如何固定打印单据打印c#的行宽

using System;
using System.Drawing;
using System.Drawing.Printing;

public class PrintExample
{
    private static int lineWidth = 80; // 行宽

    public static void Main()
    {
        PrintDocument pd = new PrintDocument();
        pd.PrintPage += new PrintPageEventHandler(PrintPage);
        pd.Print();
    }

    private static void PrintPage(object sender, PrintPageEventArgs e)
    {
        Graphics g = e.Graphics;
        Font font = new Font("Arial", 12);

        string documentText = "这是要打印的单据内容，可以是多行文本。";
        string[] lines = SplitTextByWidth(documentText, lineWidth);

        float y = 0;
        foreach (string line in lines)
        {
            g.DrawString(line, font, Brushes.Black, 0, y);
            y += font.GetHeight();
        }
    }

    private static string[] SplitTextByWidth(string text, int width)
    {
        int startIndex = 0;
        int endIndex = width;
        int length = text.Length;
        int lineCount = (length + width - 1) / width;
        string[] lines = new string[lineCount];

        for (int i = 0; i < lineCount; i++)
        {
            if (endIndex > length)
                endIndex = length;

            lines[i] = text.Substring(startIndex, endIndex - startIndex);
            startIndex = endIndex;
            endIndex += width;
        }

        return lines;
    }
}