gistfile1.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.IO;
using System.Threading;

namespace ADLOGGER
{


	public partial class MainWindow : Form
	{
		public string LogLine
		{
			set
			{
				context.Send(new SendOrPostCallback((s) => txtLogBox.AppendText(value + Environment.NewLine)), null);
			}
		}

		public void listenlogAsync ()
		{
			context.Send(new SendOrPostCallback((s) => loglisten()), null);
		}

		private void loglisten()
		{
			// string path = "C:\\Windows\\debug\\NetSetup.LOG";
			string path = "C:\\Users\\Master\\text.txt";

			using (
				StreamReader reader = new StreamReader(
					new FileStream(
						path, FileMode.Open, FileAccess.Read, FileShare.ReadWrite
					)
				)
			)
			{
				//start at the end of the file
				long lastMaxOffset = reader.BaseStream.Length;
				LogLine = "Listening...";

				while (true)
				{
					System.Threading.Thread.Sleep(100);

					//if the file size has not changed, idle
					if (reader.BaseStream.Length == lastMaxOffset)
						continue;

					//seek to the last max offset
					reader.BaseStream.Seek(lastMaxOffset, SeekOrigin.Begin);

					//read out of the file until the EOF
					string line = "";
					while ((line = reader.ReadLine()) != null)
						LogLine = line;

					//update the last max offset
					lastMaxOffset = reader.BaseStream.Position;
				}
			}
		}





		private SynchronizationContext context;
		public static MainWindow _formHandle;

		public MainWindow()
		{
			InitializeComponent();

			_formHandle = this;

			//set up the SynchronizationContext
			context = SynchronizationContext.Current;
			if (context == null)
			{
				context = new SynchronizationContext();
			}
			listenlogAsync();

		}

		private void Form1_Load(object sender, EventArgs e)
		{


		}
	}
}