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The [Hashtable []] parameter, which can come from a pipeline or an argument

Here's a function that takes an array of hashtables via an argument:

function abc () {

    Param([Hashtable[]]$tables)

    $tables.count

}

Usage example:

PS C:\> abc -tables @{ a = 10 }, @{ b = 20 }, @{ c = 30 }
3

Here's the function that accepts Hashtables through the pipeline:

function bcd () {

    Param([parameter(ValueFromPipeline=$true)][Hashtable]$table)

    $input.count

}

Usage example:

PS C:\> @{ a = 10 }, @{ b = 20 }, @{ c = 30 } | bcd
3

Is there a way to define a function that can take a hashtable array through an argument, or a pipeline through the same parameter? That is, a function that can be called in both of the ways shown above. Note that I will need the entire array of hash tables in one variable (hence the use $input

above in bcd

).

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2 answers 


function bcd () {

    Param([parameter(ValueFromPipeline=$true)][Hashtable[]]$table)

    Begin {$tables= @()}
    Process {$tables += $table}
    End {$tables.count}

}

@{ a = 10 }, @{ b = 20 }, @{ c = 30 } | bcd
bcd -table @{ a = 10 }, @{ b = 20 }, @{ c = 30 }

3
3


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Here is my structure for two parameter (pipeline and cmd lines) parameters:



Function bcd () 
{
    Param(
       [parameter(ValueFromPipeline = $true)]
       [Hashtable[]]$table
    )

    Process 
    {
        ForEach ($tab in $table) 
        {  
          # do something with the table
        }
    }
}
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