using System.Runtime.InteropServices;

 

private const int WS_HSCROLL = 0x100000;private const int WS_VSCROLL = 0x200000;private const int GWL_STYLE = (-16);  [DllImport("user32.dll")] private static extern int GetWindowLong(IntPtr hwnd, int nIndex);

 

/// 
        /// 判断是否出现垂直滚动条        /// 
        /// 待测控件        /// 
     
      出现垂直滚动条返回true，否则为false
             public static bool IsVerticalScrollBarVisible(Control ctrl)        {            if (!ctrl.IsHandleCreated)                return false;            return (GetWindowLong(ctrl.Handle, GWL_STYLE) & WS_VSCROLL) != 0;        }

 

 

/// 
        /// 判断是否出现水平滚动条        /// 
        /// 待测控件        /// 
     
      出现水平滚动条返回true，否则为false
             public static bool IsHorizontalScrollBarVisible(Control ctrl)        {            if (!ctrl.IsHandleCreated)                return false;            return (GetWindowLong(ctrl.Handle, GWL_STYLE) & WS_HSCROLL) != 0;        }

 

 

 

ShowScrollBar Function

/*

* Scroll Bar Constants

*/

#define SB_HORZ             0

#define SB_VERT             1

#define SB_CTL              2

#define SB_BOTH             3

/*

隐藏和显示滚动条

[DllImport("user32.dll")]public static extern bool ShowScrollBar(IntPtr hWnd, int wBar, bool bShow);

 

 

/** Scroll Bar Constants*/        public const int SB_HORZ = 0;        public const int SB_VERT = 1;        public const int SB_CTL = 2;        public const int SB_BOTH = 3;        /*        * ShowWindow() Commands        */        public const int SW_HIDE = 0;        public const int SW_SHOW = 5;

private void button1_Click(object sender, EventArgs e)        {            ShowScrollBar(listView1.Handle,SB_VERT , false);           }