如何转换IEnumerable <IEnumerable<IGrouping<int,string> &gt;&gt;到IEnumerable <IEnumerable<string> &gt;

Question

I'm trying to partition some comma separated lines into groups of size 2 at max. How can i convert the collection of groups to list of lists as below? I expect the partitions to be 3 first and then 4 after grouping.

  List<string> chunk = new List<string>()
            {
                "a,b,c",
                "a,d,e",
                "b,c,d",
                "b,e,d",
                "b,f,g",
                "e"
            };

            var partitons = chunk.GroupBy(c => c.Split(',')[0], (key, g) => g);
            var groups = partitons.Select(x => x.Select((i, index) => new { i, index }).GroupBy(g => g.index / 2, e => e.i));
            IEnumerable<IEnumerable<string>> parts = groups.Select(???)

Answer 1

这就是我想要的

var parts = groups.SelectMany(x => x).Select(y => y.Select(z => z));

Answer 2

Try this:

partitons = groups.Select(x => x.SelectMany(y => y));

I get this: