net10.0 
namespace System.Security.Cryptography.Pkcs
{
    public sealed class Rfc3161TimestampRequest
    {
        public Oid? RequestedPolicyId { get; }
    }
}
.NET
5.06.07.08.09.010.0
.NET Core
3.03.1
Information specific to net10.0
Assembly

System.Security.Cryptography.Pkcs , Version=10.0.0.0, PublicKeyToken=b03f5f7f11d50a3a

Referencing

Your project needs a package reference to System.Security.Cryptography.Pkcs.

Package System.Security.Cryptography.Pkcs (10.0.1) net10.0
Platform Restrictions

The property getter is supported on any platform except for these:

  • Browser
  • wasi
  • Built-in API
  • Package-provided API