DPI Graphics Screen Resolution Pixels WinForm PrintPageEventArgs

Question

How do Dpi Points relate to Pixels for any display my application is running on?

int points;
Screen primary;

public Form1() {
  InitializeComponent();
  points = -1;
  primary = null;
}

void OnPaint(object sender, PaintEventArgs e) {
  if (points < 0) {
    points = (int)(e.Graphics.DpiX / 72.0F); // There are 72 points per inch
  }
  if (primary == null) {
    primary = Screen.PrimaryScreen;
    Console.WriteLine(primary.WorkingArea.Height);
    Console.WriteLine(primary.WorkingArea.Width);
    Console.WriteLine(primary.BitsPerPixel);
  }
}

Do I now have all of the information I need?

Can I use any of the information above to find out just how long 1200 pixels is?

Answer 1

DPI literally stands for "Dots Per Inch" - where dots==pixels. So to determine how long 1200 pixels is:

int inchesLong = (1200 / e.Graphics.DpiX);