How to receive an array as input object of a C# PowerShell Cmdlet

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C#

PowerShell

I'm writing a PowerShell Cmdlet in C# which should import users from the Active Directory into our Solution.
The idea is to search for AD-Users via the "Get-ADUser"-Cmdlet and use the output for our own Cmdlet. Example call:

Get-ADUser -Filter * | Select -First 5 | Add-SolutionUser

The problem is: Our cmdlet is called 5 times.
For the performance it would be much better to receive all five users in the pipeline at once.

How to do this?

The parameter of our "Add-SolutionUser" cmdlet is defined like that:

[Parameter(Position = 0, Mandatory = true, HelpMessage = "List of AD users to import.", ValueFromPipeline = true)]
[ValidateNotNullOrEmpty]
public object[] ADUserList { get; set; }

Thanks a lot.