Hi Vladimir,
The "all" option is to pass null in the PageSizes collection. Have you tried that and does it meet your needs?
P.S. Or perhaps you need the "all" option to be set initially? In this case, setting a large number or int.MaxValue is a valid approach. The PageSize parameter expects an int, so it won't accept a null and we prefer to avoid a breaking change here.
Regards,
Dimo
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