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when i use this code in list page. then use Multi-Edit not work, in Multi-Edit page not show table data show only header.

// Page Load event
function Page_Load()
{
    $this->setRecordsPerPage(-1);
}

But i use $this->setRecordsPerPage(20); or default Multi-Edit work.

You need to check the page action first, e.g. you may check $this->isShow() (i.e. not $this->isMultiEdit() nor other actions).