/// <summary>
/// Saves an object to a file, optionally keeping a backup of it.
/// </summary>
/// <param name="toSave">Object to save as a file.</param>
/// <param name="fileName">Name of the file to be saved.</param>
/// <param name="options">The serialization options.</param>
public void SaveToFile(T toSave, string fileName, FileStorageOption options = null)
{
Guard.NotEmpty(fileName, nameof(fileName));
Guard.NotNull(toSave, nameof(toSave));
if (options == null)
{
options = FileStorageOption.Default;
}
var filePath = Path.Combine(this.FolderPath, fileName);
var uniqueId = DateTime.UtcNow.Ticks;
var newFilePath = $"{filePath}.{uniqueId}.new";
var tempFilePath = $"{filePath}.{uniqueId}.temp";
File.WriteAllText(newFilePath,
JsonConvert.SerializeObject(toSave, options.Indent ? Formatting.Indented : Formatting.None,
options.GetSerializationSettings()));
// If the file does not exist yet, create it.
if (!File.Exists(filePath))
{
File.Move(newFilePath, filePath);
if (options.SaveBackupFile)
{
File.Copy(filePath, $"{filePath}.bak", true);
}
return;
}
if (options.SaveBackupFile)
{
File.Copy(filePath, $"{filePath}.bak", true);
}
// Delete the file and rename the temp file to that of the target file.
File.Move(filePath, tempFilePath);
File.Move(newFilePath, filePath);
try
{
File.Delete(tempFilePath);
}
catch (IOException)
{
// Marking the file for deletion in the future.
File.Move(tempFilePath, $"{filePath}.{uniqueId}.del");
}
}
static FileStorageOption()
{
Default = new FileStorageOption();
}