Getting started with Parameter Classes

Parameter Classes enable developers to be more permissive in what input they accept and does all the input interpretation for the developer.

Implementing Parameter Classes

Parameter classes define new types as input types. In many instances, implementing them is as simple replacing the expected type on the parameter definition:

[CmdletBinding()]
param (
    [string]
    $ComputerName
)

would become

[CmdletBinding()]
param (
    [PSFComputer]
    $ComputerName
)

With this your command will correctly understand dns resolution objects, the output of Get-ADComputer, connection strings or any of a dozen other legal input types.

Additional Information

• It is possible to extend the list of legal input types.
• It is possible to teach it to understand PSCustomObjects, no need to code in C#.

Further reading

• The Computer Parameter Class
• The DateTime Parameter Class
• The TimeSpan Parameter Class