Question

Need Help with LINQ to get multiple values out of a Hashtable for the top 5 entities

Asked by: indy500fan

Friends,

I need help with Linq, to get multiple values out of a Hashtable for the Top 5 TotalRaceRankFactor_Entrant

You can see below how I declared the values in the class, attached to that hashtable...

I would think the Link would be something like:

        For Each Entrant (From Entrants In PointsInfo_HT Order By Entrants.TotalRaceRankFactor_Entrant Descending Select Top 5 Entrants)
               Dim PointsInfo as new clsCompletePointsInfo
               Dim CarNumber as String = PointsInfo.CarNumber
               ...
        Next

Does this make sense?

If I were to use SQL, the syntax would be:

Select Top 5 TotalRaceRankFactor_entrant,
CarNumber,
FName,
LastName,
Team,
TotalEntrantPoints
From PointsInfo
Order By TotalRaceRankFactor_entrant DESC

Thanks in Advance!

Best Regards,
Eric

Public Class clsCompletePointsInfo
    Public DriverID As String
    Public EntrantID As String
    'Rank = 0
    Public TotalEntrantPoints As Integer
    Public TotalDriverPoints As Integer
    Public CarNumber As String
    Public FName As String
    Public LName As String
    Public Team As String
    Public TotalRaceRankFactor_Entrant As Decimal
    'Comment = ""
End Class

                                  
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Asked On
2009-09-16 at 22:36:17ID24738783
Topics

Language Integrated Query - LINQ

,

Microsoft Visual Basic.Net

Participating Experts
2
Points
500
Comments
10

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Answers

 

by: naspinskiPosted on 2009-09-16 at 22:52:20ID: 25353147

var query = (from TotalRaceRankFactor_entrant in PointsInfo 
 orderby TotalRaceRankFactor_entrant descending
 select new {
  TotalRaceRankFactor_entrant.CarNumber,
  TotalRaceRankFactor_entrant.FName,
  TotalRaceRankFactor_entrant.LastName,
  TotalRaceRankFactor_entrant.Team,
  TotalRaceRankFactor_entrant.TotalEntrantPoints
 }).Take(5);

                                              
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by: naspinskiPosted on 2009-09-16 at 22:56:18ID: 25353159

could also be written cleaner in a few ways:

//not quite as efficient, but cleaner:
var query = PointsInfo.OrderByDescending(x => x).Take(5);
 
//obfuscated a bit
var query = (from t in PointsInfo 
 orderby t descending
 select new {
  t.CarNumber, t.FName, t.LastName, 
  t.Team, t.TotalEntrantPoints
 }).Take(5);
                                              
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by: philipjonathanPosted on 2009-09-16 at 22:56:41ID: 25353162

Try:

Dim top5Entrants =
    From Entrants In PointsInfo_HT Order _
    Select Entrants _
    Order By Entrants.TotalRaceRankFactor_Entrant Descending _
    Take 5

For Each Entrant In top5Entrants
               Dim PointsInfo as new clsCompletePointsInfo
               Dim CarNumber as String = PointsInfo.CarNumber
               ...
Next

 

by: indy500fanPosted on 2009-09-17 at 18:21:28ID: 25362424

Okay, I think I didn't explain something correctly, but philipjonathan is the closest so far.

THe ordery by Entrants.TotalRaceRankFactor_Entrant doesn't work, because I haven't defined TotalRaceRankFactor_entrant anywhere.  

Error      1      'TotalRaceRankFactor_Entrant' is not a member of 'System.Collections.Generic.KeyValuePair(Of String, PointsChampionshipCalculator2009.clsCompletePointsInfo)'.      

Also, I am using VB.NET

Thanks!  Eric

 

by: philipjonathanPosted on 2009-09-17 at 18:51:02ID: 25362493

What is the declaration of PointsInfo_HT?

Btw, there was a typo in my comment previously. The 2nd line should be:
    From Entrants In PointsInfo_HT _
without 'Order'

 

by: indy500fanPosted on 2009-09-17 at 19:41:50ID: 25362628

Points_HT:

Public Class ICPC

    Dim PointsInfo_HT As New Dictionary(Of String, clsCompletePointsInfo)
...

Public Class clsCompletePointsInfo
    Public DriverID As String
    Public EntrantID As String
    'Rank = 0
    Public TotalEntrantPoints As Integer
    Public TotalDriverPoints As Integer
    Public CarNumber As String
    Public FName As String
    Public LName As String
    Public Team As String
    Public TotalRaceRankFactor_Entrant As Decimal
    'Comment = ""
End Class

 

by: indy500fanPosted on 2009-09-17 at 20:08:58ID: 25362705

       Dim PointsInfo As New clsCompletePointsInfo
        Dim top5Entrants = From Entrants In PointsInfo_HT Select Entrants Order By PointsInfo.TotalRaceRankFactor_Entrant Descending Take 5

        For Each Entrant In top5Entrants
            Dim CarNumber As String = PointsInfo.CarNumber
        Next

THis seems to compile....Not sure if it will work, though... Haven't tried it yet.

 

by: philipjonathanPosted on 2009-09-17 at 20:40:20ID: 25362812

I don't think you can do it that way.
Try this:

Dim top5Entrants =
    From Entrants In PointsInfo_HT _
    Select Entrants _
    Order By Entrants.Value.TotalRaceRankFactor_Entrant Descending _
    Take 5
 
For Each Entrant In top5Entrants
               Dim PointsInfo as new clsCompletePointsInfo
               Dim CarNumber as String = PointsInfo.CarNumber
               ...
Next

                                              
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by: indy500fanPosted on 2009-09-17 at 22:18:43ID: 31629860

That works great!  Thanks!

 

by: indy500fanPosted on 2009-09-17 at 22:48:33ID: 25363158

FYI, I had to make a couple slight modifications, but your solution got me there...

Dim top5Entrants = From Entrants In PointsInfo_HT Select Entrants Order By Entrants.Value.TotalRaceRankFactor_Entrant Descending Take 5
        Dim li As ListViewItem
        For Each Entrant In top5Entrants
                   Dim CarNumber As String = Entrant.Value.CarNumber
...

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