sort list with C# by how often same strings appear in list

Question

I have a list:

dave
maggie
john
stuart
john
john
dave
john
maggie
maggie

My desired result would be:

john
john
john
john
maggie
maggie
maggie
dave
dave
stuart

Possible duplicate of [Sort a Nested string list in C#](https://stackoverflow.com/questions/32547077/sort-a-nested-string-list-in-c-sharp) — Parth Savadiya, Oct 03 '19 at 07:08
you can put your logic , the hint is given here https://stackoverflow.com/questions/5211194/count-occurrences-of-words-in-arraylist — Faizan, Oct 03 '19 at 07:09

score 6 · Accepted Answer · answered Oct 03 '19 at 07:04

6

First I group them. Then order them by the count from each group. Lastly use SelectMany to get a flat structure from each individual name in the groups.

var myList = new List<string>()
{
    "dave",
    "maggie",
    "john",
    "stuart",
    "john",
    "dave",
    "john",
};

var result = myList
    .GroupBy(x => x)
    .OrderByDescending(x => x.Count())
    .SelectMany(x => x)
    .ToList();

answered Oct 03 '19 at 07:04

NotFound

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@Stefan yes. `SelectMany` takes a function returning a `IEnumerable` and `GroupBy` returns an `IEnumerable`. – NotFound Oct 03 '19 at 07:20

sort list with C# by how often same strings appear in list

1 Answers1