基于ArcGIS Engine的TOCControl右键菜单的两种实现方法

      基于Arcgis Engine的二次开发，TOCControl和MapControl的右键菜单比较常用，本篇博客仅讲述一下TOCControl的右键菜单的两种实现方法，MapControl的右键菜单类似。

方法一：使用contextMenuStrip实现，可在TOCControl的OnMouseDown事件中填写

    if(e.button!=2) return;
     esriTOCControlItem pItem = esriTOCControlItem.esriTOCControlItemNone;
     IBasicMap pMap = null;
     ILayer pLayer = null;
     IFeatureLayer pTocFeatureLayer = null;
     object unk = null;
     object data = null;
     axTOCControl1.HitTest(e.x, e.y, ref pItem, ref pMap, ref pLayer, ref unk, ref data);
     pTocFeatureLayer = pLayer as IFeatureLayer;
     if (pItem == esriTOCControlItem.esriTOCControlItemLayer && pTocFeatureLayer != null)
     {
           contextMenuStrip1.Show(Control.MousePosition);
     }

方法二：使用ToolbarMenu实现，可在TOCControl的OnMouseDown事件中填写

if (e.button == 2)              
{
   esr