SelectByShape 工具的实现

 public sealed class SelectByShapeTool : BaseTool
    {
        #region COM Registration Function(s)
        [ComRegisterFunction()]
        [ComVisible(false)]
        static void RegisterFunction(Type registerType)
        {
            // Required for ArcGIS Component Category Registrar support
            ArcGISCategoryRegistration(registerType);

            //
            // TODO: Add any COM registration code here
            //
        }

        [ComUnregisterFunction()]
        [ComVisible(false)]
        static void UnregisterFunction(Type registerType)
        {
            // Required for ArcGIS Component Category Registrar support
            ArcGISCategoryUnregistration(registerType);

            //
            // TODO: Add any COM unregistration code here
            //
        }

        #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);
            ControlsCommands.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);
            ControlsCommands.Unregister(regKey);

        }

        #endregion
        #endregion

        private IHookHelper m_hookHelper;
        private INewEnvelopeFeedback m_Feedback;
        private IPoint m_point;
        private bool isMouseDown = false;
        IMap pMap;

        public SelectByShapeTool()
        {
            //
            // TODO: Define values for the public properties
            //
            base.m_category = "CustomTool"; //localizable text 
            base.m_caption = "拉框选择";  //localizable text 
            base.m_message = "拉框选择";  //localizable text
            base.m_toolTip = "拉框选择";  //localizable text
            base.m_name = "SelectByShape";   //unique id, non-localizable (e.g. "MyCategory_MyTool")
            try
            {
                //
                // TODO: change resource name if necessary
                //
                string bitmapResourceName = GetType().Name + ".bmp";
                base.m_bitmap = new Bitmap(GetType(), bitmapResourceName);
                base.m_cursor = new System.Windows.Forms.Cursor(GetType(), GetType().Name + ".cur");
            }
            catch (Exception ex)
            {
                System.Diagnostics.Trace.WriteLine(ex.Message, "Invalid Bitmap");
            }
        }

        #region Overridden Class Methods

        /// <summary>
        /// Occurs when this tool is created
        /// </summary>
        /// <param name="hook">Instance of the application</param>
        public override void OnCreate(object hook)
        {
            if (m_hookHelper == null)
                m_hookHelper = new HookHelperClass();

            m_hookHelper.Hook = hook;
            // TODO:  Add SelectByShapeTool.OnCreate implementation
        }

        /// <summary>
        /// Occurs when this tool is clicked
        /// </summary>
        public override void OnClick()
        {
            // TODO: Add SelectByShapeTool.OnClick implementation
        }

        public override void OnMouseDown(int Button, int Shift, int X, int Y)
        {
            if (m_hookHelper.ActiveView == null) return;
            //如果是视图
            if (m_hookHelper.ActiveView is IActiveView)
            {
                IPoint pPoint = m_hookHelper.ActiveView.ScreenDisplay.
                    DisplayTransformation.ToMapPoint(X, Y) as IPoint;
                pMap = m_hookHelper.ActiveView.HitTestMap(pPoint);
                if (pMap != m_hookHelper.FocusMap)
                {
                    m_hookHelper.ActiveView.FocusMap = pMap;
                    m_hookHelper.ActiveView.PartialRefresh(esriViewDrawPhase.
                        esriViewGraphics, null, null);
                }
            }
            //在焦点地图上创建一个点
            IActiveView pac = m_hookHelper.FocusMap as IActiveView;
            m_point = pac.ScreenDisplay.DisplayTransformation.ToMapPoint(X, Y) as IPoint;
            isMouseDown = true;
        }

        public override void OnMouseMove(int Button, int Shift, int X, int Y)
        {
            if (!isMouseDown) return;
            //得到焦点图
            IActiveView pac = m_hookHelper.FocusMap as IActiveView;
            //初始化一个范围
            if (m_Feedback == null)
            {
                m_Feedback = new NewEnvelopeFeedbackClass();
                m_Feedback.Display = pac.ScreenDisplay;
                m_Feedback.Start(m_point);
            }
            //设置鼠标样式

            //画范围
            m_Feedback.MoveTo(pac.ScreenDisplay.DisplayTransformation.ToMapPoint(X, Y));
        }

        public override void OnMouseUp(int Button, int Shift, int X, int Y)
        {
            //设置鼠标样式

            if (!isMouseDown) return;
            //IEnvelope pEnv;
            IEnvelope pFeedEnv;
            IGeometry pGeo;  //查询用到图形，可能为点或者矩形
            //得到焦点地图
            IActiveView Pac = m_hookHelper.FocusMap as IActiveView;
            //如果不画范围
            if (m_Feedback == null)
            {
                return;
            }
            else
            {
                //停止画框
                pFeedEnv = m_Feedback.Stop();
                pGeo = pFeedEnv as IGeometry;
            }

            ISelectionEnvironment pSelectEnv = new SelectionEnvironmentClass();
            //改变默认选择集的颜色
            pSelectEnv.DefaultColor = MySymbology.GetRgbColor(110, 120, 210, 200);
            //选择要素，把它放入选择集中
            pMap = m_hookHelper.FocusMap;
            pMap.SelectByShape(pGeo, pSelectEnv, false);
            Pac.PartialRefresh(esriViewDrawPhase.esriViewGeoSelection, null, null);

            isMouseDown = false;
            m_Feedback = null;
            m_point = null;
        }
        #endregion
    }

参考资料：《ArcGIS  Engine组件式开发及应用》 科学出版社