listView 中，大图标时，各个图标之间间距的控制

[DllImport("user32.dll",CharSet = CharSet.Auto)]
public   static   extern   IntPtr   SendMessage(IntPtr   hWnd,   int   msg,   int   wParam,   int   lParam); 
private   int   LVM_SETICONSPACING   =   0x1035; 
//把下面放到相应 form 的 form_Load 或者是 构造函数中,
SendMessage(this.listViewChart.Handle,   LVM_SETICONSPACING,   0,   0x10000   *   140   +   130