string 如何在 PowerShell 中将字符串与变量连接起来？
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How do I concatenate strings with variables in PowerShell?
提问by Micah
I'm trying to build a file path in PowerShell and the string concatenation seems to be a little funky.
我正在尝试在 PowerShell 中构建一个文件路径，字符串连接似乎有点时髦。
I have a list of folders:
我有一个文件夹列表：
c:\code\MyProj1
c:\code\MyProj2
I want to get the path to a DLL file here:
我想在此处获取 DLL 文件的路径：
c:\code\MyProj1\bin\debug\MyProj1.dll
c:\code\MyProj2\bin\debug\MyProj2.dll
Here's what I'm trying to do:
这是我想要做的：
$buildconfig = "Debug"
Get-ChildItem c:\code | % {
Write-Host $_.FullName + "\" + $buildconfig + "\" + $_ + ".dll"
}
This doesn't work. How can I fix it?
这不起作用。我该如何解决？
回答by ravikanth
Try this
尝试这个
Get-ChildItem | % { Write-Host "$($_.FullName)$buildConfig$($_.Name).dll" }
In your code,
在您的代码中，
$build-Configis not a valid variable name.$.FullNameshould be$_.FullName$should be$_.Name
$build-Config不是有效的变量名。$.FullName应该$_.FullName$应该$_.Name
回答by craika
You could use the PowerShell equivalent of String.Format - it's usually the easiest way to build up a string. Place {0}, {1}, etc. where you want the variables in the string, put a -fimmediately after the string and then the list of variables separated by commas.
您可以使用等效于 String.Format 的 PowerShell - 它通常是构建字符串的最简单方法。将 {0}、{1} 等放置在字符串中您想要变量的位置，-f紧跟在字符串之后放置一个，然后是用逗号分隔的变量列表。
Get-ChildItem c:\code|%{'{0}\{1}\{2}.dll' -f $_.fullname,$buildconfig,$_.name}
(I've also taken the dash out of the $buildconfig variable name as I have seen that causes issues before too.)
（我也从 $buildconfig 变量名中去掉了破折号，因为我之前也看到过这会导致问题。）
回答by Shay Levy
Try the Join-Path cmdlet:
试试 Join-Path cmdlet：
Get-ChildItem c:\code\*\bin\* -Filter *.dll | Foreach-Object {
Join-Path -Path $_.DirectoryName -ChildPath "$buildconfig$($_.Name)"
}
回答by Jacob Ballard
This will get all dll files and filter ones that match a regex of your directory structure.
这将获取所有 dll 文件并过滤与您的目录结构的正则表达式匹配的文件。
Get-ChildItem C:\code -Recurse -filter "*.dll" | where { $_.directory -match 'C:\\code\\myproj.\\bin\\debug'}
Get-ChildItem C:\code -Recurse -filter "*.dll" | where { $_.directory -match 'C:\\code\\myproj.\\bin\\debug'}
If you just want the path, not the object you can add | select fullnameto the end like this:
如果您只想要路径，而不是可以| select fullname像这样添加到末尾的对象：
Get-ChildItem C:\code -Recurse -filter "*.dll" | where { $_.directory -match 'C:\\code\\myproj.\\bin\\debug'} | select fullname
Get-ChildItem C:\code -Recurse -filter "*.dll" | where { $_.directory -match 'C:\\code\\myproj.\\bin\\debug'} | select fullname
