C#根据生成的格式化字符串打印发票，每个打印机页面一张发票

Question

我已经生成了一个单独的长发票字符串，这些发票按要求格式化。我现在需要在打印机上打印出来，每页显示一张发票。

我看过这些教程/帮助以及一些代码，我是：

https://msdn.microsoft.com/en-us/library/cwbe712d%28v=vs.110%29.aspx

https://social.msdn.microsoft.com/Forums/en-US/93e54c4f-fd07-4b60-9922-102439292f52/c-printing-a-string-to-printer?forum=csharplanguage

我主要关注第二个。

我最终得到的是（使用带有单个按钮的单个表单来处理VS C#项目）：

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 TestPrint
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private string stringToPrint = "HellornWorldrnrn<<< Page >>>WorldrnHello";
        private void button1_Click(object sender, EventArgs e)
        {
            //  Convert string to strings
            string[] seperatingChars = { "<<< Page >>>" };
            string[] printString = stringToPrint.Split(seperatingChars, System.StringSplitOptions.RemoveEmptyEntries);
            //  Connect to the printer
            PrintDocument printDocument1 = new PrintDocument();     // Stream to the printer
            //  Send to printer (reference: https://social.msdn.microsoft.com/Forums/en-US/93e54c4f-fd07-4b60-9922-102439292f52/c-printing-a-string-to-printer?forum=csharplanguage)
            foreach (string s in printString)
            {
                printDocument1.PrintPage += delegate (object sender1, PrintPageEventArgs e1)
                {
                    e1.Graphics.DrawString(s, new Font("Times New Roman", 12), new SolidBrush(Color.Black),
                    new RectangleF(0, 0, printDocument1.DefaultPageSettings.PrintableArea.Width,
                    printDocument1.DefaultPageSettings.PrintableArea.Height));
                };
                try
                {
                    printDocument1.Print();
                    printDocument1.Dispose();
                }
                catch (Exception ex)
                {
                    throw new Exception("Exception Occured While Printing", ex);
                }
            }
        }
    }
}

我把长字符串分成我想要打印到每一页的部分，然后把它发送到打印机。这对第一张发票/页面很好，但之后它只是将每个页面添加到第一张发票的图像上（我添加了printDocument1.Dispose();来尝试排序，但没有成功）。

我想知道的是，如何将字符串打印为单个字符串，同时每页保留一张发票。

编辑：如何将字符串生成为打印机的多页图像？

Answer 1

编辑：完整的解决方案。

 public partial class Form1 : Form
    {
        //string to print
        private string stringToPrint = "HellornWorldrnrn<<< Page >>>WorldrnHello";
        //list of strings/pages
        private List<string> pageData = new List<string>();
        //enumerator for iteration thru "pages"
        private IEnumerator pageEnumerator;
        //print document
        PrintDocument printDocument1;
        public Form1()
        {
            InitializeComponent();
        }
        private void button1_Click(object sender, EventArgs e)
        {
            //  Connect to the printer
            printDocument1 = new PrintDocument();
            //handle events
            printDocument1.BeginPrint += new PrintEventHandler(BeginPrint);
            printDocument1.PrintPage += new PrintPageEventHandler(PrintPage);

            try
            {
                //do print
                printDocument1.Print();
                printDocument1.Dispose();
            }
            catch (Exception ex)
            {
                throw new Exception("Exception Occured While Printing", ex);
            }
        }
        void BeginPrint(object sender, PrintEventArgs e)
        {
            //  Convert string to strings
            string[] seperatingChars = { "<<< Page >>>" };
            //generate some dummy strings to print
            pageData = stringToPrint.Split(seperatingChars, System.StringSplitOptions.RemoveEmptyEntries).ToList();
            // get enumerator for dummy strings
            pageEnumerator = pageData.GetEnumerator();
            //position to first string to print (i.e. first page)
            pageEnumerator.MoveNext(); 
        }
        private void PrintPage(object sender, PrintPageEventArgs e)
        {
            //define font, brush, and print area
            Font font = new Font("Times New Roman", 12);
            Brush brush = Brushes.Black;
            RectangleF area = new RectangleF(0, 0, printDocument1.DefaultPageSettings.PrintableArea.Width,
                    printDocument1.DefaultPageSettings.PrintableArea.Height);
            //print current page
            e.Graphics.DrawString(pageEnumerator.Current.ToString(), font, brush, area);
            // advance enumerator to determine if we have more pages.
            e.HasMorePages = pageEnumerator.MoveNext();
        }

    }

Answer 2

据我所见，这一行导致了您所描述的问题：

printDocument1.PrintPage += delegate(object sender1,
PrintPageEventArgs e1)

尝试将其更改为：

printDocument1.PrintPage = delegate(object sender1,
PrintPageEventArgs e1)