TOCControl图层顺序调整

    TOCControl本身没有实现此功能，需要开发人员编码实现，主要是利用HisTest()方法获取要移动的图层及图层索引：

     ①在OnMouseDown事件中获取需要移动的图层

     ②在OnMouseUp事件中，获取移动后的图层索引，利用IMap接口封装的MoveLayer()方法进行图层移动，完成后刷新TOCControl；

     代码实现如下：

        public ITOCControl mTOCControl;
        public ILayer pMoveLayer;
        public int toIndex;

        private void MainFrm_Load(object sender, EventArgs e)
        {

            mTOCControl = axTOCControl1.Object as ITOCControl; 
        }

       private void axTOCControl1_OnMouseDown(object sender, ITOCControlEvents_OnMouseDownEvent e)
       {
            esriTOCControlItem pItem = esriTOCControlItem.esriTOCControlItemNone;
            IBasicMap pBasMap = null;
            ILayer pLayer = null;
            object pOther = null;
            object pIndex = null;

            if (e.button == 1)
            {
                mTOCControl.HitTest(e.x, e.y, ref pItem, ref pBasMap, ref pLayer, ref pOther, ref pIndex);
                if (pItem == esriTOCControlItem.esriTOCControlItemLayer)
                {
                    if (pLayer is IAnnotationSublayer) return;//如果是注记图层则返回
                    else
                        pMoveLayer = pLayer;

                }
            }
       }

        private void axTOCControl1_OnMouseUp(object sender, ITOCControlEvents_OnMouseUpEvent e)
        {
            esriTOCControlItem pItem = esriTOCControlItem.esriTOCControlItemNone;
            IBasicMap pBasMap = null;
            ILayer pLayer = null;
            object pOther = null;
            object pIndex = null;

            if (e.button == 1)
            {
                mTOCControl.HitTest(e.x, e.y, ref pItem, ref pBasMap, ref pLayer, ref pOther, ref pIndex);
                if (pMoveLayer!=pLayer)//如果是原图层则不用操作
                {
                    IMap pMap = axMapControl1.Map;
                    ILayer pTempLayer;
                    for (int i = 0; i < pMap.LayerCount; i++)
                    {
                        pTempLayer = pMap.get_Layer(i);
                        if (pTempLayer == pLayer)//获取移动后的图层索引
                            toIndex = i;
                    }
                    pMap.MoveLayer(pMoveLayer, toIndex);
                    axMapControl1.ActiveView.Refresh();
                    mTOCControl.Update();
                }
            }
        }