用Graphics类的CopyFromScreen实现屏幕截图如何设置分辨率

Question

参考: Changing the resolution of an Bitmap in C#string filename = System.IO.Path.Combine(System.IO.Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().Location), "image.png");Bitmap b = new System.Drawing.Bitmap(SystemInformation.VirtualScreen.Width, SystemInformation.VirtualScreen.Height);
Graphics g = Graphics.FromImage(b);
g.CopyFromScreen(0, 0, 0, 0, b.Size);Bitmap b2 = new Bitmap(500, 500);
g = Graphics.FromImage(b2);
g.DrawImage(b, new RectangleF(0, 0, b2.Width, b2.Height));b2.Save(filename, ImageFormat.Jpeg);
System.Diagnostics.Process.Start(filename);
Bitmap b = new Bitmap(SystemInformation.VirtualScreen.Width, SystemInformation.VirtualScreen.Height);
                Graphics g = Graphics.FromImage(b);
                g.CopyFromScreen(0, 0, 0, 0, b.Size);                Bitmap b2 = new Bitmap(100, 100);
                g = Graphics.FromImage(b2);
                g.DrawImage(b, new Rectangle(0, 0, b2.Width, b2.Height), 0, 0, b.Width, b.Height, GraphicsUnit.Pixel);                b2.Save(Strings.common_documents + "tmp_screenshot.jpg", ImageFormat.Jpeg);