C# Windows Forms – ListView – Fill From Hashtable

We will populate a ListView with a Hashtable. We also handle ItemSelection events for our ListView.

Let's go.

1. Create Empty Project

1. Open up Visual Studio and proceed over to File --> New Project
2. A new dialog popus up like this:

1. Give our empty project a name and click OK. An empty project will get generated for us.

2. Make project a Windows Project

Just right click on your project choose properties and set output type to Windows Application:

3.Program.cs

using System;
using System.Collections;
using System.Drawing;
using System.Windows.Forms;

namespace ListViewHashtable
{
    static class Program
    {
        private static ListView myListView;
        public static void Main()
        {
            setupListView();
            populateData();
            createMetroForm();
        }

        private static void createMetroForm()
        {
            Form myForm = new Form
            {
                Text = "WinForms ListView : Hashtable - //camposha.info",
                ClientSize = new Size(564, 520),
                BackColor = Color.Sienna
            };

            myForm.Controls.Add(myListView);
            Application.EnableVisualStyles();
            Application.Run(myForm);
        }
        private static void setupListView()
        {
            myListView = new ListView { Location = new Point(30, 70), Size = new Size(400, 400), View = View.Details, FullRowSelect = true, Alignment = ListViewAlignment.SnapToGrid };
            myListView.Columns.Add("NEBULAR", 200);
            myListView.Columns.Add("CATEGORY", 200);
            myListView.MultiSelect = false;
            myListView.ItemSelectionChanged += myListView_ItemSelectionChanged;
        }

        static void myListView_ItemSelectionChanged(object sender, ListViewItemSelectionChangedEventArgs e)
        {
            if (e.IsSelected)
            {
                ListViewItem listViewItem = e.Item;
                MessageBox.Show(listViewItem.SubItems[0].Text);
            }
        }

        private static void populateData()
        {
            Hashtable nebulae = new Hashtable
            {
                { "Horse Head","HII REGION"},
                {"Black Widow","REFLECTION NEBULAR"},
                { "Ghost Head","HII REGION"},
                { "Witch Head" ,"PLANETARY NEBULAR"},
                { "Cat's Eye","DARK NEBULAR"},
                { "Elephant's Trunk","HII REGION"},
                { "Helix", "SUPERNOVA REMNANTS"},
                { "Rosette","REFLECTION NEBULAR"},
                { "Ant","PLANETARY NEBULAR"},
                { "Orion","HII REGION"},
                { "Eagle","REFLECTION NEBULAR"},
                { "Roesette","PLANETARY NEBULAR"},
                { "Bernad 68","SUPERNOVA REMNANTS"},
                { "Butterfly","DARK NEBULAR"},
                { "Snake","DARK NEBULAR"},
                { "Own","REFLECTION NEBULAR"},
                { "Ring", "SUPERNOVA REMNANTS"},
                { "Pelican","PLANETARY NEBULAR"},
                { "Cone","DARK NEBULAR"},
                { "Flame","REFLECTION NEBULAR"},
                { "Bumerang", "SUPERNOVA REMNANTS"}

            };
            int i = -1;
            String[] nebulaeCategories = new string[nebulae.Values.Count];
            foreach (string nebular in nebulae.Values)
            {
                //take note we pre-increment our variable. It will add first then return the value. So it will start at 0;
                nebulaeCategories[++i] = nebular;
            }

            int j = -1;
            foreach (string nebular in nebulae.Keys)
            {
                //take note we pre-increment our variable. It will add first then return the value. So it will start at 0;
                myListView.Items.Add(new ListViewItem(new[] { nebular, nebulaeCategories[++j] }));
            }
        }
    }
}

 

Best Regards,Oclemy.