C#简单的文件阅读器
2024-08-24 23:52:39
写一个简单的文件阅读器
1、可以读取大文件（2G）
2、实现首页、下一页、前一页、末页的跳转
3、实现到指定页面的跳转，比如跳转到第**页
4、限制每页显示字符数 1029-4069byte，且用户可自定义该值
5、界面要能实时响应
6、用户可以创建自己的txt文件
7、界面可尽可能的简单
第一步：画界面
第二步：相应事件
上代码
using System;
using System.IO;
using System.Text;
using System.Windows.Forms; namespace txtReader
{
public partial class Form1 : Form
{
private static int PageTotal = ;
private static int PageCurrent = ;
public Form1()
{
InitializeComponent();
} /// <summary>
/// 打开文件
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void TsMenuOpen_Click(object sender, EventArgs e)
{
if (ofd.ShowDialog() == DialogResult.OK)
{
PageCurrent = ;
ReadTxt();
}
} private void ReadTxt()
{
byte[] byts = new byte[decimal.ToInt32(numericUpDown2.Value)];
using (var fs = File.OpenRead(ofd.FileName))
{
int MValue = decimal.ToInt32(numericUpDown2.Value);
int ValueFrom = MValue * PageCurrent;
fs.Position = ValueFrom;
fs.Read(byts, , MValue);
if (byts != null)
{
int v = (int)((fs.Length / decimal.ToInt32(numericUpDown2.Value)) + );
PageTotal = v;
txtShow.Text = Encoding.Default.GetString(byts);
}
fs.Close();
}
} /// <summary>
/// 保存文件
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void TxMenuSave_Click(object sender, EventArgs e)
{
SaveFileDialog sfd = new SaveFileDialog();
sfd.Filter = "文本文件|*.txt";
if (DialogResult.OK == sfd.ShowDialog())
{
using (StreamWriter sw = new StreamWriter(sfd.FileName, false, Encoding.Default))
{
sw.WriteLine(txtShow.Text.Trim());
sw.Close();
}
}
}
/// <summary>
/// 关闭文件
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void TxMenuClose_Click(object sender, EventArgs e)
{
this.Close();
}
/// <summary>
/// 首页
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void BtnFirst_Click(object sender, EventArgs e)
{
PageCurrent = ;
ReadTxt();
}
/// <summary>
/// 上一页
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void BtnPagePre_Click(object sender, EventArgs e)
{
PageCurrent = PageCurrent > ? PageCurrent - : ;
ReadTxt();
}
/// <summary>
/// 下一页
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void BtnPageNext_Click(object sender, EventArgs e)
{
PageCurrent++;
ReadTxt();
}
/// <summary>
/// 尾页
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void BtnPageEnd_Click(object sender, EventArgs e)
{
PageCurrent = PageTotal - ;
ReadTxt();
}
/// <summary>
/// 跳转
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void BtnPageTo_Click(object sender, EventArgs e)
{
PageCurrent = decimal.ToInt32(numericUpDown1.Value);
ReadTxt();
}
}
}
总结
这个小功能难点只用这个
确定读取文件的位置，和每次只读指定部分字符
using (var fs = File.OpenRead(ofd.FileName))
{
int MValue = decimal.ToInt32(numericUpDown2.Value);
int ValueFrom = MValue * PageCurrent;
fs.Position = ValueFrom;
fs.Read(byts, , MValue);
if (byts != null)
{
int v = (int)((fs.Length / decimal.ToInt32(numericUpDown2.Value)) + );
PageTotal = v;
txtShow.Text = Encoding.Default.GetString(byts);
}
fs.Close();
}
最后附上项目下载源码txtReader.zip
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