private void InitializeLogFile()
{
_semaphoreSlim.Wait();
try
{
LogFileName = Path.Combine(_workingFolder, $"WTS_{Configuration.Current.Environment}_{DateTime.Now.FormatAsDateForFilePath()}.log");
if (!Directory.Exists(_workingFolder))
{
Directory.CreateDirectory(_workingFolder);
}
if (CheckLogFileInUse(LogFileName))
{
LogFileName = LogFileName.Replace(".log", $"_{Guid.NewGuid().ToString()}.log");
}
StartLog();
}
catch (Exception exception)
{
Trace.TraceError($"Error initializating log file. Exception:\r\n{exception.ToString()}");
}
finally
{
_semaphoreSlim.Release();
}
}
/// <summary>
/// Initialises a log file writer and returns the delegate to use.
/// </summary>
/// <param name="filename">The filename to write to (not including path).</param>
/// <returns>An AddEntryDelegate that can be added to Log.OnNewLogEntry.</returns>
public static AddEntryDelegate WriteToFile(string filename)
{
try
{
LogFileName = Path.Combine(Application.StartupPath, filename);
bool append = false;
if (File.Exists(LogFileName))
{
// get last modified time
if (new FileInfo(LogFileName).LastWriteTime > DateTime.Now.AddSeconds(-4))
{
// modified in last 4 seconds: just transitioned sleep <=> running
append = true;
}
else
{
// overwrite, but keep previous log
string logfilename2 = LogFileName.Replace(".log", ".prev.log");
if (File.Exists(logfilename2))
{
File.Delete(logfilename2);
}
File.Move(LogFileName, logfilename2);
}
}
// open log file
logfile = new StreamWriter(LogFileName, append);
((StreamWriter)logfile).AutoFlush = true;
// write header
if (!append)
{
logfile.WriteLine("{0} v{1}", Application.ProductName, Application.ProductVersion);
logfile.WriteLine(Application.ExecutablePath);
logfile.WriteLine("Log created at {0:ddd, dd MMM yyyy HH:mm:ss G\\MTzzz}", DateTime.Now);
}
// return AddEntryDelegate
return(AppendToLogFile);
}
catch
{
// if error, return null AddEntryDelegate
logfile = null;
return(null);
}
}