https://learn.microsoft.com/en-us/dotnet/api/system.componentmodel.design.componentdesigner.system-componentmodel-design-idesignerfilter-prefilterattributes?view=netframework-4.8.1&viewFallbackFrom=windowsdesktop-8.0
ComponentDesigner.IDesignerFilter.PreFilterAttributes(IDictionary) Method...
For a description of this member, see the PreFilterAttributes(IDictionary) method.
idictionarymethod