<PackageReference Include="System.Security.Cryptography.Pkcs" Version="10.0.12" />

System.Security.Cryptography.Pkcs.RecipientInfoEnumerator

public sealed class RecipientInfoEnumerator : IEnumerator
The RecipientInfoEnumerator class provides enumeration functionality for the RecipientInfoCollection collection. RecipientInfoEnumerator implements the IEnumerator interface.
namespace System.Security.Cryptography.Pkcs { public sealed class RecipientInfoEnumerator : IEnumerator { public RecipientInfo Current { get; } public bool MoveNext(); public void Reset(); } }