public static DateTime GetMostRecentBackup(string sourceFilePath)
{
DirectoryInfo backupFolder = FileBackup.GetOrCreateBackupFolder(sourceFilePath);
FileInfo mostRecentBackupFile = FileBackup.GetBackupFiles(backupFolder, sourceFilePath).OrderByDescending(file => file.LastWriteTimeUtc).FirstOrDefault();
if (mostRecentBackupFile != null)
{
return(mostRecentBackupFile.LastWriteTimeUtc);
}
return(DateTime.MinValue.ToUniversalTime());
}
// Full version: Copy or move file to backup version with separated path/source file name
public static bool TryCreateBackup(string folderPath, string sourceFileName, bool moveInsteadOfCopy)
{
string sourceFilePath = Path.Combine(folderPath, sourceFileName);
if (File.Exists(sourceFilePath) == false)
{
// nothing to do
return(false);
}
// create backup folder if needed
DirectoryInfo backupFolder = FileBackup.GetOrCreateBackupFolder(sourceFilePath);
// create a timestamped copy of the file
// file names can't contain colons so use non-standard format for timestamp with dashes for 24 hour-minute-second separation
string sourceFileNameWithoutExtension = Path.GetFileNameWithoutExtension(sourceFileName);
string sourceFileExtension = Path.GetExtension(sourceFileName);
string destinationFileName = String.Concat(sourceFileNameWithoutExtension, ".", DateTime.Now.ToString("yyyy-MM-dd.HH-mm-ss"), sourceFileExtension);
string destinationFilePath = Path.Combine(backupFolder.FullName, destinationFileName);
try
{
if (moveInsteadOfCopy)
{
File.Move(sourceFilePath, destinationFilePath);
}
else
{
File.Copy(sourceFilePath, destinationFilePath, true);
}
}
catch
{
// Old code: We just don't create the backup now. While we previously threw an exception, we now test and warn the user earlier on in the code that a backup can't be made
// System.Diagnostics.Debug.Print("Did not back up" + destinationFilePath);
// throw new PathTooLongException("Backup failure: Could not create backups as the file path is too long", e);
return(false);
}
// age out older backup files
IEnumerable <FileInfo> backupFiles = FileBackup.GetBackupFiles(backupFolder, sourceFilePath).OrderByDescending(file => file.LastWriteTimeUtc);
foreach (FileInfo file in backupFiles.Skip(Constant.File.NumberOfBackupFilesToKeep))
{
File.Delete(file.FullName);
}
return(true);
}
public static DateTime GetMostRecentBackup(string sourceFilePath)
{
try
{
DirectoryInfo backupFolder = FileBackup.GetOrCreateBackupFolder(sourceFilePath);
FileInfo mostRecentBackupFile = null;
if (backupFolder != null)
{
mostRecentBackupFile = FileBackup.GetBackupFiles(backupFolder, sourceFilePath, false).OrderByDescending(file => file.LastWriteTime).FirstOrDefault();
}
if (backupFolder != null && mostRecentBackupFile != null)
{
return(mostRecentBackupFile.LastWriteTime);
}
return(DateTime.MinValue);
}
catch
{
return(DateTime.MinValue);
}
}
// Full version: Copy or move file to backup version with separated path/source file name
// If specialBackup is non-empty, it creates a special checkpointfile, usually to flag a non=-backwards compatable upgrade to the tdb and ddb files
public static bool TryCreateBackup(string folderPath, string sourceFileName, bool moveInsteadOfCopy, string specialBackup)
{
string sourceFilePath = Path.Combine(folderPath, sourceFileName);
if (File.Exists(sourceFilePath) == false)
{
// nothing to do
return(false);
}
// create backup folder if needed
DirectoryInfo backupFolder = FileBackup.GetOrCreateBackupFolder(sourceFilePath);
if (backupFolder == null)
{
// Something went wrong...
return(false);
}
// create a timestamped copy of the file
// file names can't contain colons so use non-standard format for timestamp with dashes for 24 hour-minute-second separation
// If there is a specialBackup term, then we modify anadd it before the timestamp
string sourceFileNameWithoutExtension = Path.GetFileNameWithoutExtension(sourceFileName);
string sourceFileExtension = Path.GetExtension(sourceFileName);
specialBackup = specialBackup == String.Empty
? String.Empty
: Constant.File.BackupCheckpointIndicator + specialBackup;
string destinationFileName = String.Concat(sourceFileNameWithoutExtension, specialBackup, ".", DateTime.Now.ToString("yyyy-MM-dd.HH-mm-ss"), sourceFileExtension);
string destinationFilePath = Path.Combine(backupFolder.FullName, destinationFileName);
try
{
if (File.Exists(destinationFilePath) && new System.IO.FileInfo(destinationFilePath).Attributes.HasFlag(System.IO.FileAttributes.ReadOnly))
{
// Can't overwrite it...
return(false);
}
if (moveInsteadOfCopy)
{
File.Move(sourceFilePath, destinationFilePath);
}
else
{
File.Copy(sourceFilePath, destinationFilePath, true);
}
}
catch
{
// Old code: We just don't create the backup now. While we previously threw an exception, we now test and warn the user earlier on in the code that a backup can't be made
// System.Diagnostics.Debug.Print("Did not back up" + destinationFilePath);
// throw new PathTooLongException("Backup failure: Could not create backups as the file path is too long", e);
return(false);
}
// age out older backup files (this skips the special checkpoint files)
IEnumerable <FileInfo> backupFiles = FileBackup.GetBackupFiles(backupFolder, sourceFilePath, true).OrderByDescending(file => file.LastWriteTimeUtc);
if (backupFiles == null)
{
// We can't delete older backups, but at least we were able to create a backup.
return(true);
}
foreach (FileInfo file in backupFiles.Skip(Constant.File.NumberOfBackupFilesToKeep))
{
File.Delete(file.FullName);
}
return(true);
}