https://learn.microsoft.com/pt-br/dotnet/api/system.configuration.settingsattributedictionary?view=windowsdesktop-10.0&viewFallbackFrom=netstandard-2.1
SettingsAttributeDictionary Class (System.Configuration) | Microsoft Learn
Represents a collection of key/value pairs used to describe a configuration object as well as a SettingsProperty object.
class systemconfigurationmicrosoftlearn