net6.0-windows 
namespace System.DirectoryServices.AccountManagement
{
    public class PrincipalCollection : ICollection<Principal>, IEnumerable, IEnumerable<Principal>, ICollection
    {
        public bool Contains(UserPrincipal user);
    }
}
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.NET 5.06.07.08.09.010.0
.NET Core 2.02.12.23.03.1
.NET Framework 3.54.04.54.5.14.5.24.64.6.14.6.24.74.7.14.7.24.84.8.1
.NET Standard 2.02.1
Information specific to net6.0
Assembly

System.DirectoryServices.AccountManagement , Version=4.0.0.0, PublicKeyToken=b77a5c561934e089

Referencing

Your project needs a package reference to System.DirectoryServices.AccountManagement.

Package System.DirectoryServices.AccountManagement (10.0.0-preview.1.25080.5) netstandard2.0
Platform Restrictions

This API is only supported on the following platforms:

  • Windows
  • Built-in API
  • Package-provided API