如何筛选Directory.EnumerateFiles多个标准是什么? [英] How to filter Directory.EnumerateFiles with multiple criteria?
问题描述
我有以下的code:
List<string> result = new List<string>();
foreach (string file in Directory.EnumerateFiles(path,"*.*",
SearchOption.AllDirectories)
.Where(s => s.EndsWith(".mp3") || s.EndsWith(".wma")))
{
result.Add(file);
}
它工作正常,然后做了我所需要的。除了一小的事情。我想找到一个更好的方法来对多个扩展名进行筛选。我想用一个字符串数组,过滤器,如这样的:
It works fine and does what I need. Except for one small thing. I would like to find a better way to filter on multiple extensions. I would like to use a string array with filters such as this:
string[] extensions = { "*.mp3", "*.wma", "*.mp4", "*.wav" };
什么是最有效的方式使用.NET框架4.0 / LINQ做到这一点?有什么建议?
What is the most efficient way to do this using NET Framework 4.0/LINQ? Any suggestions?
我倒是AP preciate任何帮助,是一个偶然的程序员: - )
I'd appreciate any help being an occasional programmer :-)
推荐答案
我创造了一些辅助的方法来解决这个问题,我的博客有关今年早些时候。
I created some helper methods to solve this which I blogged about earlier this year.
一个版本需要一个正则表达式 \ MP3。| \ .MP4
,而另一个字符串列表,并运行在平行
One version takes a regex pattern \.mp3|\.mp4
, and the other a string list and runs in parallel.
public static class MyDirectory
{ // Regex version
public static IEnumerable<string> GetFiles(string path,
string searchPatternExpression = "",
SearchOption searchOption = SearchOption.TopDirectoryOnly)
{
Regex reSearchPattern = new Regex(searchPatternExpression, RegexOptions.IgnoreCase);
return Directory.EnumerateFiles(path, "*", searchOption)
.Where(file =>
reSearchPattern.IsMatch(Path.GetExtension(file)));
}
// Takes same patterns, and executes in parallel
public static IEnumerable<string> GetFiles(string path,
string[] searchPatterns,
SearchOption searchOption = SearchOption.TopDirectoryOnly)
{
return searchPatterns.AsParallel()
.SelectMany(searchPattern =>
Directory.EnumerateFiles(path, searchPattern, searchOption));
}
}
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