ListView.Sorting : ListView « System.Windows.Forms « C# / C Sharp by API

1. C# / C Sharp by API
2. System.Windows.Forms
3. ListView

ListView.Sorting

 


using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.IO;

    public class Form1 : System.Windows.Forms.Form
    {
        private System.Windows.Forms.ListView listView1;
        private System.Windows.Forms.ColumnHeader lvcState;
        private System.Windows.Forms.ColumnHeader lvcCapital;

        public Form1()
        {
            InitializeComponent();
            listView1.Items.Add (new ListViewItem (new string[]{"a","d"}));
            listView1.Items.Add (new ListViewItem (new string[]{"b","c"}));
            listView1.Items.Add (new ListViewItem (new string[]{"c","b"}));
            listView1.Items.Add (new ListViewItem (new string[]{"d","a"}));
            
            listView1.View =  View.Details;
        }
        private void InitializeComponent()
        {
            this.listView1 = new System.Windows.Forms.ListView();
            this.lvcState = new System.Windows.Forms.ColumnHeader();
            this.lvcCapital = new System.Windows.Forms.ColumnHeader();
            this.SuspendLayout();

            this.listView1.Columns.AddRange(new System.Windows.Forms.ColumnHeader[] {
                                                                                        this.lvcState,
                                                                                        this.lvcCapital});
            this.listView1.FullRowSelect = true;
            this.listView1.Location = new System.Drawing.Point(0, 32);
            this.listView1.MultiSelect = false;
            this.listView1.Name = "listView1";
            this.listView1.Size = new System.Drawing.Size(292, 160);
            this.listView1.Sorting = System.Windows.Forms.SortOrder.Descending;
            this.listView1.TabIndex = 3;
            this.listView1.ColumnClick += new System.Windows.Forms.ColumnClickEventHandler(this.listView1_OnColumnClick);
            this.listView1.SelectedIndexChanged += new System.EventHandler(this.listView1_OnSelectedIndexChanged);
            // 
            // lvcState
            // 
            this.lvcState.Text = "State Name";
            this.lvcState.Width = 120;
            // 
            // lvcCapital
            // 
            this.lvcCapital.Text = "Capital City";
            this.lvcCapital.Width = 120;
            // 
            // Form1
            // 
            this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
            this.ClientSize = new System.Drawing.Size(292, 273);
            this.Controls.AddRange(new System.Windows.Forms.Control[] { this.listView1,
                                                                       });
            this.MinimumSize = new System.Drawing.Size(300, 300);
            this.Name = "Form1";
            this.Text = "The State Flags";
            this.ResumeLayout(false);

        }
        static void Main() 
        {
            Application.Run(new Form1());
        }

        private void listView1_OnColumnClick(object sender, System.Windows.Forms.ColumnClickEventArgs e)
        {
            ListViewSorter Sorter = new ListViewSorter();
            listView1.ListViewItemSorter = Sorter;
            if (!(listView1.ListViewItemSorter is ListViewSorter))
                return;
            Sorter = (ListViewSorter) listView1.ListViewItemSorter;

            if (Sorter.LastSort == e.Column)
            {
                if (listView1.Sorting == SortOrder.Ascending)
                    listView1.Sorting = SortOrder.Descending;
                else
                    listView1.Sorting = SortOrder.Ascending;
            }
            else{
                listView1.Sorting = SortOrder.Descending;
            }
            Sorter.ByColumn = e.Column;

            listView1.Sort ();
        }

        private void listView1_OnSelectedIndexChanged(object sender, System.EventArgs e)
        {
            if (listView1.SelectedItems.Count == 0)
            {
                return;
            }
            string State = listView1.SelectedItems[0].SubItems[0].Text;
            
            string Capital = listView1.SelectedItems[0].SubItems[1].Text;
            if (State.Length > 0)
            {
                Console.WriteLine(State + "   " + Capital);
            }
        }
    }
    
    public class ListViewSorter : System.Collections.IComparer
    {
        public int Compare (object o1, object o2)
        {
            if (!(o1 is ListViewItem))
                return (0);
            if (!(o2 is ListViewItem))
                return (0);

            ListViewItem lvi1 = (ListViewItem) o2;
            string str1 = lvi1.SubItems[ByColumn].Text;
            ListViewItem lvi2 = (ListViewItem) o1;
            string str2 = lvi2.SubItems[ByColumn].Text;

            int result;
            if (lvi1.ListView.Sorting == SortOrder.Ascending)
                result = String.Compare (str1, str2);
            else
                result = String.Compare (str2, str1);

            LastSort = ByColumn;

            return (result);
        }


        public int ByColumn
        {
            get {return Column;}
            set {Column = value;}
        }
        int Column = 0;

        public int LastSort
        {
            get {return LastColumn;}
            set {LastColumn = value;}
        }
        int LastColumn = 0;
    }   

           

   
  

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