<PackageReference Include="System.Security.Permissions" Version="10.0.0-preview.4.25258.110" />

AspNetHostingPermissionAttribute

Allows security actions for AspNetHostingPermission to be applied to code using declarative security. This class cannot be inherited.
using System.Security; using System.Security.Permissions; namespace System.Web { [AttributeUsage(AttributeTargets.All, AllowMultiple = true, Inherited = false)] public sealed class AspNetHostingPermissionAttribute : CodeAccessSecurityAttribute { public AspNetHostingPermissionLevel Level { get; set; } public AspNetHostingPermissionAttribute(SecurityAction action) : base(action) { } public override IPermission CreatePermission() { return null; } } }