Скачать или смотреть Resolving the Azure DevOps PowerShell Task Issue with ConvertFrom-Json Arrays

Learn how to fix the `PowerShell` issue in `Azure DevOps` pipelines, where the `ConvertFrom-Json` command misses counting single item arrays correctly.
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Understanding the ConvertFrom-Json Issue in Azure DevOps

In the world of Azure DevOps, developers rely heavily on scripts to automate processes. One such common task is converting JSON data to PowerShell objects using the ConvertFrom-Json command. However, users have reported a peculiar issue: the command seems to miss counting single item arrays when run in Azure DevOps pipelines. This guide delves into this problem and provides a succinct solution to ensure accurate counting of items in your scripts.

The Problem Defined

Imagine you have a JSON file containing an array of objects, each with nested arrays. When you run a PowerShell script locally, everything behaves as expected. However, when you run the same script in Azure DevOps, you might notice discrepancies in the output. For instance, consider the following JSON:

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When running your PowerShell script that includes this JSON through Azure DevOps, you might see the following output for the shoessing count:

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But locally, the output would be:

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The discrepancy is clear: Azure DevOps fails to recognize the single item in the array appropriately.

The Solution to the Problem

This issue predominantly arises from the version of PowerShell that Azure DevOps runs — typically, it defaults to Windows PowerShell 5.1. The good news is that there's a simple fix that you can implement in your PowerShell script. By wrapping the resulting object in an array subexpression @ (), you can ensure accurate counting, even for single-item arrays.

Implementing the Fix

In your script where you are writing the output, modify the line that counts the items in shoessing from:

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to:

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Why This Works

Array Subexpression: By wrapping $shoessing with @ (), you ensure that PowerShell treats it as an array, even if it has only one item. This way, it reliably calculates the count correctly in all environments, including Azure DevOps.

Summary of Changes

Here’s a quick summary of modifications you may want to make in your Test-JSON.ps1 script:

Adjust the output line that counts the items in the array using the subexpression @ ().

Example of Adjusted Script

Here’s how your function should look after modification:

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Conclusion

The issue of single item counts in arrays when using ConvertFrom-Json in Azure DevOps can be resolved effortlessly. By applying the array subexpression @ (), you can ensure that your PowerShell scripts behave consistently across environments. This solution helps maintain the accuracy of your JSON data extraction processes. Embrace this straightforward adjustment, and your Azure DevOps tasks will run smoothly!