<PackageReference Include="NETStandard.Library" Version="2.0.1" />

System.Security.Cryptography.X509Certificates.X509ChainElementCollection

namespace System.Security.Cryptography.X509Certificates { public sealed class X509ChainElementCollection : ICollection, IEnumerable { public int Count { get; } public bool IsSynchronized { get; } public X509ChainElement this[int index] { get; } public object SyncRoot { get; } public void CopyTo(X509ChainElement[] array, int index); public X509ChainElementEnumerator GetEnumerator(); } }