Library.cs

using System.Management.Automation;

namespace MyPSModule
{
    [Cmdlet("Get", "Foo")]
    public class GetFooCommand : PSCmdlet
    {
        [Parameter]
        public string Name { get; set; } = string.Empty;

        protected override void EndProcessing()
        {
            this.WriteObject("Foo is " + this.Name);
            base.EndProcessing();
        }
    }
}