internal static extern IntPtr BeginPaint(IntPtr hWnd, ref PAINTSTRUCT ps);
internal static extern bool EndPaint(IntPtr hWnd, ref PAINTSTRUCT ps);
private void PerformWmPaint_WmPrintClient(ref Message m, bool isPaintMessage)
{
PAINTSTRUCT paintstruct1;
RECT rect1;
Rectangle rectangle1;
paintstruct1 = new PAINTSTRUCT();
IntPtr ptr1 = (isPaintMessage ? User32.BeginPaint(m.HWnd, ref paintstruct1) : m.WParam);
rect1 = new RECT();
User32.GetWindowRect(base.Handle, ref rect1);
rectangle1 = new Rectangle(0, 0, rect1.right - rect1.left, rect1.bottom - rect1.top);
using (Graphics graphics1 = Graphics.FromHdc(ptr1))
{
Bitmap bitmap1 = new Bitmap(rectangle1.Width, rectangle1.Height);
using (Graphics graphics2 = Graphics.FromImage(bitmap1))
this.PerformPaint(new PaintEventArgs(graphics2, rectangle1));
graphics1.DrawImageUnscaled(bitmap1, 0, 0);
}
if(isPaintMessage)
User32.EndPaint(m.HWnd, ref paintstruct1);
}