Скачать или смотреть Solving the TypeNotFound Error for System.IO.Compression in PowerShell

Learn how to fix the `TypeNotFound` error for `System.IO.Compression.ZipArchiveMode` in PowerShell by properly loading required assemblies.
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This video is based on the question https://stackoverflow.com/q/68006423/ asked by the user 'Abhay Gupta' ( https://stackoverflow.com/u/6017021/ ) and on the answer https://stackoverflow.com/a/68006685/ provided by the user 'mklement0' ( https://stackoverflow.com/u/45375/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Troubleshooting PowerShell: Fixing the TypeNotFound Error for ZipArchiveMode

If you're working with PowerShell and handling ZIP files using the .NET libraries, you might encounter a peculiar problem: the TypeNotFound error when trying to access System.IO.Compression.ZipArchiveMode. This issue often arises with users who are accustomed to working with different versions of PowerShell, especially older versions. In this post, we'll explore the reasons behind this error and provide an effective solution to ensure your script runs smoothly.

Understanding the Problem

The error message appears in specific scenarios where you attempt to access the ZipArchiveMode enumeration without the necessary assembly references. For example, when running the following script:

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

You may see an output similar to this:

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

Justification for the Error

This issue generally arises because the System.IO.Compression.ZIpArchiveMode type belongs to a specific assembly that needs to be loaded before you can use it in your script. Relying solely on System.IO.Compression.FileSystem is insufficient as it does not automatically include types declared in the System.IO.Compression namespace.

Solution to the Problem

To resolve this TypeNotFound error, you only need to make a small adjustment to your PowerShell script. It involves loading the required assembly explicitly. Here's how you can achieve this:

Step-by-Step Fix

Load the Necessary Assemblies: Modify your script to include the System.IO.Compression assembly along with the existing System.IO.Compression.FileSystem. You can do this by using the following line of code:

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

Verify the Assembly Load: After loading the assemblies, verify that both types are successfully loaded by executing the following lines:

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

Example Updated Script

Here is the complete updated script to handle ZIP operations including addressing the TypeNotFound issue:

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

Conclusion

By ensuring that both System.IO.Compression and System.IO.Compression.FileSystem assemblies are explicitly loaded in your PowerShell script, you can eliminate the TypeNotFound error and smoothly utilize the ZipArchiveMode enumeration. This small adjustment can save you time and frustration, enabling you to focus on the larger tasks at hand without running into assembly-related hiccups.

If you follow these simple steps, you'll be well on your way to effectively managing ZIP files in PowerShell!