About the Create a custom selection extension by extending ArcObjects Sample
[C#]
SelectionCountDockWin.cs
using System; using System.Collections.Generic; using System.ComponentModel; using System.Drawing; using System.Data; using System.Text; using System.Windows.Forms; using System.Runtime.InteropServices; using ESRI.ArcGIS.esriSystem; using ESRI.ArcGIS.SystemUI; using ESRI.ArcGIS.Framework; using ESRI.ArcGIS.ADF.CATIDs; namespace SelectionCOMSample { [Guid("3c20265d-1db1-4c94-b145-a2f6cdb504bf")] [ClassInterface(ClassInterfaceType.None)] [ProgId("SelectionCOMSample.SelectionCountDockWin")] public partial class SelectionCountDockWin : UserControl, IDockableWindowDef, IDockableWindowInitialPlacement, IDockableWindowImageDef { private IApplication m_application; private static System.Windows.Forms.ListView s_listView; #region COM Registration Function(s) [ComRegisterFunction()] [ComVisible(false)] static void RegisterFunction(Type registerType) { // Required for ArcGIS Component Category Registrar support ArcGISCategoryRegistration(registerType); } [ComUnregisterFunction()] [ComVisible(false)] static void UnregisterFunction(Type registerType) { // Required for ArcGIS Component Category Registrar support ArcGISCategoryUnregistration(registerType); } #region ArcGIS Component Category Registrar generated code /// <summary> /// Required method for ArcGIS Component Category registration - /// Do not modify the contents of this method with the code editor. /// </summary> private static void ArcGISCategoryRegistration(Type registerType) { string regKey = string.Format("HKEY_CLASSES_ROOT\\CLSID\\{{{0}}}", registerType.GUID); MxDockableWindows.Register(regKey); } /// <summary> /// Required method for ArcGIS Component Category unregistration - /// Do not modify the contents of this method with the code editor. /// </summary> private static void ArcGISCategoryUnregistration(Type registerType) { string regKey = string.Format("HKEY_CLASSES_ROOT\\CLSID\\{{{0}}}", registerType.GUID); MxDockableWindows.Unregister(regKey); } #endregion #endregion public SelectionCountDockWin() { InitializeComponent(); s_listView = listView1; listView1.View = View.Details; } internal static void Clear() { if (s_listView != null) s_listView.Items.Clear(); } internal static void AddItem(string layerName, int selectionCount) { if (s_listView == null) return; ListViewItem item = new ListViewItem(layerName); item.SubItems.Add(selectionCount.ToString()); s_listView.Items.Add(item); } #region IDockableWindowDef Members string IDockableWindowDef.Caption { get { return "Selected Features Count"; } } int IDockableWindowDef.ChildHWND { get { return this.Handle.ToInt32(); } } string IDockableWindowDef.Name { get { return "ESRI_SelectionCOMSample_SelCountDockWin"; } } void IDockableWindowDef.OnCreate(object hook) { m_application = hook as IApplication; } void IDockableWindowDef.OnDestroy() { } object IDockableWindowDef.UserData { get { return null; } } #endregion #region IDockableWindowImageDef Members public int Bitmap { get { System.Drawing.Bitmap bitmap = new System.Drawing.Bitmap( GetType().Assembly.GetManifestResourceStream("SelectionCOMSample.Images.ToggleDockWinBtn.png")); bitmap.MakeTransparent(); return bitmap.GetHbitmap().ToInt32(); } } #endregion #region IDockableWindowInitialPlacement Members esriDockFlags IDockableWindowInitialPlacement.DockPosition { get { return esriDockFlags.esriDockRight | esriDockFlags.esriDockTabbed; } } int IDockableWindowInitialPlacement.Height { get { return 300; } } UID IDockableWindowInitialPlacement.Neighbor { get { UID uid = new UIDClass(); uid.Value = "esriArcMapUI.TOCDockableWindow"; //TOC return uid; } } int IDockableWindowInitialPlacement.Width { get { return 300; } } #endregion } }
[Visual Basic .NET]
SelectionCountDockWin.vb
