Solving the PowerShell Issue: Only Loading Classes from the Latest Module

Discover how to handle PowerShell's module loading issue where only classes from the latest module are accessible. Learn step-by-step solutions for effective use of multiple modules.
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Understanding the PowerShell Class Loading Issue

If you are working with PowerShell, you may have encountered a perplexing situation where classes from earlier modules become inaccessible after importing a new module. This issue can be particularly frustrating, especially when you want to utilize multiple classes across different modules seamlessly in your scripts. In this guide, we will dive into this problem and arm you with effective strategies to avoid it.

The Problem Explained

When you import a module in PowerShell, it loads the classes defined in that module into memory. However, the problem arises when you import another module after the first one. In doing so, PowerShell clears out the previously loaded classes from memory, limiting your access to only those defined in the most recently loaded module. Here's a quick overview of the scenario:

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

The Issue in Action

When you execute the following commands in PowerShell:

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

The attempt to access TestClass1 after loading testmodule2 fails, as PowerShell has forgotten about it.

The Solution: Loading Multiple Modules at Once

To ensure that both classes are accessible simultaneously, you can load both modules in a single command. This prevents PowerShell from clearing out the previous classes when a new module is imported. Here’s how:

Step-by-Step Instructions

Use Single Command for Loading: Instead of loading modules separately, use the following command to load both at once:

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

Replace $SomePath with the actual path where your modules are located.

Avoid Replacing Modules: If you ever need to switch back to a previous module while still working in the script, avoid using the using module directive as a replacement command. Always combine them in the manner shown above.

Conclusion

By using a single command to load multiple PowerShell modules, you will maintain access to all desired classes, avoiding the frustrating experience of having classes removed from memory. This method ensures a smooth workflow as you develop and manage your PowerShell scripts.

Embracing this approach not only enhances your productivity but also empowers you to leverage the full potential of your modules efficiently. Happy scripting!