效果：
代码如下：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;
namespace lxw_LogViewer
{
public partial class frmMain : Form
{
public frmMain()
{
InitializeComponent();
}
long Offset = 0;//初始化偏移
String fileName = "";
private void btnOpen_Click(object sender, EventArgs e)
{
OpenFileDialog dialog = new OpenFileDialog();
dialog.Multiselect = false;//该值确定是否可以选择多个文件
dialog.Title = "请选择文件";
dialog.Filter = "文本文件(*.log;*.txt)|*.log;*.txt;";
if (dialog.ShowDialog() == System.Windows.Forms.DialogResult.OK && dialog.FileName != "")
{
rtxtShow.Text = "";
Offset = 0;
fileName = dialog.FileName;
txtFile.Text = fileName;
FileSystemWatcher watcher = new FileSystemWatcher();
watcher.Path = fileName.Substring(0, fileName.LastIndexOf("\\") + 1);
watcher.NotifyFilter = NotifyFilters.FileName | NotifyFilters.LastWrite;
watcher.Filter = fileName.Substring(fileName.LastIndexOf("\\") + 1);
watcher.Changed += new FileSystemEventHandler(watcher_Changed);
watcher.Created += new FileSystemEventHandler(watcher_Created);
watcher.Deleted += new FileSystemEventHandler(watcher_Deleted);
watcher.Renamed += new RenamedEventHandler(watcher_Renamed);
watcher.EnableRaisingEvents = true;
Offset = AppendContentToShow(Offset, fileName);
}
}
void watcher_Renamed(object sender, RenamedEventArgs e)
{
rtxtShow.Invoke(new Action(() =>
{
rtxtShow.AppendText("文件被重命名");
}));
}
void watcher_Deleted(object sender, FileSystemEventArgs e)
{
rtxtShow.Invoke(new Action(() =>
{
rtxtShow.AppendText("文件被删除");
}));
}
void watcher_Created(object sender, FileSystemEventArgs e)
{
rtxtShow.Invoke(new Action(() =>
{
rtxtShow.AppendText("文件被创建");
}));
}
void watcher_Changed(object sender, FileSystemEventArgs e)
{
Offset = AppendContentToShow(Offset, fileName);
}
private long AppendContentToShow(long offset, string filePath)
{
long newOffset = 0;
if (File.Exists(filePath))
{
using (FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
{
newOffset = fs.Length;
if (fs.CanSeek)
{
if (offset > fs.Length)
{
offset = fs.Length;
}
fs.Seek(offset, SeekOrigin.Begin);
byte[] b = new byte[newOffset - offset + 1];
int cnt, m = 0;
cnt = fs.ReadByte();
while (cnt != -1)
{
b[m++] = Convert.ToByte(cnt);
cnt = fs.ReadByte();
}
List<string> ltInfo = Encoding.UTF8.GetString(b).Split(new string[] { "\r\n" }, StringSplitOptions.None).ToList();
rtxtShow.Invoke(new Action(() =>
{
foreach (String item in ltInfo)
{
if (item.Contains("ERROR") || item.Contains("error"))
{
//高亮显示
rtxtShow.SelectionStart = rtxtShow.Text.Length;
rtxtShow.SelectionLength = item.Length;
rtxtShow.SelectionColor = Color.FromName("Red");
}
rtxtShow.AppendText(item + "\r\n");
}
}));
}
else
{
rtxtShow.Invoke(new Action(() =>
{
rtxtShow.AppendText("当前流不支持查找");
}));
}
}
}
return newOffset;
}
}
}