sanlu_new/sanlu_c#/SunRoxmServer/AppUpdater/Microsoft.Samples.AppUpdater/UpdateLog.cs

using System;
using System.IO;

namespace Microsoft.Samples.AppUpdater
{
	internal class UpdateLog
	{
		private const string LogFileName = "AppUpdate.log";

		internal UpdateLog()
		{
			string path = Path.Combine(GetLogFilePath(), "AppUpdate.log");
			if (!File.Exists(path))
			{
				File.Create(path);
				File.SetAttributes(path, FileAttributes.Hidden);
			}
		}

		internal void AddSuccess(string versionNumber)
		{
			string path = Path.Combine(GetLogFilePath(), "AppUpdate.log");
			FileStream stream = File.Open(path, FileMode.Append);
			StreamWriter streamWriter = new StreamWriter(stream);
			string value = DateTime.Now.ToString() + ":  Successful update to version:  " + versionNumber;
			streamWriter.WriteLine(value);
			streamWriter.Close();
		}

		internal void AddError(string errorMessage)
		{
			string path = Path.Combine(GetLogFilePath(), "AppUpdate.log");
			FileStream stream = File.Open(path, FileMode.Append);
			StreamWriter streamWriter = new StreamWriter(stream);
			string value = DateTime.Now.ToString() + ":  UPDATE FAILED with the following error message:";
			streamWriter.WriteLine(value);
			streamWriter.WriteLine(errorMessage);
			streamWriter.Close();
		}

		private string GetLogFilePath()
		{
			DirectoryInfo directoryInfo = new DirectoryInfo(AppDomain.CurrentDomain.BaseDirectory);
			return directoryInfo.Parent.Parent.FullName + "\\";
		}
	}
}