[英]PowerShell string format different behaviour within function
While using powershell I struggle to build up a filename from two variables.在使用 powershell 时,我很难从两个变量中建立一个文件名。 When I originally creaded the powershell script, it was working fine.
当我最初创建 powershell 脚本时,它运行良好。 Now I have tried to move some repeatable steps into a function, but the string behaviour is different.
现在我尝试将一些可重复的步骤移动到 function 中,但字符串行为不同。
MWE: MWE:
$topa = "ABC"
$topb = "XYZ"
function Test-Fun{
param(
$a,
$b
)
echo "$($a)H$($b).csv"
}
echo "$($topa)H$($topb).csv"
Test-Fun($topa, $topb)
The output on my system is我系统上的 output 是
ABCHXYZ.csv
ABC XYZH.csv
Originally, I wanted to use an underscore instead of H and thought that is causing issues, but its not.最初,我想使用下划线而不是 H 并认为这会导致问题,但事实并非如此。 What did I miss or rather what is the difference between string expansion within a function and outside of it?
我错过了什么,或者更确切地说,function 内部和外部的字符串扩展有什么区别?
You are calling Test-Func
wrong.您调用
Test-Func
是错误的。 The comma after $topa
will create an array, so you basically pass []"ABC", "XYZ" as an array to $a
. $topa
之后的逗号将创建一个数组,因此您基本上将 []"ABC", "XYZ" 作为数组传递给$a
。 In that case $b
is empty!在这种情况下
$b
是空的!
You can easily fix this by removing the comma (also the parentheses are not necessary):您可以通过删除逗号轻松解决此问题(括号也不是必需的):
Test-Fun $topa $topb
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