Get node id from a grid view
so after several hours i found the good solution !
Simple solution for people not new like me on drupal. lol

In my view I added the field "Content:id" of my content_type
And checked "Exclude from display"

In my plugin .php file in the method render(ResultRow $row) i got the famous id like this :

$nid = $this-&gt;getEntity($row)-&gt;id();  


that's all !!