Book Image

Mastering PowerShell Scripting - Fourth Edition

By : Chris Dent
5 (1)
Book Image

Mastering PowerShell Scripting - Fourth Edition

5 (1)
By: Chris Dent

Overview of this book

PowerShell scripts offer a convenient way to automate various tasks, but working with them can be daunting. Mastering PowerShell Scripting takes away the fear and helps you navigate through PowerShell's capabilities.This extensively revised edition includes new chapters on debugging and troubleshooting and creating GUIs (online chapter). Learn the new features of PowerShell 7.1 by working with parameters, objects, and .NET classes from within PowerShell 7.1. This comprehensive guide starts with the basics before moving on to advanced topics, including asynchronous processing, desired state configuration, using more complex scripts and filters, debugging issues, and error-handling techniques. Explore how to efficiently manage substantial amounts of data and interact with other services using PowerShell 7.1. This book will help you to make the most of PowerShell's automation features, using different methods to parse data, manipulate regular expressions, and work with Windows Management Instrumentation (WMI).
Table of Contents (26 chapters)
24
Other Books You May Enjoy
25
Index

Classes for parameters

PowerShell includes several attributes that you can use on parameters. Each of these classes inherits from another .NET type. The classes include:

  • Argument transformation attributes
  • Validation attributes
  • Classes for use with ValidateSet

You can implement each of these using classes in PowerShell.

Argument transformation attributes are used to test and potentially change the value being assigned to a variable before the assignment completes.

Argument-transformation attribute classes

An argument-transformation attribute is used to convert the value of an argument for a variable. The transformation operation is carried out before PowerShell completes the assignment to the variable, giving the opportunity to avoid type mismatch errors.

You can add argument-transformation attributes to any variable, including parameters in functions and scripts and properties in classes.

Classes for argument transformation must...