public static void SafeAction(this FileBase fileBase, string file, Action <string> action)
{
if (fileBase == null)
{
throw new ArgumentNullException("fileBase");
}
if (string.IsNullOrEmpty(file))
{
throw new ArgumentNullException("file");
}
if (action == null)
{
throw new ArgumentNullException("action");
}
var tmp = String.Concat(file, ".tmp");
action(tmp);
if (!fileBase.Exists(tmp))
{
throw new InvalidOperationException("action must create a file");
}
//fileBase.Replace(tmp, file, null); write a TestHelper for Replace and make a pull request first
fileBase.Delete(file);
fileBase.Move(tmp, file);
}