获得TOCControl中的选中图层

问题： 

获得TOCControl中的选中图层，并对其判断如果是组图层则进行添加操作。

解决方法：

使用TOCControl.GetSelectedItem（）方法。

示例代码：

            esriTOCControlItem tocChoosedItem = esriTOCControlItem.esriTOCControlItemNone;
            IBasicMap pBasicMap = null;
            ILayer tocChoosedLyr = null;
            object pOther = new object();
            object pIndex = new object();
            m_Application.TOCControl.GetSelectedItem(ref tocChoosedItem, ref pBasicMap, ref tocChoosedLyr, ref pOther, ref  pIndex); 
           
            if (tocChoosedLyr is IGroupLayer)
            {
                ICompositeLayer compositeLyr = tocChoosedLyr as ICompositeLayer;
                int childLyrCount = compositeLyr.Count;
                for (int j = 0; j < childLyrCount; j++)
                {
                    ILayer childLyr = compositeLyr.get_Layer(j);
                    object[] objs = new object[] { childLyr.Name, true };
                    dataGridView1.Rows.Add(objs);
                }
            }