LISTVIEWEX : TOUT SELECTIONNER , TOUT DESELECTIONNER

using System;
using System.ComponentModel;
using System.Collections;
using System.Diagnostics;
using System.Runtime.InteropServices;

namespace ListViewEx
{
	/// <summary>
	/// Description résumée de ListViewEx.
	/// </summary>
	public class ListViewEx : System.Windows.Forms.ListView 
	{
		[DllImport("user32.dll")]
		public static extern bool SendMessage(IntPtr hWnd, ListViewMessages msg,
			Int32 wParam, ref LV_ITEM lParam);
		

		#region LV_ITEM
		[StructLayoutAttribute(LayoutKind.Sequential)]
		public struct LV_ITEM
		{
			public ListViewItemFlags mask;
			public Int32 iItem;
			public Int32 iSubItem;
			//public ListViewItemStates state;
			public ListViewItemStates state;
			public ListViewItemStates stateMask;
			public String pszText;
			public Int32 cchTextMax;
			public Int32 iImage;
			public IntPtr lParam;
			public Int32 iIndent;
		}
		#endregion

		#region ListViewItem States / LVIS
		/// <summary>
		/// ListViewItemState / LVIS
		/// </summary>
		public enum ListViewItemStates : int
		{
			NOSTATE			   = 0x0000,
			FOCUSED            = 0x0001,
			SELECTED           = 0x0002,
			CUT                = 0x0004,
			DROPHILITED        = 0x0008,
			GLOW               = 0x0010,
			ACTIVATING         = 0x0020,
			OVERLAYMASK        = 0x0F00,
			STATEIMAGEMASK     = 0xF000,
		}
		#endregion
		#region LVM
		public enum ListViewMessages : int
		{
			FIRST				= 0x1000,
			SCROLL				= FIRST + 20,
			GETITEM				= FIRST + 75,
			SETITEM				= FIRST + 76,
			GETITEMTEXTW		= FIRST + 115,
			SETCOLUMNWIDTH		= FIRST + 30,
			LVSCW_AUTOSIZE			= -1,
			LVSCW_AUTOSIZE_USEHEADER= -2,
			SETITEMSTATE		= FIRST + 43,
			INSERTITEMA			= FIRST + 77,
			DELETEITEM			= FIRST + 8,
			GETITEMCOUNT		= FIRST + 4,
			GETCOUNTPERPAGE		= FIRST + 40,
			GETSUBITEMRECT		= FIRST + 56,
			SUBITEMHITTEST		= FIRST + 57,
			GETCOLUMN			= FIRST + 25,
			SETCOLUMN			= FIRST + 26,
			GETCOLUMNORDERARRAY	= FIRST + 59,
			SETCOLUMNORDERARRAY	= FIRST + 58,
			SETEXTENDEDLISTVIEWSTYLE= FIRST + 54,
			GETEXTENDEDLISTVIEWSTYLE= FIRST + 55,
			EDITLABELW			= FIRST + 118,
			GETITEMRECT        = FIRST + 14,
			HITTEST            = FIRST + 18,
			GETEDITCONTROL     = FIRST + 24,
			CANCELEDITLABEL	   = FIRST + 179,
			GETHEADER          = FIRST + 31,
			REDRAWITEMS        = FIRST + 21,
			GETSELECTIONMARK   = FIRST + 66,
			SETSELECTIONMARK   = FIRST + 67,
			ENSUREVISIBLE       = (FIRST + 19),
		}
		#endregion LVM
		#region ListViewItem Flags / LVIF
		/// <summary>
		/// ListViewItem Flags / LVIF
		/// </summary>
		public enum ListViewItemFlags : int
		{
			TEXT               = 0x0001,
			IMAGE              = 0x0002,
			PARAM              = 0x0004,
			STATE              = 0x0008,
			INDENT             = 0x0010,
			NORECOMPUTE        = 0x0800,
			GROUPID            = 0x0100,
			COLUMNS            = 0x0200,
		}
		#endregion
		private System.ComponentModel.Container components = null;

		public ListViewEx(System.ComponentModel.IContainer container)
		{
			container.Add(this);
			InitializeComponent();
		}

		public ListViewEx()
		{
			InitializeComponent();
			this.FullRowSelect = true;
		}

			protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if(components != null)
				{
					components.Dispose();
				}
			}
			base.Dispose( disposing );
		}


		#region Code généré par le Concepteur de composants
		/// <summary>
		/// Méthode requise pour la prise en charge du concepteur - ne modifiez pas
		/// le contenu de cette méthode avec l'éditeur de code.
		/// </summary>
		private void InitializeComponent()
		{
			components = new System.ComponentModel.Container();
		}
		#endregion

		public void SelectAll ()
		{
			LV_ITEM lv = new LV_ITEM();
			lv.mask = ListViewItemFlags.STATE;
			lv.state = ListViewItemStates.SELECTED ;
			lv.stateMask = ListViewItemStates.SELECTED;
			SendMessage(this.Handle,ListViewMessages.SETITEMSTATE,-1,ref lv);
		}

		public void UnselectAll()
		{
			LV_ITEM lv = new LV_ITEM();
			lv.state = ListViewItemStates.NOSTATE;
			lv.mask = ListViewItemFlags.STATE ;
			lv.stateMask = ListViewItemStates.SELECTED;
			SendMessage(this.Handle,ListViewMessages.SETITEMSTATE, -1, ref lv);
		}

	}
}