博客

        /// <summary>
        /// 删除文件夹strDir中nDays天以前的文件
        /// </summary>
        /// <param name="dir"></param>
        /// <param name="days"></param>
        void DeleteOldFiles(string dir, int days)
        {
            try
            {
                if (!Directory.Exists(dir) || days < 1) return;

                var now = DateTime.Now;
                foreach (var f in Directory.GetFileSystemEntries(dir).Where(f => File.Exists(f)))
                {
                    var t = File.GetCreationTime(f);

                    var elapsedTicks = now.Ticks - t.Ticks;
                    var elapsedSpan = new TimeSpan(elapsedTicks);

                    if(elapsedSpan.TotalDays > days) File.Delete(f);
                }
            }
            catch (Exception)
            {
                // ignored
            }
        }