通过PowerShell处理文本文件中的字符串以返回特定值

Question

I'm currently attempting to pull the version number out of an assemblyinfo.cs file and then append JUST the version number, 1.2.3.4, to another text file.

I've attempted to use the .split() method, but that only works if the item is already a string(from what I've read) and I pull the entirety of the string from the text file by using select-string

Here's what I'm working with

$a = cat "c:\\path_to_file\\AssemblyInfo.cs" | select-string AssemblyVersion

Which will produce: [assembly: AssemblyVersion("5.7.4.1")]

And then if I try to do $a.split(' " ') I will get

Method invocation failed because [System.Object[]] doesn't contain a method named 'split'. At line:1 char:21 + $versionstring.split <<<< (' " ') + CategoryInfo : InvalidOperation: (split:String) [], RuntimeException + FullyQualifiedErrorId : MethodNotFound

Which as I said, is due to the fact that it's considered as an Object, not a string.

The result that I want is like this though:

PS C:\> $a = '[assembly: AssemblyVersion("5.7.4.1")]'
$b = $a.split(' " ')
$b[2]
5.7.4.1

I'm assuming the issue is regarding the fact that I'm using CAT to display the contents and then pull the string, I'm not sure.

Answer 1

Select-String returns a MatchInfo object. The string value of the line is in the .line property of that object

 $a.line.split(' " ')

should give you the result you're looking for.

Use

 $a | Get-Member 

to see all the available properties that are returned.