CODEWITHSUNDEEP
powershellpowershell-2.0
Realistic
Realistic

Reputation: 1068

Powershell: How to use select-object to get a dynamic set of properties?

I am using powershell in conjunction with sharepoint 07 to list some stuff out. I am trying to allow a (power) user to specify which Fields they want to display.
For example, I could run my code as follows:
.\psextractor -fields "Type|name|User Desc
After doing this I would get a list of files displaying the fields listed above. Currently I am using the Select-Object identifier and I was wondering if this was possible. If not, is there a way to do this without using the create-object cmdlet?
My code:

#$Args
if($Args[0] -eq "-fields" -and $Args.Count -ge 2){
    $flds = $Args[1].split("|")
}

#Later in code
 $web.Lists | foreach{
    $lib = $_
    if($lib.BaseType -eq [Microsoft.SharePoint.SPBaseType]::DocumentLibrary 
           -and $lib.BaseTemplate -eq [Microsoft.SharePoint.SPListTemplateType]::DocumentLibrary){
        $lib.Items |  Select-Object DisplayName,
                  @{n=$flds[0];e={$_.Item($flds[0])}} ,
                  @{n=$flds[1];e={$_.Item($flds[1])}}
                  #, etc, etc

    }

 }

EDIT: I used Graimer's solution below with a few tweaks

SOLUTION:

param([object[]]$flds)
$props=@() #globally declared since some of this is done in functions later

$mflds = $("Author","Created","Modified","Modified By") #mandatory fields
$mflds | foreach{
    if($flds -notcontains $_){
        $flds += $_
    }
}
#had to use regular for loop because the $_ identifier was conflicting
for ($i =0; $i -lt $flds.Count; $i++) { 
    $props += @{n=$flds[$i];e=([Scriptblock]::Create("`$_[`$flds[$i]]"))}
}
#other mandatory custom fields
    #the create method could have been used here
$props += @{n="FileName";e={"$($_.Item('Name'))"}}
$props += @{n="Url";e={"$wburl/$($_.Url)"}}

#Later in code
 $web.Lists | foreach{
    $lib = $_
    if($lib.BaseType -eq [Microsoft.SharePoint.SPBaseType]::DocumentLibrary 
           -and $lib.BaseTemplate -eq [Microsoft.SharePoint.SPListTemplateType]::DocumentLibrary){
        $lib.Items |  Select-Object -property $props

    }

 }

Upvotes: 4

Views: 11844

Answers (2)

CB.
CB.

Reputation: 60910

You can try like this:

param([object[]]$fields)

$fields += "DisplayName"

 $web.Lists | foreach{
    $lib = $_
    if($lib.BaseType -eq [Microsoft.SharePoint.SPBaseType]::DocumentLibrary 
           -and $lib.BaseTemplate -eq [Microsoft.SharePoint.SPListTemplateType]::DocumentLibrary){
        $lib.Items |  Select-Object -property $fields
    }

 }

call your function like this:

myfunction.ps1 -fields Type,name,User,Description

Upvotes: 1

Frode F.
Frode F.

Reputation: 54851

I would suggest taking in the paramters as a normal string[] (Array) parameter, and use it to create an array of hashtables (custom expressions for Select-Object). Then supply the hashtable with Select-Object. Ex:

param (
    [String[]]$Fields
)

#Create property-array for Select-Object
$props = @()

#Add mandatory displayname property
$props += @{n="DisplayName";e=([Scriptblock]::Create("`$_.DisplayName"))}

#Add user-defined fields
foreach ($field in $Fields) { 
    $props += @{n=$field;e=([Scriptblock]::Create("`$_.Item($field)"))}
}

#Later in code
$web.Lists | foreach{
    $lib = $_
    if($lib.BaseType -eq [Microsoft.SharePoint.SPBaseType]::DocumentLibrary  `
    -and $lib.BaseTemplate -eq [Microsoft.SharePoint.SPListTemplateType]::DocumentLibrary)
    {
        $lib.Items | Select-Object -Property $props
    }

 }
#Usage: .\psextractor -Fields "Type", "Name", "User", "Desc"
#This will list all fields specified after '-Fields'

Upvotes: 6

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