Column Sorting 이 있는 ListView

프로그램 설명

ListView 은 sorting 기능을 items 에서 지원하므로, 수작업으로 sub-items 까지 sorting 하는 기능을 작성해야 합니다. 그래서 필수적인 IComparer 인터페이스를 이용해서 구현합니다. 

예제에 있는 sorting 타입은 3가지 타입으로 숫자, 날짜, 문자열로 나뉘어 구분합니다.

실행 후

프로그램 작성 순서

1. IComparer 에서 상속받은 ListViewComparer class

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using System.Windows.Forms;

namespace SortListViewColumn.lib
{
    // Compares two ListView items based on a selected column.
    public class ListViewComparer : System.Collections.IComparer
    {
        private int ColumnNumber;
        private SortOrder SortOrder;

        public ListViewComparer(int column_number, SortOrder sort_order)
        {
            ColumnNumber = column_number;
            SortOrder = sort_order;
        }

        // Compare two ListViewItems.
        public int Compare(object object_x, object object_y)
        {
            // Get the objects as ListViewItems.
            ListViewItem item_x = object_x as ListViewItem;
            ListViewItem item_y = object_y as ListViewItem;

            // Get the corresponding sub-item values.
            string string_x;
            if (item_x.SubItems.Count <= ColumnNumber)
            {
                string_x = "";
            }
            else
            {
                string_x = item_x.SubItems[ColumnNumber].Text;
            }

            string string_y;
            if (item_y.SubItems.Count <= ColumnNumber)
            {
                string_y = "";
            }
            else
            {
                string_y = item_y.SubItems[ColumnNumber].Text;
            }

            // Compare them.
            int result;
            double double_x, double_y;
            if (double.TryParse(string_x, out double_x) &&
                double.TryParse(string_y, out double_y))
            {
                // Treat as a number.
                result = double_x.CompareTo(double_y);
            }
            else
            {
                DateTime date_x, date_y;
                if (DateTime.TryParse(string_x, out date_x) &&
                    DateTime.TryParse(string_y, out date_y))
                {
                    // Treat as a date.
                    result = date_x.CompareTo(date_y);
                }
                else
                {
                    // Treat as a string.
                    result = string_x.CompareTo(string_y);
                }
            }

            // Return the correct result depending on whether
            // we're sorting ascending or descending.
            if (SortOrder == SortOrder.Ascending)
            {
                return result;
            }
            else
            {
                return -result;
            }
        }
    }
}

2. ColumnClick 이벤트 method

        private void listView1_ColumnClick(object sender, ColumnClickEventArgs e)
        {
            // Get the new sorting column.
            ColumnHeader new_sorting_column = listView1.Columns[e.Column];

            // Figure out the new sorting order.
            System.Windows.Forms.SortOrder sort_order;
            if (SortingColumn == null)
            {
                // New column. Sort ascending.
                sort_order = SortOrder.Ascending;
            }
            else
            {
                // See if this is the same column.
                if (new_sorting_column == SortingColumn)
                {
                    // Same column. Switch the sort order.
                    if (SortingColumn.Text.StartsWith("> "))
                    {
                        sort_order = SortOrder.Descending;
                    }
                    else
                    {
                        sort_order = SortOrder.Ascending;
                    }
                }
                else
                {
                    // New column. Sort ascending.
                    sort_order = SortOrder.Ascending;
                }

                // Remove the old sort indicator.
                SortingColumn.Text = SortingColumn.Text.Substring(2);
            }

            // Display the new sort order.
            SortingColumn = new_sorting_column;
            if (sort_order == SortOrder.Ascending)
            {
                SortingColumn.Text = "> " + SortingColumn.Text;
            }
            else
            {
                SortingColumn.Text = "< " + SortingColumn.Text;
            }

            // Create a comparer.
            listView1.ListViewItemSorter = new ListViewComparer(e.Column, sort_order);

            // Sort.
            listView1.Sort();

            // Display order column and sorting type
            toolStripStatusLabel1.Text = "Sorting : " + SortingColumn.Text;
        }

소스 파일 : 

ListViewExample2.zip