PowerShell Define Common Parameters to be Used Across Multiple Functions

GenerateParameters.ps1

# Define Parameters in the following ArrayList
# and pass to GenerateParameters

# Note: does not support more advanced features like param sets and validations
# ...yet

$def = @(
    @{
        "Name"="Name";
        "Type"=[String];
        "Properties"=@(
            @{
                "Mandatory"=$true;
                "Position"=0;
            }
        )
    },@{
        "Name"="Credential";
        "Type"=[PSCredential]
        "Properties"=@(
            @{
                "Mandatory"=$true;
                "Position"=1;
            }
        )
    }
)


function GenerateParameters($definition)
{
    $params = New-Object -Type System.Management.Automation.RuntimeDefinedParameterDictionary
    $definition | %{
        $attrs = New-Object -Type System.Collections.ObjectModel.Collection[System.Attribute]
        $_.Properties | %{
            $attr = New-Object -Type Parameter
            $props = $_
            $_.Keys | %{
                $attr.($_) = $props.Item($_)
            }
            $attrs.Add($attr)
        }
        $params.Add(
            $_.Name,
            (New-Object -Type System.Management.Automation.RuntimeDefinedParameter(
                $_.Name,
                $_.Type,
                $attrs
            ))
        )
    }
    return $params
}

# The following functions will have matching parameters

function TestCmd
{
    [CmdletBinding()]
    param()
    DynamicParam{
        GenerateParameters($def)
    }
}

function TestCmdOther
{
    [CmdletBinding()]
    param()
    DynamicParam{
        GenerateParameters($def)
    }
}