReplaySubject(); public ReplaySubject(IScheduler scheduler); public ReplaySubject(int bufferSize); public ReplaySubject(int bufferSize, IScheduler scheduler); public ReplaySubject(TimeSpan window); public ReplaySubject(TimeSpan window, IScheduler scheduler); public ReplaySubject(int bufferSize, TimeSpan window); public ReplaySubject(int bufferSize, TimeSpan window, IScheduler scheduler); } }