static int GetLastRollCount() {
Func<string, int> parser = str => {
int result;
return int.TryParse(str, out result) ? result : 0;
};
var c = from fi in new DirectoryInfo(LOG_DIR).GetFiles(string.Format("*_{0:yyyyMMdd}_*.log", DateTime.Now))
let _i = fi.FullName.LastIndexOf('_')
let dot = fi.FullName.LastIndexOf('.')
where _i != -1 && dot != -1 && dot > _i
let count = parser(fi.FullName.Substring(_i + 1, dot - _i - 1))
orderby count descending
select count;
return c.FirstOrDefault();
}
