使用C#删除文件

时间:2015-01-06 20:52:35

标签: c# file-io

我已经编写了一个运动检测winform c#desktop app。

动画帧作为单独的jpeg保存到我的硬盘中。

我录制了4台摄像机。这由变量表示:

   camIndex

每个jpeg都在文件结构下:

c:\ The Year \ The Month \ The Day \ The Hour \ The Minute

确保目录中的每个文件都没有太多文件。

我的目的是让我的应用程序全天候运行。该应用程序可能会因系统重启或用户选择暂时关闭它等原因而停止。

目前,我有一个计时器而不是每5分钟运行一次,以删除超过24小时的文件。

我发现以下代码是内存密集型的,并且在几天的时间内,explorer.exe已经爬进RAM内存。

我的动作应用程序需要一直处于打开状态,因此低内存占用对于这种“归档”至关重要......

以下代码很长,在我看来非常低效。有没有更好的方法来实现我的目标?

我使用此代码:

List<string> catDirs = Directory.EnumerateDirectories(Shared.MOTION_DIRECTORY, "*", SearchOption.TopDirectoryOnly).ToList();
for (int index = 0; index < catDirs.Count; index++)
{
   for (int camIndex = 0; camIndex < 4; camIndex++)
   {
       if (Directory.Exists(catDirs[index] + "\\Catalogues\\" + camIndex.ToString()))
       {
           List<string> years = GetDirectoryList(catDirs[index] + "\\Catalogues\\" + camIndex.ToString(), true);
           if (years.Count == 0)
           {
                Directory.Delete(catDirs[index]);
            }
            for (int yearIndex = 0; yearIndex < years.Count; yearIndex++)
            {
                DirectoryInfo diYear = new DirectoryInfo(years[yearIndex]);
                List<string> months = GetDirectoryList(years[yearIndex], true);
                if (months.Count == 0)
                {
                  Directory.Delete(years[yearIndex]);
                }
                for (int monthIndex = 0; monthIndex < months.Count; monthIndex++)
                {
                    DirectoryInfo diMonth = new DirectoryInfo(months[monthIndex]);
                    List<string> days = GetDirectoryList(months[monthIndex], true);
                    if (days.Count == 0)
                    {                          
                        Directory.Delete(months[monthIndex]);                           
                    }
                    for (int dayIndex = 0; dayIndex < days.Count; dayIndex++)
                    {
                        DirectoryInfo diDay = new DirectoryInfo(days[dayIndex]);
                        List<string> hours = GetDirectoryList(days[dayIndex], true);
                        if (hours.Count == 0)
                        {
                            Directory.Delete(days[dayIndex]);                              
                        }
                        for (int hourIndex = 0; hourIndex < hours.Count; hourIndex++)
                        {
                            DirectoryInfo diHour = new DirectoryInfo(hours[hourIndex]);
                            List<string> mins = GetDirectoryList(hours[hourIndex], false);
                            if (mins.Count == 0)
                            {
                                Directory.Delete(hours[hourIndex]);
                            }
                            for (int minIndex = 0; minIndex < mins.Count; minIndex++)
                            {
                                bool deleteMe = false;
                                DirectoryInfo diMin = new DirectoryInfo(mins[minIndex]);
                                DateTime foundTS = new DateTime(Convert.ToInt16(diYear.Name), Convert.ToInt16(diMonth.Name), Convert.ToInt16(diDay.Name),
                                Convert.ToInt16(diHour.Name), Convert.ToInt16(diHour.Name), 00);
                                double minutesElapsed = upToDateDate.Subtract(foundTS).TotalMinutes;
                               if (minutesElapsed > diff)
                               {
                                   deleteMe = true;
                               }
                               if (deleteMe)
                               {
                                   Directory.Delete(mins[minIndex], true);
                               }
                           }
                       }
                   }
               }
           }
       }
   }

1 个答案:

答案 0 :(得分:5)

这可能会有所帮助,但不会测试效率:

Directory
.GetFiles(@"[Path of your root directory]", "*.*", SearchOption.AllDirectories)
.Where(item =>
{
    try
    {
        var fileInfo = new FileInfo(item);
        return fileInfo.CreationTime < DateTime.Now.AddHours(-24);
    }
    catch (Exception)
    {
        return false;
    }
})
.ToList()
.ForEach(File.Delete);

确保添加正确的异常处理并避免僵尸尝试/空捕获(不推荐)