self-hosted powershell doesn't realize variable within a string

Asked Aug 09 '18 at 06:05

Active Aug 09 '18 at 06:51

Viewed 85 times

I have a self-hosted PowerShell environment and I have following script

$one = 10
$two = "The value of one is $one"

When I run this snippet within the PowerShell ISE the result is as I expect

The value of one is 10

When I run this within my self hosted PowerShell environment the string isn't realized and the result is unchanged. Does anybody have an idea how to invoke the standard behavior?

Best regards, zimmy

the full example

var script = $@"
            $one = 10
            $two = 'The value is $one'
     ";

var ps = PowerShell.Create();

ps.AddScript(script);
ps.Invoke();

var valueoftwo = ps.Runspace.SessionStateProxy.GetVariable("two");

Assert.Equal("The value is 10", valueoftwo);
// here the value is 'The value is $one'

edited Aug 09 '18 at 06:51

asked Aug 09 '18 at 06:05

zimmybln

2

What do you mean by self hosted PowerShell environment? – Mark Wragg Aug 09 '18 at 06:09
I reference to the nuget package Microsoft.PowerShell.5.ReferenceAssmblies, create a PowerShell object and a runspace and then run the script. – zimmybln Aug 09 '18 at 06:13
@zimmybln, do you have some code that demonstrates the issue? – boxdog Aug 09 '18 at 06:28
I edited the question. See above. – zimmybln Aug 09 '18 at 06:41
3

Your powershell string is single quoted `$two = 'The value is $one'` inside the C# string. Single quoted strings don't do variable interpolation in PowerShell. You will need to embed double quotes inside your C# string with backslashes `$two = \"the value is $one\"` - https://stackoverflow.com/a/3458058/478656 – TessellatingHeckler Aug 09 '18 at 06:53
That was it. Thanks a lot! – zimmybln Aug 09 '18 at 07:04

self-hosted powershell doesn't realize variable within a string

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