Split List into Sublists with LINQ

Question

Is there any way I can separate a List into several separate lists of SomeObject, using the item index as the delimiter of each s

Answer 1

I took the primary answer and made it to be an IOC container to determine where to split. (For who is really looking to only split on 3 items, in reading this post while searching for an answer?)

This method allows one to split on any type of item as needed.

public static List> SplitOn(List main, Func splitOn)
{
    int groupIndex = 0;

    return main.Select( item => new 
                             { 
                               Group = (splitOn.Invoke(item) ? ++groupIndex : groupIndex), 
                               Value = item 
                             })
                .GroupBy( it2 => it2.Group)
                .Select(x => x.Select(v => v.Value).ToList())
                .ToList();
}

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So for the OP the code would be

var it = new List()
                       { "a", "g", "e", "w", "p", "s", "q", "f", "x", "y", "i", "m", "c" };

int index = 0; 
var result = SplitOn(it, (itm) => (index++ % 3) == 0 );