C# -- ListView 컬럼 제목 click 시 정렬하기 ; 내림차순, 오름차순

C# -- ListView 컬럼 제목 click 시 정렬하기 ; 내림차순, 오름차순

참고 : https://msdn.microsoft.com/en-us/library/ms996467.aspx

       https://msdn.microsoft.com/en-us/library/system.windows.forms.listview.columnheadercollection(v=vs.110).aspx

       https://msdn.microsoft.com/ko-kr/library/system.collections.icomparer(v=vs.110).aspx

       https://www.youtube.com/watch?v=kWVgcQk7VIo

	using System;
	using System.Collections;
	using System.Collections.Generic;
	using System.ComponentModel;
	using System.Data;
	using System.Drawing;
	using System.Text;
	using System.Threading.Tasks;
	using System.Windows.Forms;
	namespace ListView_sort2
	{
	public partial class Form1 : Form
	{
	private int sortColumn = -1;
	private String[] listview_columnTitle = { "aa", "bb", "cc" };
	public Form1()
	{
	InitializeComponent();
	}
	private void Form1_Load(object sender, EventArgs e)
	{
	start_ListView();
	add_items();
	}
	private void start_ListView()
	{
	// throw new NotImplementedException();
	listView1.View = View.Details;
	listView1.GridLines = true;
	listView1.FullRowSelect = true;
	int listview_width = listView1.ClientSize.Width;
	int col_width = listview_width / 3;
	listView1.Columns.Add(listview_columnTitle[0], col_width, HorizontalAlignment.Center);
	listView1.Columns.Add(listview_columnTitle[1], col_width, HorizontalAlignment.Center);
	listView1.Columns.Add(listview_columnTitle[2], col_width, HorizontalAlignment.Center);
	}
	private void add_items()
	{
	ListViewItem newitem = new ListViewItem(new String[] { "c1", "5", "2" });
	listView1.Items.Add(newitem);
	ListViewItem newitem2 = new ListViewItem(new String[] { "b1", "4", "3" });
	listView1.Items.Add(newitem2);
	ListViewItem newitem3 = new ListViewItem(new String[] { "c2", "3", "4" });
	listView1.Items.Add(newitem3);
	ListViewItem newitem4 = new ListViewItem(new String[] { "e1", "0", "5" });
	listView1.Items.Add(newitem4);
	ListViewItem newitem5 = new ListViewItem(new String[] { "d1", "1", "1" });
	listView1.Items.Add(newitem5);
	}
	private void listView1_ColumnClick(object sender, ColumnClickEventArgs e)
	{
	// Determine whether the column is the same as the last column clicked.
	if (e.Column != sortColumn)
	{
	// Set the sort column to the new column.
	sortColumn = e.Column;
	// Set the sort order to ascending by default.
	listView1.Sorting = SortOrder.Ascending;
	listView1.Columns[sortColumn].Text = listview_columnTitle[sortColumn] + " ▲";
	}
	else
	{
	// Determine what the last sort order was and change it.
	if (listView1.Sorting == SortOrder.Ascending)
	{
	listView1.Sorting = SortOrder.Descending;
	listView1.Columns[sortColumn].Text = listview_columnTitle[sortColumn] + " ▼";
	}
	else
	{
	listView1.Sorting = SortOrder.Ascending;
	listView1.Columns[sortColumn].Text = listview_columnTitle[sortColumn] + " ▲";
	}
	}
	// Call the sort method to manually sort.
	listView1.Sort();
	// Set the ListViewItemSorter property to a new ListViewItemComparer
	// object.
	this.listView1.ListViewItemSorter = new MyListViewComparer(e.Column, listView1.Sorting);
	}
	}
	class MyListViewComparer : IComparer
	{
	private int col;
	private SortOrder order;
	public MyListViewComparer() {
	col=0;
	order = SortOrder.Ascending;
	}
	public MyListViewComparer(int column, SortOrder order)
	{
	col=column;
	this.order = order;
	}
	public int Compare(object x, object y)
	{
	int returnVal= -1;
	returnVal = String.Compare(((ListViewItem)x).SubItems[col].Text,
	((ListViewItem)y).SubItems[col].Text);
	// Determine whether the sort order is descending.
	if (order == SortOrder.Descending)
	// Invert the value returned by String.Compare.
	returnVal *= -1;
	return returnVal;
	}
	}
	}

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