Two variables in one string but only interpret one

I'm trying to do an API call in PowerShell. The problem is that the call contains a "$" and PowerShell interprets that as a variable, and it also contains a real variable it looks something like this:

Is there a way how I can make it so $format is not interpreted, but $foo is?

(I need the "" around $foo)

I already solved this by just splitting it up into two string and then adding them together, but this seems very unstable to me.

CodePudding user response：

I'd strongly recommend construct your uri from multiple parts:

# define base uri
$baseUri = "http://foo.example/bar()"

# define individual query parameters
$queryParameters = [ordered]@{
    '$format' = 'json'
    'filter' = 'id eq "{0}"' -f $foo
}

# concatenate query parameters
$paramString = $queryParameters.GetEnumerator().ForEach({ 
    $_.Key,$_.Value -join '=' 
}) -join '&'

# construct full URL from base   parameter string
$apicall = $baseUri,$paramString -join '?'

The ' single-quotes around $format will prevent any attempt at variable expansion.

The literal "'s are preserved in the filter string by also using ' to define a string formatting template, but then using the -f operator (which will expand $foo before applying).

This approach obviously requires more source code, but it makes it easier to maintain the URI parameters.

If everything but the $foo value is static, you can also use an expandable here-string literal (@" instead of @') with a $ character, simply escape it using a backtick:

$apicall = @"
http://foo.example/bar()?`$format=json&filter=id eq "$foo"
"@