删除它们比今天的日期较旧的文件 | 删除它们比今天的日期较旧的文件

本文介绍了删除它们比今天的日期较旧的文件的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我在yyyyMMdd_hhmmss_abc.txt在特定位置的格式的某些文件。
使用下面的code，我能够获得与该文件夹中的_abc.txt的所有文件。

  fileArray = Directory.GetFiles（@C：//文档，*的abc.txt）;
的for（int i = 0; I＆LT; fileArray.Length;我++）
{
    fileArray [I] = Path.GetFileNameWithoutExtension（fileArray [I]）;
    Console.WriteLine（fileArray [I]）;
}

但现在我想读的文件名，分割，然后转换成日期时间对象，这样我可以检查的条件（在今天的日期以上）并删除它们。

I want to split it into 2016, 04 , 26 and then convert into date time object usingDatetime d1 = new Datetime(2016,04,26) and then do other operations.

Is there any other way to solve this problem?

Thanks in advance

解决方案

The filename is already in a sortable format based on the date. Instead of parsing bits of the filename into a DateTime object, why not create a filename based on today's date and filter your array of filenames down to only those that are string-comparison-less than your today's-date filename? It's probably quite a bit faster than doing date parsing on each filename, for large lists of files.

For example:

var path = "c:\\whatever";
var suffix = "_abc.txt";
var todaysFilename = DateTime.Now.ToString("yyyyMMdd_hhmmss") + suffix;
var filesToDelete = Directory.EnumerateFiles(path, "*" + suffix)
    .Select(Path.GetFileName)
    .Where(fileName => string.Compare(fileName, todaysFilename, StringComparison.Ordinal) < 0)
    .ToArray();

foreach (var file in filesToDelete)
{
    File.Delete(Path.Combine(path, file));
}

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