如何使用打印预览查看文件中显示的文本

Question

我正在开发一个应用程序来print preview用户喜欢打印的文件，我编写了以下代码，但我无法在预览页面上看到文本或内容为什么会发生任何人都可以帮助我

我的代码如下

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Drawing.Printing;
using System.IO;

namespace WindowsApplication2
{
    public partial class Form1 : Form
    {
    private PrintPreviewDialog printPreviewDialog1 = new PrintPreviewDialog();
    private PrintDocument printDocument1 = new PrintDocument();

    // Declare a string to hold the entire document contents.
    private string documentContents;

    // Declare a variable to hold the portion of the document that
    // is not printed.
    private string stringToPrint;


    public Form1()
    {
        InitializeComponent();
    }

    private void Form1_Load(object sender, EventArgs e)
    {

    }

    private void ReadDocument()
    {

        string docName = "ACH.txt";
        string docPath = @"c:\";
        printDocument1.DocumentName = docName;
        using (FileStream stream = new FileStream(docPath + docName, FileMode.Open))
        using (StreamReader reader = new StreamReader(stream))
        {
            documentContents = reader.ReadToEnd();
        }
        stringToPrint = documentContents;
    }

    private void printToolStripMenuItem_Click(object sender, EventArgs e)
    {
        ReadDocument();
        printPreviewDialog1.Document = printDocument1;
        printPreviewDialog1.ShowDialog();
    }
    void printDocument1_PrintPage(object sender, PrintPageEventArgs e)
    {
        int charactersOnPage = 5;
        int linesPerPage = 10;

        // Sets the value of charactersOnPage to the number of characters 
        // of stringToPrint that will fit within the bounds of the page.
        e.Graphics.MeasureString(stringToPrint, this.Font,
            e.MarginBounds.Size, StringFormat.GenericTypographic,
            out charactersOnPage, out linesPerPage);

        // Draws the string within the bounds of the page.
        e.Graphics.DrawString(stringToPrint, this.Font, Brushes.Black,
        e.MarginBounds, StringFormat.GenericTypographic);

        // Remove the portion of the string that has been printed.
        stringToPrint = stringToPrint.Substring(charactersOnPage);

        // Check to see if more pages are to be printed.
        e.HasMorePages = (stringToPrint.Length > 0);

        // If there are no more pages, reset the string to be printed.
        if (!e.HasMorePages)
            stringToPrint = documentContents;
    }
}

}

Answer 1

你还没有连接你的打印事件。 将此添加到您的表单构造函数中：

public Form1()
{
  InitializeComponent();
  printDocument1.PrintPage += new PrintPageEventHandler(this.printDocument1_PrintPage);
}