Скачать или смотреть How to Use PowerShell to Read AppConfig in Your Project

Learn how to effectively read configuration files in PowerShell by removing comments from JSON. Get connection strings seamlessly for your project.
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This video is based on the question https://stackoverflow.com/q/76219591/ asked by the user 'Ken Kazinski' ( https://stackoverflow.com/u/2923237/ ) and on the answer https://stackoverflow.com/a/76250325/ provided by the user 'Ken Kazinski' ( https://stackoverflow.com/u/2923237/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Introduction

Working with configuration files is a common task in software development, particularly when you're managing connection strings for databases. However, if you're using PowerShell to read these configuration files, you might encounter issues—especially with JSON formats. This post covers a specific scenario where a developer faced a challenge while trying to read an appsettings.json file in PowerShell, and how they resolved it.

The Problem

The developer attempted to use the following command to read their appsettings.json content into PowerShell:

[[See Video to Reveal this Text or Code Snippet]]

Unfortunately, they were met with the following error message:

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This issue arose even though the same appsettings.json file worked perfectly when accessed by the C- application. The developer was in search of a straightforward method to read the configuration, akin to using the ConfigurationBuilder in C-:

[[See Video to Reveal this Text or Code Snippet]]

The Solution

The primary cause of the issue was found to be comments present in the JSON file. While JSON does not officially support comments, some developers include them in a manner that would be parsed correctly by other languages but can lead to errors in PowerShell.

Step-by-Step Breakdown of the Solution

Here’s how to effectively read your JSON configuration file in PowerShell when dealing with comments:

Read the JSON File: Use Get-Content to read your JSON configuration file.

Filter Out Comments: Incorporate Where-Object to exclude any lines containing comments. Here’s an example of how you can achieve that:

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Convert to JSON Object: After filtering out the comments, the next step is to convert the filtered string into a JSON object:

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Accessing the Connection String

Once the JSON has been correctly parsed, you can access any properties, such as your connection strings, as follows:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

In summary, handling JSON files in PowerShell is straightforward if you address the common pitfalls, such as comments within the files. By filtering these comments, you can successfully parse your JSON files, allowing you to access necessary configuration details like connection strings easily. With this knowledge, you can enhance your PowerShell scripts and streamline your database interactions as part of larger projects.

If you found this post helpful or have any questions, feel free to leave a comment below!