/// <summary>
/// Prepares a new file to write to.
/// </summary>
private void PrepareNewFile()
{
lock (FileSwitchLock)
{
string fileBaseName = LogFileFolder.FullName + LogFilePrefix + DateTime.Now.ToString("yyyy-MM-dd");
const string fileSuffix = ".txt";
CurrentLogFile = fileBaseName + fileSuffix;
var oldFiles = LogFileFolder.GetFiles().Where(x => x.Name.StartsWith(LogFilePrefix)).ToList();
if (oldFiles.Exists(x => x.FullName == CurrentLogFile))
{
CurrentLogFile = fileBaseName + "_" + DateTime.Now.Hour + DateTime.Now.Minute + DateTime.Now.Second + fileSuffix;
}
if (oldFiles.Count >= MaxIterations)
{
var earliesttFile = oldFiles.First(x => x.CreationTime == oldFiles.Min(c => c.CreationTime));
try
{
earliesttFile.Delete();
}
catch (IOException)
{
}
catch (UnauthorizedAccessException) when(!File.Exists(earliesttFile.FullName))
{
//Eat if file does not exist.
}
}
}
}
/// <summary>
/// Checks if a new file should be created or we a have an old one to write to. Deletes oldest file if <see cref="MaxIterations"/> is reached.
/// </summary>
private void ChooseFile()
{
var oldFiles = LogFileFolder.GetFiles().Where(x => x.Name.StartsWith(LogFilePrefix)).ToList();
bool createNewFile = true;
if (oldFiles.Count > 0)
{
createNewFile = false;
var latestFile = oldFiles.First(x => x.CreationTime == oldFiles.Max(c => c.CreationTime));
if (((DateTime.Now - latestFile.CreationTime).TotalDays > DaysBeforeNewFile) || latestFile.Length >= MaxFileSize)
{
createNewFile = true;
}
else
{
CurrentLogFile = latestFile.FullName;
}
}
if (createNewFile)
{
PrepareNewFile();
}
}