[Solved] How to LINQ List and flatten it using SelectMany?

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Since you have a List<object> that actually contains List<List<Player>> and you want to get a list of players in one big list. Unfortunately for some external reason you are unable to change the API to give you sensibly typed data, you need to go through a couple of hoops. So given this:

List<object> players = <snip>;

You can extract a list of Player objects using SelectMany with some casting:

var allPlayers = players
    .SelectMany(list => (List<object>)list)
    .Cast<Player>();

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solved How to LINQ List> and flatten it using SelectMany?