c#像素和英寸转换

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
namespace advanced_drawing
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void button1_Click(object sender, EventArgs e)
        {
            using (Font rulerFont = new Font("MS Sans Serif", 100f))
            {
                
                float ruleFontHeight = rulerFont.SizeInPoints ;
                RectangleF rulerRect = new RectangleF(0,100f, 100f, ruleFontHeight);
                Graphics g = this.CreateGraphics();
                g.DrawRectangle(Pens.Black, InchesTopixels(rulerRect.X), InchesTopixels(rulerRect.Y), InchesTopixels(rulerRect.Width), InchesTopixels(rulerRect.Height));
                Font font = new Font("Arial", 12);
                Brush brush = System.Drawing.Brushes.Red;
                g.DrawString("zhuzhao", font, brush, rulerRect); 
            }
        }
        public float InchesTopixels(float inches)
        {
            using (Graphics g = this.CreateGraphics())
            {
                return inches * g.DpiX;
            }
        }
    }
}