private void Form1_Load(object sender, EventArgs e)
        {
            m_menuMap   = new ToolbarMenuClass();
            m_menuLayer = new ToolbarMenuClass();

            //初始化指针
            m_mapControl        = (IMapControl3)this.axMapControl1.Object;
            m_pageLayoutControl = (IPageLayoutControl2)this.axPageLayoutControl1.Object;

            //初始化controls synchronization calss
            m_controlsSynchronizer = new
                                     ControlsSynchronizer(m_mapControl, m_pageLayoutControl);
            //把MapControl和PageLayoutControl绑定起来(两个都指向同一个Map),然后设置MapControl为活动的Control
            m_controlsSynchronizer.BindControls(true);
            //为了在切换MapControl和PageLayoutControl视图同步,要添加Framework Control
            m_controlsSynchronizer.AddFrameworkControl(axToolbarControl1.Object);
            m_controlsSynchronizer.AddFrameworkControl(this.axTOCControl1.Object);
            // 添加打开命令按钮到工具条
            OpenNewMapDocument openMapDoc = new OpenNewMapDocument(m_controlsSynchronizer);

            axToolbarControl1.AddItem(openMapDoc, -1, 0, false, -1, esriCommandStyles.esriCommandStyleIconOnly);

            sMapUnits = "Unknown";

            //添加自定义菜单项到TOCCOntrol的Map菜单中
            //打开文档菜单
            m_menuMap.AddItem(new OpenNewMapDocument(m_controlsSynchronizer), -1, 0, false, esriCommandStyles.esriCommandStyleIconAndText);
            //添加数据菜单
            m_menuMap.AddItem(new ControlsAddDataCommandClass(), -1, 1, false, esriCommandStyles.esriCommandStyleIconAndText);
            //打开全部图层菜单
            m_menuMap.AddItem(new LayerVisibility(), 1, 2, false, esriCommandStyles.esriCommandStyleTextOnly);
            //关闭全部图层菜单
            m_menuMap.AddItem(new LayerVisibility(), 2, 3, false, esriCommandStyles.esriCommandStyleTextOnly);
            //以二级菜单的形式添加内置的“选择”菜单
            m_menuMap.AddSubMenu("esriControls.ControlsFeatureSelectionMenu", 4, true);
            //以二级菜单的形式添加内置的“地图浏览”菜单
            m_menuMap.AddSubMenu("esriControls.ControlsMapViewMenu", 5, true);
            //添加自定义菜单项到TOCCOntrol的图层菜单中
            m_menuLayer = new ToolbarMenuClass();
            //添加“移除图层”菜单项
            m_menuLayer.AddItem(new RemoveLayer(), -1, 0, false, esriCommandStyles.esriCommandStyleTextOnly);
            //添加“放大到整个图层”菜单项
            m_menuLayer.AddItem(new ZoomToLayer(), -1, 1, true, esriCommandStyles.esriCommandStyleTextOnly);

            m_tocControl = (ITOCControl2)this.axTOCControl1.Object;

            //设置菜单的Hook
            m_menuLayer.SetHook(m_mapControl);
            m_menuMap.SetHook(m_mapControl);
        }
        //打开地图
        private void openToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (this.axMapControl1.LayerCount > 0)
            {
                DialogResult result = MessageBox.Show("是否保存当前地图?", "警告",
                                                      MessageBoxButtons.YesNoCancel, MessageBoxIcon.Question);
                if (result == DialogResult.Cancel)
                {
                    return;
                }
                if (result == DialogResult.Yes)
                {
                    this.saveToolStripMenuItem_Click(null, null);
                }
            }
            OpenNewMapDocument openMapDoc = new OpenNewMapDocument(m_controlsSynchronizer);

            openMapDoc.OnCreate(m_controlsSynchronizer.MapControl.Object);
            openMapDoc.OnClick();
        }