TOCControl右键菜单

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两种方式：（一种是原模式，一种是装饰模式）

1、原模式

private ITOCControl2 m_tocControl;
private IMapControl3 m_mapControl;
private IToolbarMenu m_menuMap;
private IToolbarMenu m_menuLayer;

m_tocControl = (ITOCControl2)axTOCControl1.Object;
m_mapControl = (IMapControl3)axMapControl1.Object;

//Add custom commands to the map menu
m_menuMap = new ToolbarMenuClass();
m_menuMap.AddItem(new LayerVisibility(), 1, 0, false, esriCommandStyles.esriCommandStyleTextOnly);//添加
m_menuMap.AddItem(new LayerVisibility(), 2, 1, false, esriCommandStyles.esriCommandStyleTextOnly);
//Add pre-defined menu to the map menu as a sub menu
m_menuMap.AddSubMenu("esriControls.ControlsFeatureSelectionMenu", 2, true);
//Add custom commands to the map menu
m_menuLayer = new ToolbarMenuClass();
m_menuLayer.AddItem(new RemoveLayer(), -1, 0, false, esriCommandStyles.esriCommandStyleTextOnly);
m_menuLayer.AddItem(new ScaleThresholds(), 1, 1, true, esriCommandStyles.esriCommandStyleTextOnly);
m_menuLayer.AddItem(new ScaleThresholds(), 2, 2, false, esriCommandStyles.esriCommandStyleTextOnly);
m_menuLayer.AddItem(new ScaleThresholds(), 3, 3, false, esriCommandStyles.esriCommandStyleTextOnly);
m_menuLayer.AddItem(new LayerSelectable(), 1, 4, true, esriCommandStyles.esriCommandStyleTextOnly);
m_menuLayer.AddItem(new LayerSelectable(), 2, 5, false, esriCommandStyles.esriCommandStyleTextOnly);
m_menuLayer.AddItem(new ZoomToLayer(), -1, 6, true, esriCommandStyles.esriCommandStyleTextOnly);

//Set the hook of each menu
m_menuLayer.SetHook(m_mapControl);
m_menuMap.SetHook(m_mapControl);

private void axTOCControl1_OnMouseDown(object sender, ITOCControlEvents_OnMouseDownEvent e)
{
if (e.button != 2) return;

esriTOCControlItem item = esriTOCControlItem.esriTOCControlItemNone;//选择item的类型，有Map，Layer，Legend
IBasicMap map = null; ILayer layer = null;
object other = null; object index = null;

//Determine what kind of item is selected
m_tocControl.HitTest(e.x, e.y, ref item, ref map, ref layer, ref other, ref index);

//Ensure the item gets selected
if (item == esriTOCControlItem.esriTOCControlItemMap)
m_tocControl.SelectItem(map, null);//设置SelectItem，通过GetSelectItem获取。
else
m_tocControl.SelectItem(layer, null);

//Set the layer into the CustomProperty (this is used by the custom layer commands)
m_mapControl.CustomProperty = layer;//设置CustomProperty属性，这个属性在ICommand接口的Hook中获取，进行对该Layer操作。

//Popup the correct context menu
if (item == esriTOCControlItem.esriTOCControlItemMap) m_menuMap.PopupMenu(e.x, e.y, m_tocControl.hWnd);
if (item == esriTOCControlItem.esriTOCControlItemLayer) m_menuLayer.PopupMenu(e.x, e.y, m_tocControl.hWnd);
}

2、装饰模式

在项目中添加新项【Arcgis】-【Context Menu（AE）】，用此模板完成。

EngineContextMenu1 menucontext = new EngineContextMenu1();
menucontext.SetHook(axMapControl1.Object);

menucontext.PopupMenu(e.x, e.y, m_tocControl.hWnd);

EngineContextMenu1 类有SetHook（），PopupMenu（）和IToolbarMenu2 ContextMenu属性。

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