I need assistance with getting the code that I already have in my listbox to show in ascending and descending order visual basic.net

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I'm new to Visual basic and still in the process of learning all of the ins and outs of this language. I'm struggling with trying to get what's already in my lstbox that was read in from a text file to sort in Ascending and Descending order from using an dropdown menu. I've done this with Radio buttons, but they were on a datagrid and for some odd reason my code isn't doing anything this time.

What I have tried:

Dim ascNames() As String = IO.File.ReadAllLines("file.txt")

Dim ascQuery = From asc In ascNames
Order by ascName.Lendth Ascending, ascName Descending

Posted 23-Apr-18 16:36pm

Member 13794742

Updated 24-Apr-18 2:09am

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phil.o · Answer 1 · 2018-04-23T16:55:00

Issues are underlined:

VB

Dim ascQuery = From asc In ascNames
Order by ascName.Lendth Ascending, ascName Descending
...

wouls rather be

VB

Dim ascQuery = From asc In ascNames
               Order By asc.Length Ascending, asc Descending
               Select asc

- Variable name is asc, its type is string.
- It is sorted by ascending length (Length property of string object) and descending value.
- There must be a Select statement.

Kindly.

Maciej Los · Answer 2 · 2018-04-24T02:11:00

In addition to soultion #1 by phil.o[^], a lambda version of solution:

VB

Dim ascQry1 = ascNames.OrderBy(Function(x) x.Length).ThenByDescending(Function(x) x)

For further details, please see:
Enumerable.OrderBy(TSource, TKey) Method (IEnumerable(TSource), Func(TSource, TKey)) (System.Linq)[^]
Enumerable.OrderByDescending(TSource, TKey) Method (IEnumerable(TSource), Func(TSource, TKey), IComparer(TKey)) (System.Linq)[^]
Enumerable.ThenBy Method (System.Linq)[^]
Enumerable.ThenByDescending Method (System.Linq)[^]

Good luck!

I need assistance with getting the code that I already have in my listbox to show in ascending and descending order visual basic.net

2 solutions

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