Question

I need my sorted list to sort Desc, instead of Ascending

Asked by: indy500fan

Friends,

I have my code below...

I am wanting to display my data in Descending order instead of Asending.  Any Ideas?

Thanks in advance!

Best Regards,
Eric

Dim EntrantPoints As SortedList(Of Double, String)    
 
Private Sub ListEntrantPoints()
        Dim li As ListViewItem
        'EntrantPoints.Reverse()
        For Each SortedValue In EntrantPoints
            Dim SplitUpString() As String
            SplitUpString = Split(SortedValue.Value.ToString, "-")
            li = lvPitOrder.Items.Add(SplitUpString(0))
            li.SubItems.Add(SplitUpString(1))
            li.SubItems.Add(SplitUpString(2))
            li.SubItems.Add(SplitUpString(3))
        Next
    End Sub
                                  
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Asked On
2009-04-23 at 04:58:19ID24348530
Topic

Microsoft Visual Basic.Net

Participating Experts
4
Points
500
Comments
16

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Answers

 

by: vs1784Posted on 2009-04-23 at 05:04:56ID: 24214047

 

by: vs1784Posted on 2009-04-23 at 05:05:39ID: 24214050

In short you need to use the SortedList constructor that takes an IComparer as in argument.
Then just pass in an IComparer that sorts your items in the order that you want.

 

by: indy500fanPosted on 2009-04-23 at 05:06:29ID: 24214058

Uh, okay.  I'm never very good at converting C#.  How do I apply this to my example?  

 

by: DhaestPosted on 2009-04-23 at 05:07:14ID: 24214063

 

by: vs1784Posted on 2009-04-23 at 05:08:39ID: 24214070

 

by: indy500fanPosted on 2009-04-23 at 05:10:59ID: 24214090

Everyone.  Maybe I should have been more specific.  Can I get specific code help with my example?

I've looked at these but I can't figure out how to implement.  For 500 points, I am looking for help with my example rather than links.

Best Regards,
Eric

 

by: vs1784Posted on 2009-04-23 at 05:16:38ID: 24214129

What type of data is being stored in sortedlist ? string, int?

 

by: indy500fanPosted on 2009-04-23 at 05:16:42ID: 24214131

I do like that conversion tool that's neat!.  When I converted suggestions to vb, I guess I'm not sure how to implement in my example.

 

by: indy500fanPosted on 2009-04-23 at 05:21:16ID: 24214154

vs1784, the key is double and the value is a string

 

by: indy500fanPosted on 2009-04-23 at 05:30:29ID: 24214220

"In short you need to use the SortedList constructor that takes an IComparer as in argument.
Then just pass in an IComparer that sorts your items in the order that you want."

Okay.  How do I do that?

 

by: indy500fanPosted on 2009-04-23 at 05:31:50ID: 24214232

It sounds similar to what you had in the example you sent in your first suggestion.  I tried you code converter to try and implement, but could not get it to work.

 

by: webtubbsPosted on 2009-04-23 at 05:35:24ID: 24214264

What about looping through the SortedList in reverse??

    Dim EntrantPoints As SortedList(Of Double, String)
 
    Private Sub ListEntrantPoints()
        Dim li As ListViewItem
        For i As Integer = EntrantPoints.Count - 1 To 0 Step -1
            Dim SplitUpString() As String
            SplitUpString = EntrantPoints.Values(i).ToString.Split("-"c)
            li = lvPitOrder.Items.Add(SplitUpString(0))
            li.SubItems.Add(SplitUpString(1))
            li.SubItems.Add(SplitUpString(2))
            li.SubItems.Add(SplitUpString(3))
        Next
    End Sub

                                              
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by: indy500fanPosted on 2009-04-23 at 05:37:04ID: 24214281

Bingo!

That'll work!

 

by: Idle_MindPosted on 2009-04-23 at 09:05:06ID: 24216672

Hi indy500fan,

I've been forcing myself to learn LINQ and thought your question would be a good  candidate!  LINQ is available in VB.Net 2008 (.Net 3.0 and above)...

So below is an alternate solution for you presented in a simple example.

Here is the output:

Default Order: (Ascending)
1 --> D
2 --> C
3 --> B
3.5 --> B+
4 --> A
Reversed Order: (Descending)
4 --> A
3.5 --> B+
3 --> B
2 --> C
1 --> D

Public Class Form1
 
    Dim EntrantPoints As New SortedList(Of Double, String)
 
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        EntrantPoints.Add(2.0, "C")
        EntrantPoints.Add(3.0, "B")
        EntrantPoints.Add(1.0, "D")
        EntrantPoints.Add(4.0, "A")
        EntrantPoints.Add(3.5, "B+")
    End Sub
 
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Debug.Print("Default Order: (Ascending)")
        For Each pair In EntrantPoints
            Debug.Print(pair.Key & " --> " & pair.Value)
        Next
 
        Dim reversed = From p As KeyValuePair(Of Double, String) In EntrantPoints Order By p.Key Descending Select p
        Debug.Print("Reversed Order: (Descending)")
        For Each pair In reversed
            Debug.Print(pair.Key & " --> " & pair.Value)
        Next
    End Sub
 
End Class
                                              
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by: indy500fanPosted on 2009-04-23 at 09:11:13ID: 24216739

Idle Mind,

It's been a while.  Your solution looks interesting.  I'll have to try it in my implemetation.

 

by: webtubbsPosted on 2009-04-24 at 01:06:13ID: 24222739

Idle_Mind - that looks pretty cool! I'll have to look into LINQ myself.

20120131-EE-VQP-002

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