C#如何实现选中控件出现虚线框

[littlyfx]

如题，我想要的效果是选中窗体中的某个控件（比如按钮）就在其周围产生虚线框

[drls1982]

ControlPaint.DrawReversibleFrame(new Rectangle(),Color.Red,FrameStyle.Dashed)出现边框,原处再画一次边框消失,根据拖动控件的位置,设置mousemove动态画边框就能实现了

[littlyfx]

马上去尝试，不过先谢谢拉

[littlyfx]

可以实现，实在是太感谢拉~

[nvip]

[UIPermission(SecurityAction.LinkDemand, Window=UIPermissionWindow.AllWindows)]
public static void DrawReversibleFrame(Rectangle rectangle, Color backColor, FrameStyle style)
{
int num;
Color white;
IntPtr ptr2;
if (backColor.GetBrightness() < 0.5)
{
num = 10;
white = Color.White;
}
else
{
num = 7;
white = Color.Black;
}
IntPtr handle = System.Windows.Forms.UnsafeNativeMethods.GetDCEx(new HandleRef(null, System.Windows.Forms.UnsafeNativeMethods.GetDesktopWindow()), System.Windows.Forms.NativeMethods.NullHandleRef, 0x403);
switch (style)
{
case FrameStyle.Dashed:
ptr2 = System.Windows.Forms.SafeNativeMethods.CreatePen(2, 1, ColorTranslator.ToWin32(backColor));
break;

default:
ptr2 = System.Windows.Forms.SafeNativeMethods.CreatePen(0, 2, ColorTranslator.ToWin32(backColor));
break;
}
int nDrawMode = System.Windows.Forms.SafeNativeMethods.SetROP2(new HandleRef(null, handle), num);
IntPtr ptr3 = System.Windows.Forms.SafeNativeMethods.SelectObject(new HandleRef(null, handle), new HandleRef(null, System.Windows.Forms.UnsafeNativeMethods.GetStockObject(5)));
IntPtr ptr4 = System.Windows.Forms.SafeNativeMethods.SelectObject(new HandleRef(null, handle), new HandleRef(null, ptr2));
System.Windows.Forms.SafeNativeMethods.SetBkColor(new HandleRef(null, handle), ColorTranslator.ToWin32(white));
System.Windows.Forms.SafeNativeMethods.Rectangle(new HandleRef(null, handle), rectangle.X, rectangle.Y, rectangle.Right, rectangle.Bottom);
System.Windows.Forms.SafeNativeMethods.SetROP2(new HandleRef(null, handle), nDrawMode);
System.Windows.Forms.SafeNativeMethods.SelectObject(new HandleRef(null, handle), new HandleRef(null, ptr3));
System.Windows.Forms.SafeNativeMethods.SelectObject(new HandleRef(null, handle), new HandleRef(null, ptr4));
if (ptr2 != IntPtr.Zero)
{
System.Windows.Forms.SafeNativeMethods.DeleteObject(new HandleRef(null, ptr2));
}
System.Windows.Forms.UnsafeNativeMethods.ReleaseDC(System.Windows.Forms.NativeMethods.NullHandleRef, new HandleRef(null, handle));
}