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.NET 2005 Parallel ArrayLists - Sorting

Posted on 2007-04-01
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Last Modified: 2013-11-26
I have two ArrayLists in a .NET 2005 class. One stores a list of candidates. The other, the number of votes that they have. I'm trying to now write a function that will return a formatted result for the number of votes each candidate has. Obviously I could leave them in the order in which they were input (which I suppose would work okay), but it seems logical to want to put the winner at the top with the number of votes they received and a percentage. How can I sort both lists so that each entry winds up staying in the same position as the corresponding number of votes?
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Question by:carter_jl
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LVL 85

Expert Comment

by:Mike Tomlinson
ID: 18833864
This just begs the question...

Why is the data in two different ArrayLists?

Put that data TOGETHER into a custom class that implements IComparer:
http://msdn2.microsoft.com/en-us/library/system.collections.icomparer.aspx

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Author Comment

by:carter_jl
ID: 18834127
My bad on the wrong TA.

Point taken on writing a custom class. I'm still not sure if I want to do that since it won't really be reusable in other "Election"-type classes I'll be writing. However, I don't understand how the IComparer helps me at all.
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LVL 85

Expert Comment

by:Mike Tomlinson
ID: 18837105
Unfortunately I don't code in C++ (I think that's what you're using?)...

Here is an example in VB.Net, hope you can make sense of it.

Output:
Avatar with 500 vote(s)
Danny Phantom with 100 vote(s)
Jimmy Neutron with 75 vote(s)
SpongeBob with 1 vote(s)

Public Class Form1

    Public Class VotingResults
        Implements IComparable

        Public Candidate As String
        Public Votes As Integer

        Public Sub New(ByVal Candidate As String, ByVal Votes As Integer)
            Me.Candidate = Candidate
            Me.Votes = Votes
        End Sub

        Public Function CompareTo(ByVal obj As Object) As Integer Implements System.IComparable.CompareTo
            Dim vr As VotingResults = CType(obj, VotingResults)
            Return vr.Votes.CompareTo(Me.Votes)
        End Function

    End Class

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim results As New ArrayList
        results.Add(New VotingResults("SpongeBob", 1))
        results.Add(New VotingResults("Danny Phantom", 100))
        results.Add(New VotingResults("Avatar", 500))
        results.Add(New VotingResults("Jimmy Neutron", 75))
        results.Sort()

        For Each vr As VotingResults In results
            Debug.Print(vr.Candidate & " with " & vr.Votes & " vote(s)")
        Next
    End Sub

End Class
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LVL 85

Expert Comment

by:Mike Tomlinson
ID: 18837176
*I'm acutally using IComparable instead of IComparer...
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Author Comment

by:carter_jl
ID: 18840320
I can make some sense of that, but since I'm relatively new to .NET (especially C++ CLI), I'm unsure of how to translate that to C++
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LVL 85

Expert Comment

by:Mike Tomlinson
ID: 18840328
I can translate to C# if you like...don't know how much that would help you....
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Author Comment

by:carter_jl
ID: 18840415
Might be worth a shot
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LVL 85

Accepted Solution

by:
Mike Tomlinson earned 500 total points
ID: 18840630
Here is the C# version:

    public partial class Form1 : Form
    {

        public Form1()
        {
            InitializeComponent();
        }

        private class VotingResults : IComparable
        {

            public string Candidate;
            public int Votes;

            public VotingResults(string Candidate, int Votes)
            {
                this.Candidate = Candidate;
                this.Votes = Votes;
            }

            public int CompareTo(object obj)
            {
                VotingResults vr = (VotingResults)obj;
                return vr.Votes.CompareTo(this.Votes);
            }
        }

        private void button1_Click_1(object sender, EventArgs e)
        {
            ArrayList results = new ArrayList();
            results.Add(new VotingResults("SpongeBob", 1));
            results.Add(new VotingResults("Danny Phantom", 100));
            results.Add(new VotingResults("Avatar", 500));
            results.Add(new VotingResults("Jimmy Neutron", 75));
            results.Sort();

            foreach (VotingResults vr in results)
            {
                Debug.Print(vr.Candidate + " with " + vr.Votes + " vote(s)");
            }              
        }

    }
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