Imports Microsoft.VisualBasic Imports System Imports System.Collections.Generic Imports System.ComponentModel Imports System.Drawing Imports System.Data Imports System.Text Imports System.Windows.Forms Imports System.Runtime.InteropServices Imports ESRI.ArcGIS.esriSystem Imports ESRI.ArcGIS.SystemUI Imports ESRI.ArcGIS.Framework Imports ESRI.ArcGIS.ADF.CATIDs Namespace SelectionCOMSample <Guid("3c20265d-1db1-4c94-b145-a2f6cdb504bf"), ClassInterface(ClassInterfaceType.None), ProgId("SelectionCOMSample.SelectionCountDockWin")> _ Partial Public Class SelectionCountDockWin Inherits UserControl Implements IDockableWindowDef, IDockableWindowInitialPlacement, IDockableWindowImageDef Private m_application As IApplication Private Shared s_listView As System.Windows.Forms.ListView #Region "COM Registration Function(s)" <ComRegisterFunction(), ComVisible(False)> _ Private Shared Sub RegisterFunction(ByVal registerType As Type) ' Required for ArcGIS Component Category Registrar support ArcGISCategoryRegistration(registerType) End Sub <ComUnregisterFunction(), ComVisible(False)> _ Private Shared Sub UnregisterFunction(ByVal registerType As Type) ' Required for ArcGIS Component Category Registrar support ArcGISCategoryUnregistration(registerType) End Sub #Region "ArcGIS Component Category Registrar generated code" ''' <summary> ''' Required method for ArcGIS Component Category registration - ''' Do not modify the contents of this method with the code editor. ''' </summary> Private Shared Sub ArcGISCategoryRegistration(ByVal registerType As Type) Dim regKey As String = String.Format("HKEY_CLASSES_ROOT\CLSID\{{{0}}}", registerType.GUID) MxDockableWindows.Register(regKey) End Sub ''' <summary> ''' Required method for ArcGIS Component Category unregistration - ''' Do not modify the contents of this method with the code editor. ''' </summary> Private Shared Sub ArcGISCategoryUnregistration(ByVal registerType As Type) Dim regKey As String = String.Format("HKEY_CLASSES_ROOT\CLSID\{{{0}}}", registerType.GUID) MxDockableWindows.Unregister(regKey) End Sub #End Region #End Region Public Sub New() InitializeComponent() s_listView = listView1 listView1.View = View.Details End Sub Friend Shared Sub Clear() If s_listView IsNot Nothing Then s_listView.Items.Clear() End If End Sub Friend Shared Sub AddItem(ByVal layerName As String, ByVal selectionCount As Integer) If s_listView Is Nothing Then Return End If Dim item As New ListViewItem(layerName) item.SubItems.Add(selectionCount.ToString()) s_listView.Items.Add(item) End Sub #Region "IDockableWindowDef Members" Private ReadOnly Property Caption() As String Implements IDockableWindowDef.Caption Get Return "Selected Features Count" End Get End Property Private ReadOnly Property ChildHWND() As Integer Implements IDockableWindowDef.ChildHWND Get Return Me.Handle.ToInt32() End Get End Property Private ReadOnly Property Name() As String Implements IDockableWindowDef.Name Get Return "ESRI_SelectionCOMSample_SelCountDockWin" End Get End Property Private Sub OnCreate(ByVal hook As Object) Implements IDockableWindowDef.OnCreate m_application = TryCast(hook, IApplication) End Sub Private Sub OnDestroy() Implements IDockableWindowDef.OnDestroy End Sub Private ReadOnly Property UserData() As Object Implements IDockableWindowDef.UserData Get Return Nothing End Get End Property #End Region #Region "IDockableWindowImageDef Members" Public ReadOnly Property Bitmap() As Integer Implements ESRI.ArcGIS.Framework.IDockableWindowImageDef.Bitmap Get Dim image As New System.Drawing.Bitmap(Me.GetType().Assembly.GetManifestResourceStream("ToggleDockWinBtn.png")) image.MakeTransparent() Return image.GetHbitmap().ToInt32() End Get End Property #End Region #Region "IDockableWindowInitialPlacement Members" Private ReadOnly Property DockPosition() As esriDockFlags Implements IDockableWindowInitialPlacement.DockPosition Get Return esriDockFlags.esriDockRight Or esriDockFlags.esriDockTabbed End Get End Property Private ReadOnly Property Height() As Integer Implements IDockableWindowInitialPlacement.Height Get Return 300 End Get End Property Private ReadOnly Property Neighbor() As UID Implements IDockableWindowInitialPlacement.Neighbor Get Dim uid As UID = New UIDClass() uid.Value = "esriArcMapUI.TOCDockableWindow" 'TOC Return uid End Get End Property Private ReadOnly Property Width() As Integer Implements IDockableWindowInitialPlacement.Width Get Return 300 End Get End Property #End Region End Class End Namespace