https://learn.microsoft.com/ja-jp/dotnet/api/system.security.permissions.reflectionpermission?view=netframework-4.8.1&viewFallbackFrom=windowsdesktop-10.0
ReflectionPermission Class (System.Security.Permissions) | Microsoft Learn
Controls access to non-public types and members through the System.Reflection APIs. Controls some features of the System.Reflection.Emit APIs.
class systemsecuritypermissionsmicrosoftlearn