打印多页C#

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

public class PrintMultiPage
{
    private Font printFont;
    private string[] lines;
    
    public PrintMultiPage()
    {
        // 初始化打印字体
        printFont = new Font("Arial", 10);
        
        // 假设有一段文本需要打印
        string text = "这是要打印的文本内容。";
        
        // 将文本按行分割存储到数组中
        lines = text.Split(new[] { Environment.NewLine }, StringSplitOptions.None);
    }
    
    public void Print()
    {
        PrintDocument pd = new PrintDocument();
        
        // 设置打印事件处理程序
        pd.PrintPage += new PrintPageEventHandler(pd_PrintPage);
        
        // 调用打印机对话框选择打印机
        PrintDialog printDialog = new PrintDialog();
        pd.PrinterSettings = printDialog.PrinterSettings;
        
        // 调用打印预览对话框预览并设置打印参数
        PrintPreviewDialog printPreviewDialog = new PrintPreviewDialog();
        printPreviewDialog.Document = pd;
        printPreviewDialog.ShowDialog();
        
        // 开始打印
        pd.Print();
    }
    
    private void pd_PrintPage(object sender, PrintPageEventArgs ev)
    {
        float yPos = 0;
        int count = 0;
        
        // 每页最多打印的行数
        int linesPerPage = 50;
        
        // 计算打印的起始行数
        int startIndex = count * linesPerPage;
        
        // 打印每一页的内容
        while (count < lines.Length && count < startIndex + linesPerPage)
        {
            yPos = ev.MarginBounds.Top + (count % linesPerPage) * printFont.GetHeight(ev.Graphics);
            ev.Graphics.DrawString(lines[count], printFont, Brushes.Black, ev.MarginBounds.Left, yPos, new StringFormat());
            count++;
        }
        
        // 如果还有行数未打印，则需要再次打印
        if (count < lines.Length)
        {
            ev.HasMorePages = true;
        }
        else
        {
            ev.HasMorePages = false;
        }
    }
}