如何使用Directory.EnumerateFiles排除隐藏文件和系统文件 [英] How to use Directory.EnumerateFiles excluding hidden and system files

问题描述

我正在枚举目录中的所有文件，以便以后可以处理它们.我想排除隐藏文件和系统文件.

I'm enumerating all files in a directory so that I can process them later. I want to exclude hidden and system files.

这是我到目前为止所拥有的:

This is what I have so far:

IEnumerable<IGrouping<string, string>> files;

files = Directory.EnumerateFiles(sourcePath, "*", SearchOption.AllDirectories)
       .Where(f => (new FileInfo(f).Attributes & FileAttributes.Hidden & FileAttributes.System) == 0)
       .GroupBy(Path.GetDirectoryName);

但是，如果我查看结果，我仍然会隐藏起来并且包括系统文件:

However if I look at the results I am still getting hidden and system files included:

foreach (var folder in files)
{
    foreach (var file in folder)
    {
        // value for file here still shows hidden/system file paths
    }
}

我发现了此问题与杰罗姆(Jerome)类似，但我什至无法编译它.

I found this question which has a similar example from Jerome but I couldn't even get that to compile.

我在做什么错了?

推荐答案

.Where(f => (new FileInfo(f).Attributes & FileAttributes.Hidden & FileAttributes.System) == 0)

由于 FileAttributes 值是标志，它们在位级别上是分离的，因此您可以适当地将它们组合在一起.因此，FileAttributes.Hidden & FileAttributes.System将始终为0.因此，您实质上是在检查以下内容:

Since FileAttributes values are flags, they are disjunctive on the bit level, so you can combine them properly. As such, FileAttributes.Hidden & FileAttributes.System will always be 0. So you’re essentially checking for the following:

(new FileInfo(f).Attributes & 0) == 0

这将永远是正确的，因为您要删除& 0部分中的任何值.

And that will always be true since you are removing any value with the & 0 part.

您要检查的是文件中是否没有这些标志，或者换句话说，如果没有共同的标志并结合使用这两种标志:

What you want to check is whether the file has neither of those flags, or in other words, if there are no common flags with the combination of both:

.Where(f => (new FileInfo(f).Attributes & (FileAttributes.Hidden | FileAttributes.System)) == 0)

您还可以使用 Enum.HasFlag 使其更容易理解:

You can also use Enum.HasFlag to make this a bit better understandable:

.Where(f => !new FileInfo(f).Attributes.HasFlag(FileAttributes.Hidden | FileAttributes.System))

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