基本思路如下：利用鼠标左键将需要调整顺序的图层移动至目标位置。

①需要涉及到TOCControl的OnMouseDown事件来获取要调整的图层，

②OnMouseUp事件获得目标图层和索引号，

③再利用IMap提供的MoveLayer方法，将相应调整axMapControl中的图层的显示顺序。

④最后使用TOCControl的Update方法来更新TOCControl控件中的显示顺序；

//全局变量        public ITOCControl mTOCControl;        public ILayer pMoveLayer;//需要被调整的图层；        public int toIndex;//将要调整到的目标图层的索引； //窗体加载 private void Form1_Load(object sender, EventArgs e)        {                      this.axTOCControl1.SetBuddyControl(this.axMapControl1);           mTOCControl=this.axTOCControl1.Object as ITOCControl;        }   //TOCControl控件的OnMouseDown事件，获得需要被调整的图层  private void axTOCControl1_OnMouseDown(object sender, ITOCControlEvents_OnMouseDownEvent e)        {            esriTOCControlItem item=esriTOCControlItem.esriTOCControlItemNone;            if (e.button == 1)            {                IBasicMap map = null;                ILayer layer = null;                object other = null;                object index = null;                 mTOCControl.HitTest(e.x, e.y, ref item, ref map, ref layer, ref other, ref index);                if (item == esriTOCControlItem.esriTOCControlItemLayer)                {                    if(layer is IAnnotationSublayer)                    {                        return;                    }                    else                    {                        pMoveLayer = layer;                    }                }                            }        } //TOCControl控件的OnMouseUp事件，获得目标图层及索引 //并实现axMapControl中视图显示的索引的变化，并更新TOCControl控件中的显示顺序 private void axTOCControl1_OnMouseUp(object sender, ITOCControlEvents_OnMouseUpEvent e)        {            if (e.button == 1)            {                esriTOCControlItem item = esriTOCControlItem.esriTOCControlItemNone;                IBasicMap map = null;                ILayer layer = null;                object other = null;                object index = null;                 mTOCControl.HitTest(e.x, e.y, ref item, ref map, ref layer, ref other, ref index);                IMap pMap = this.axMapControl1.ActiveView.FocusMap;                if(item==esriTOCControlItem.esriTOCControlItemLayer||layer!=null)                {                    if (pMoveLayer != null)                    {                        ILayer pTempLayer;                        for (int i = 0; i < pMap.LayerCount; i++)                        {                            pTempLayer = pMap.get_Layer(i);                            if (pTempLayer == layer)                            {                                toIndex = i;                            }                        }                        pMap.MoveLayer(pMoveLayer,toIndex);                        axMapControl1.ActiveView.Refresh();                        mTOCControl.Update();                    }                }            }        }