/// <summary>
/// 使控件的特定区域无效并向控件发送绘制消息。还可以使分配给该控件的子控件无效。
/// </summary>
/// <param name="hWnd">控件句柄。</param>
/// <param name="invalidateChildren">若要使控件的子控件无效，则为 true；否则为 false。</param>
public static void Invalidate(IntPtr hWnd, bool invalidateChildren)
{
if (GetIsHandleCreated(hWnd))
{
if (invalidateChildren)
{
UnsafeNativeMethods.RedrawWindow(hWnd, IntPtr.Zero, IntPtr.Zero, NativeMethods.RDW_ALLCHILDREN | NativeMethods.RDW_INVALIDATE);//.Net Framework :多NativeMethods.RDW_ERASE
}
else
{
UnsafeNativeMethods.InvalidateRect(hWnd, IntPtr.Zero, false);//.Net Framework :支持透明为true,否则false
}
}
}
/// <summary>
/// 使控件的指定区域无效（将其添加到控件的更新区域，下次绘制操作时将重新绘制更新区域），并向控件发送绘制消息。还可以使分配给该控件的子控件无效。
/// </summary>
/// <param name="hWnd">控件句柄。</param>
/// <param name="rc">一个 System.Drawing.Rectangle，表示要使之无效的区域。</param>
/// <param name="invalidateChildren">若要使控件的子控件无效，则为 true；否则为 false。</param>
public static void Invalidate(IntPtr hWnd, Rectangle rc, bool invalidateChildren)
{
if (rc.IsEmpty)
{
Invalidate(hWnd, invalidateChildren);
}
else if (GetIsHandleCreated(hWnd))
{
if (invalidateChildren)
{
NativeMethods.RECT rcUpdate = NativeMethods.RECT.FromXYWH(rc.X, rc.Y, rc.Width, rc.Height);
UnsafeNativeMethods.RedrawWindow(hWnd, ref rcUpdate, IntPtr.Zero, NativeMethods.RDW_ALLCHILDREN | NativeMethods.RDW_INVALIDATE);//.Net Framework :多NativeMethods.RDW_ERASE
}
else
{
NativeMethods.RECT rect = NativeMethods.RECT.FromXYWH(rc.X, rc.Y, rc.Width, rc.Height);
UnsafeNativeMethods.InvalidateRect(hWnd, ref rect, false);//.Net Framework :支持透明为true,否则false
}
}
}