[英]How to use Directory.EnumerateFiles excluding hidden and system files
I'm enumerating all files in a directory so that I can process them later. 我正在枚举目录中的所有文件,以便稍后处理它们。 I want to exclude hidden and system files. 我想排除隐藏和系统文件。
This is what I have so far: 这是我到目前为止:
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);
However if I look at the results I am still getting hidden and system files included: 但是,如果我查看结果,我仍然会隐藏并包含系统文件:
foreach (var folder in files)
{
foreach (var file in folder)
{
// value for file here still shows hidden/system file paths
}
}
I found this question which has a similar example from Jerome but I couldn't even get that to compile. 我发现这个问题与杰罗姆有类似的例子,但我甚至无法编译。
What am I doing wrong? 我究竟做错了什么?
.Where(f => (new FileInfo(f).Attributes & FileAttributes.Hidden & FileAttributes.System) == 0)
Since FileAttributes
values are flags, they are disjunctive on the bit level, so you can combine them properly. 由于FileAttributes
值是标志,因此它们在位级别上是分离的,因此您可以正确地组合它们。 As such, FileAttributes.Hidden & FileAttributes.System
will always be 0
. 因此, FileAttributes.Hidden & FileAttributes.System
将始终为0
。 So you're essentially checking for the following: 所以你基本上检查以下内容:
(new FileInfo(f).Attributes & 0) == 0
And that will always be true since you are removing any value with the & 0
part. 这将永远是真实的,因为您使用& 0
部分删除任何值。
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: 您要检查的是文件是否既没有这些标志,换句话说,如果没有两个组合的公共标志:
.Where(f => (new FileInfo(f).Attributes & (FileAttributes.Hidden | FileAttributes.System)) == 0)
You can also use Enum.HasFlag
to make this a bit better understandable: 你也可以使用Enum.HasFlag
使这个更容易理解:
.Where(f => !new FileInfo(f).Attributes.HasFlag(FileAttributes.Hidden | FileAttributes.System))
You can simplify your code a lot by using DirectoryInfo and FileInfo, eg: 您可以使用DirectoryInfo和FileInfo大量简化代码,例如:
var mask= FileAttributes.Hidden | FileAttributes.System;
var di=new DirectoryInfo(sourcePath);
var files=di.EnumerateFiles("*", SearchOption.AllDirectories)
.Where(fi=>(fi.Attributes & mask) == 0)
.GroupBy(fi=>fi.DirectoryName);
Your original code tried to do a bitwise AND between flags that had no common bits, so it returned 0. As a result, the bitwise AND with Attributes
also returned 0. 您的原始代码尝试在没有公共位的标志之间执行按位AND,因此返回0.因此,带Attributes
的按位AND也返回0。
The mask you want to check against is System or Hidden ie FileAttributes.Hidden | FileAttributes.System
要检查的掩码是System 或 Hidden,即FileAttributes.Hidden | FileAttributes.System
FileAttributes.Hidden | FileAttributes.System
. FileAttributes.Hidden | FileAttributes.System
。 Calculating this in advance simply makes for somewhat cleaner code 事先计算它只会使代码更清晰
You can use FileSystemInfo.Attributes.HasFlag
: 您可以使用FileSystemInfo.Attributes.HasFlag
:
DirectoryInfo dir = new DirectoryInfo( sourcePath );
var files = dir.EnumerateFiles("*", SearchOption.AllDirectories)
.Where(f => !f.Attributes.HasFlag(FileAttributes.Hidden) && !f.Attributes.HasFlag(FileAttributes.System))
.GroupBy(f => f.DirectoryName);
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