<PackageReference Include="System.Security.Permissions" Version="5.0.0-preview.1.20120.5" />

FileDialogPermissionAttribute

Allows security actions for FileDialogPermission to be applied to code using declarative security. This class cannot be inherited.
namespace System.Security.Permissions { [AttributeUsage(AttributeTargets.Assembly | AttributeTargets.Class | AttributeTargets.Struct | AttributeTargets.Constructor | AttributeTargets.Method, AllowMultiple = true, Inherited = false)] public sealed class FileDialogPermissionAttribute : CodeAccessSecurityAttribute { public bool Open { get; set; } public bool Save { get; set; } public FileDialogPermissionAttribute(SecurityAction action) : base((SecurityAction)0) { } public override IPermission CreatePermission() { return null; } } }