C#小票打印机动态纸张尺寸

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Printing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
 
namespace pdPrint
{
    public partial class Form1 : Form
    {
        private int lineSize;                //每行打印字数
        private List<string> textList;       //打印内容行
        private int lineHeight;              //打印行高
        private int fontSize;                //字大小
        public Form1()
        {
            lineSize = 20;                   //设置每行打印字数
            lineHeight = 22;                 //行高  1/100 英寸
            fontSize = 12;                   //字体大小 1/英寸
            InitializeComponent();
        }
 
        private void btn_Print_Click(object sender, EventArgs e)
        {
            if (string.IsNullOrWhiteSpace(this.txt_PrintText.Text))
            {
                return;
            }
 
            //原文字行或者段落内容
            var sourceTexts = this.txt_PrintText.Text.Split(new string[] { Environment.NewLine }, StringSplitOptions.RemoveEmptyEntries);
 
            //重新把文字进行分行树立
            textList = new List<string>();
            foreach (var item in sourceTexts)
            {
                if (!string.IsNullOrWhiteSpace(item))
                {
                    if (item.Length > lineSize)
                    {
                        textList.AddRange(GetArr(lineSize, item));
                    }
                    else
                    {
                        textList.Add(item);
                    }
                }
            }
 
 
            PrintDocument pd = new PrintDocument();
            pd.PrintPage += new PrintPageEventHandler(Print_Content);
            //纸张设置默认
            PaperSize pageSize = new PaperSize("自定义纸张", fontSize * lineSize, (textList.Count * lineHeight));
            pd.DefaultPageSettings.PaperSize = pageSize;
            try
            {
                pd.Print();
            }
            catch (Exception ex)
            {
                MessageBox.Show("打印失败." + ex.Message);
            }
        }
 
        /// <summary>
        /// 打印内容事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Print_Content(object sender, PrintPageEventArgs e)
        {
            var mark = 0;
            foreach (var item in textList)
            {
                e.Graphics.DrawString(item, new Font(new FontFamily("宋体"), fontSize), System.Drawing.Brushes.Black, 0, mark * lineSize);
                mark++;
            }
        }
 
        /// <summary>
        /// 根据内容进行分行
        /// </summary>
        /// <param name="linelen">每行字数</param>
        /// <param name="text">原文字行（段落）文字</param>
        /// <returns></returns>
        private List<string> GetArr(int linelen, string text)
        {
            var list = new List<string>();
            int listcount = text.Length % linelen == 0 ? text.Length / linelen : (text.Length / linelen) + 1;
            for (int j = 0; j < listcount; j++)
            {
                try
                {
                    list.Add(text.Substring(j * linelen, linelen));
                }
                catch (Exception)
                {
                    list.Add(text.Substring(j * linelen));
                }
            }
            return list;
        }
    }
}