Wait for pooled threads to complete

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Try this. The function takes in a list of Action delegates. It will add a ThreadPool worker entry for each item in the list. It will wait for every action to complete before returning.

public static void SpawnAndWait(IEnumerable<Action> actions)
{
    var list = actions.ToList();
    var handles = new ManualResetEvent[actions.Count()];
    for (var i = 0; i < list.Count; i++)
    {
        handles[i] = new ManualResetEvent(false);
        var currentAction = list[i];
        var currentHandle = handles[i];
        Action wrappedAction = () => { try { currentAction(); } finally { currentHandle.Set(); } };
        ThreadPool.QueueUserWorkItem(x => wrappedAction());
    }

    WaitHandle.WaitAll(handles);
}

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