Finding multiple mode in an array C#

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I was trying to find a mode of given array: [2,2,3,3,4,5]

Now thing is there's actually two most frequently occurs elements in the array which is 2,3 so the output should be

2 3

but my solution only provides one mode of the array which is 2.
Now my question is: How do I find multiple mode in array?

What I have tried:

int mode_val = values.GroupBy(v => v).OrderByDescending(g => g.Count()).First().Key;

Posted 20-Sep-22 3:34am

Dan Sep2022

Updated 20-Sep-22 9:31am

v2

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Member 15627495 20-Sep-22 9:45am

it's LINQ ( to entities )

try :

int mode_val = values.GroupBy(v => v).OrderByDescending(g => g.Count()).all().Key;

Dan Sep2022 20-Sep-22 10:02am

"No overload for method 'All' takes 0 arguments" Why did this ocurrs?

Richard MacCutchan 20-Sep-22 10:51am

See Enumerable.All<TSource>(IEnumerable<TSource>, Func<TSource,Boolean>) Method (System.Linq) | Microsoft Learn[^].

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George Swan · Accepted Answer · 2022-09-20T09:31:00

My suggestion is to group the array contents then sort the resulting group collection by the group.Count(). From the sorted groups select a collection of tuples of type (int Key,int Count).Use TakeWhile to select only the tuples that have the highest count value. Foreach key in the selection, write the value out to the console.

C#

static void Main()
   {
      int[] collection = new[] { 2, 2, 3, 3, 4, 5 };
      var tuples = collection.GroupBy(n => n)
                   .OrderByDescending(group => group.Count())
                    //select a collection of tuples (int Key,int Count)
                   .Select(group => (Key: group.Key, Count: group.Count())).ToArray();
      var selection = tuples.TakeWhile(x => x.Count == tuples[0].Count);
      foreach (var (Key, Count) in selection)
       {

         Console.WriteLine(Key);
       }
   }