Passing parameter values to a PowerShell script

Question

The following is a snippet from my PowerShell script where the values for the parameters $book and $author are not getting substituted. Please suggest some techniques that I can apply to fix it or share some code that can help me out.

$body = @{
version = '1.0'
inactive = 'false'
yml = { "Service1:\n book: $book\n author: $author\n "} | ConvertFrom-Json
} | ConvertTo-Json

$request = Invoke-WebRequest -UseBasicParsing -Method Post -Uri $uri -Body 
$body -Headers $headers -ContentType $contentType

$response = ConvertFrom-Json -InputObject $request.Content

vorou · Accepted Answer · 2017-08-10 14:33:36Z

1

You have some weird stuff going on in this line

... yml = { "Service1:\n book: $book\n author: $author\n "} | ConvertFrom-Json } | ConvertTo-Json

Because it says "do a script block with this body, and try to convert the script block to JSON".

So, if you want to have a JSON string in yml field, you have two options.

Write the proper JSON string yourself:

@{...put the rest of your elements here...; yml = "{Service1:'', book:'$book', author: '$author'}"

Populate a hashtable first and then convert it to JSON string:

@{...put the rest of your elements here...; yml = @{Service1=''; book='$book'; author='$author'} } | ConvertTo-Json

edited Aug 10, 2017 at 14:33

answered Aug 10, 2017 at 3:03

vorou

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4 Comments

dn_learner Over a year ago

@vorou...I think you may not have looked at the curly braces carefully.... the ConvertTo-Json is for the outer-most construct and the ConvertFrom-Json is only for that element in that hashtable... Please have another look... thank you for suggesting those 2 options... let me try and I'll let you knkow...

dn_learner Over a year ago

Please ignore my question as I am no longer seeking solutions... It has been taken care of thru some other technology. Really appreciate the hep though.

dn_learner Over a year ago

Please ignore my question as I am no longer seeking solutions... It has been taken care of thru some other technology. Really appreciate the hep though.

vorou Over a year ago

@dn_learner glad to hear you made it. Still, if my answer answered the original question, please mark it as an answer.

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