Get grouped values ​​separated by commas using linq

Question

I would like the third column to be "elements" with grouped values.

Dictionary<string, int> dic = new Dictionary<string, int>();
dic.Add("a", 1);
dic.Add("b", 1);
dic.Add("c", 2);
dic.Add("d", 3);

var dCounts =
    (from i in dic
    group i by i.Value into g
    select new { g.Key, count = g.Count()});

    var a = dCounts.Where(c => c.count>1 );

dCounts.Dump();
a.Dump();

This code results in:

Key Count
1   2
2   1
3   1

I would like to get the following results:

Key Count Items
1   2     a, b
2   1     c
3   1     d

Answer 1

    var dCounts =
        (from i in dic
            group i by i.Value into g
            select new { g.Key, count = g.Count(), Items = string.Join(",", g.Select(kvp => kvp.Key)) });

Use string.Join(",", {array})by passing in your key array.

Answer 2

You can use:

var dCounts = 
    from i in dic 
    group i by i.Value into g 
    select new { g.Key, Count = g.Count(), Values = g }; 

, ( g), Key, , IEnumerable<T>, . g, foreach LINQ.

, :

foreach(var el in dCounts) {
  Console.Write(" - {0}, count: {1}, values:", el.Key, el.Count);
  foreach(var item in el.Values) Console.Write("{0}, ", item);
|

Answer 3

from i in dic 
group i.Key by i.Value into g 
select new
{
  g.Key,
  count = g.Count(),
  items = string.Join(",", g.ToArray())
});