How to make ( group by ) in ( directory = folder ) by C# ?

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How to make ( Group by ) in ( Directory = Folder ) by C# ? ( or any other way )

Such as Group by Type , Date or Size ?

I have a lot of folders and I need to sort all of them by Type.

This is my picture for more details.

https://i.stack.imgur.com/PXXt2.png[^]

What I have tried:

I Can't Find Any Code and ask a lot of people

Posted 17-Aug-19 23:14pm

Member 13812839

Updated 18-Aug-19 0:32am

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Richard Deeming 22-Aug-19 9:48am

Do you want to read a grouped list of files in C#? Or are you looking to change the Windows Explorer "group by" option from C#?

Richard Deeming 22-Aug-19 10:00am

If you want to change the Windows Explorer view, there's some code in this StackOverflow thread[^] to do that. It's in Delphi - I'm not sure how easy it would be to convert it to C#.

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OriginalGriff · Accepted Answer · 2019-08-18T00:32:00

Solution 1

Try this:

C#

DirectoryInfo di = new DirectoryInfo(@"D:\Test Data");
FileInfo[] info = di.GetFiles();
Dictionary<string, List<FileInfo>> byType = info.GroupBy(i => i.Extension).ToDictionary(g => g.Key, g => g.ToList());

Posted 18-Aug-19 0:32am

OriginalGriff

Comments

Maciej Los 19-Aug-19 2:04am

5ed!

OriginalGriff 19-Aug-19 2:17am

Embarrassingly, I had to work out how to do this from scratch - because I forgot until this morning that I wrote a tip on how to do this five years ago:

https://www.codeproject.com/Tips/778786/Using-Linq-to-create-a-Dictionary-of-sub-Lists-by

:sigh:

Maciej Los 19-Aug-19 2:48am

:laugh:

Richard Deeming 22-Aug-19 9:46am

I'd be inclined to use EnumerateFiles instead of GetFiles. GroupBy just enumerates over everything anyway, so there's no benefit to reading all of the files into an array first. :)