C# ListView 支持分组时拖拉排序的控件

usingSystem;usingSystem.Drawing;usingSystem.Windows.Forms;usingSystem.Collections.Generic;namespaceWindowsFormsApplication1{classDragItemListView:ListView{publicDragItemListView(){SetStyle(ControlStyles.DoubleBuffer|ControlStyles.OptimizedDoubleBuffer|ControlStyles.AllPainti