Wsrtjtyk

For an assignment I'm stuck on this part. I'm as beginner a beginner programmer can be.

So I have an array attached to a listbox. This is the declaration of the array:

        number = new decimal[5];

        number[0] = 0.10m;

        number[1] = 0.20m;

        number[2] = 0.30m;

        number[3] = 0.40m;  

        number[4] = 0.50m;

And this is how I attached the array to the listbox

        lstNumbers.Items.Add(number[0]);

        lstNumbers.Items.Add(number[1]);

        lstNumbers.Items.Add(number[2]);

        lstNumbers.Items.Add(number[3]);

        lstNumbers.Items.Add(number[4]);

Since it's a listbox, these items(/values?) will be clicked on. I need to give each number their own index. Number[0] is 0.10 so index should be 010. How should I do this?

Another problem I'm having trouble solving is this: Each time you click on any of these items, it's kept track in an array and in the console. Example, if you click 0.10 once, this appears in Console: "0.10, 1 time." Click 3 times, Console should say: "0.10, 1 time. 0.10, 2 times. 0.10, 3 times."

I was told an associative array could help, but I'm not sure how this should look like. Tried searching for it, but mostly it's for PHP and the few for C# go a bit too complicated.

Here's to hoping anyone is able to help me out a little.

Ok lets start with the first. If you are using a windows form you can set the project to have a console output along with your windows form.

This is achieved by:

Right click your project -> Select Properties.Change the output type to Console Application.

How to have an array that uses string as index? Simple use a Dictionary.

       Dictionary<string, decimal> number = new Dictionary<string, decimal>();



        number["010"] = 0.10m;

        number["020"] = 0.20m;

        number["030"] = 0.30m;

        number["040"] = 0.40m;

        number["050"] = 0.50m;



        this.myListBox.Items.Add(number["010"]);

        this.myListBox.Items.Add(number["020"]);

        this.myListBox.Items.Add(number["030"]);

        this.myListBox.Items.Add(number["040"]);

        this.myListBox.Items.Add(number["050"]);

Last point is very straight forward. Attach a SelectIndexChanged event to your listbox and keep track of the selected item:

    private void myListBox_SelectedIndexChanged(object sender, EventArgs e)

    {

        var item = this.myListBox.SelectedItem.ToString();

        if(!tracking.Select(x=> x.Key == item).Any())

        {

            tracking.Add(new KeyValuePair<string, int>(item, 1));

            Console.WriteLine(item + " has been selected once");

        }

        else

        {

            var currentItem = tracking.SingleOrDefault(x => x.Key == item);

            var value = currentItem.Value;

            tracking.Remove(currentItem);

            value++;

            tracking.Add(new KeyValuePair<string, int>(item, value));

            Console.Clear();

            Console.WriteLine(item + " has been selected " + value + " times");

        }

    }

The variable tracking has been declared as following:

public partial class Form1 : Form

{

    List<KeyValuePair<string, int>> tracking = new List<KeyValuePair<string, int>>();

    public Form1()

    {

        InitializeComponent();



        Dictionary<string, decimal> number = new Dictionary<string, decimal>();



        number["010"] = 0.10m;

        number["020"] = 0.20m;

EDIT

As the dictionary cannot be used and also the application is WPF here is another solution.

Again you can use the first step showed to have a WPF solution with a console output:
Right click your project -> Select Properties.Change the output type to Console Application.

To have a collection that uses an object as an index is to use an Hashtable.

Here is your main:

public partial class MainWindow : Window

{

    List<KeyValuePair<string, int>> tracking = new List<KeyValuePair<string, int>>();

    public MainWindow()

    {

        InitializeComponent();



        Hashtable numbers = new Hashtable();



        numbers.Add("010", 0.10m);

        numbers.Add("020", 0.20m);

        numbers.Add("030", 0.30m);

        numbers.Add("040", 0.40m);

        numbers.Add("050", 0.50m);



        List<decimal> items = new List<decimal>();

        items.Add(Convert.ToDecimal(numbers["010"]));

        items.Add(Convert.ToDecimal(numbers["020"]));

        items.Add(Convert.ToDecimal(numbers["030"]));

        items.Add(Convert.ToDecimal(numbers["040"]));

        items.Add(Convert.ToDecimal(numbers["050"]));



        lbTodoList.ItemsSource = items;

    }



    private void lbTodoList_SelectionChanged(object sender, SelectionChangedEventArgs e)

    {

        var item = this.lbTodoList.SelectedItem.ToString();

        if (!tracking.Select(x => x.Key == item).Any())

        {

            tracking.Add(new KeyValuePair<string, int>(item, 1));

            Console.WriteLine(item + " has been selected once");

        }

        else

        {

            var currentItem = tracking.SingleOrDefault(x => x.Key == item);

            var value = currentItem.Value;

            tracking.Remove(currentItem);

            value++;

            tracking.Add(new KeyValuePair<string, int>(item, value));

            Console.Clear();

            Console.WriteLine(item + " has been selected " + value + " times");

        }

    }

}

Your XAML should be as simple as:

<Grid>

    <ListBox  Name="lbTodoList" HorizontalAlignment="Left" Height="154" Margin="145,56,0,0" VerticalAlignment="Top" Width="277" SelectionChanged="lbTodoList_SelectionChanged"/>

</Grid>

Remeber to Attach a SelectIndexChanged event to your listbox and keep track of the selected item.

Thanks for the help so far, I'm getting closer to completing my assignment. Nice since it's due to midnight today.

Got a (hopefully final) question.

So I got two listboxes right now. ListBox 1 has an enum attached. In this enum are items that have a value (different for each item). We also have the second listbox where these numbers appear in. What I'm trying to figure out:

Item1 from Listbox1 has a value of 1.70. If you click 0.50 in Listbox2 4 times, then the total value should be 2.00. When the value of the numbers is equal or greater then the value of Listbox1, a message will appear in a label and if you went over the value of Listbox1, then it will also say how many of the other numbers (in this case, 1 of 0.10 and 1 of 0.20) will be returned.

PS: Those numbers are actually coins and I'm trying to code a distribution machine (so the items are food/drinks) but I changed stuff a little to make sure I could learn from the given answers.