What is the Powershell syntax for adding and removing items from a TreelistEx field?

Question

I want to edit some Placeholder settings with Powershell extensions, which involves adding a specific rendering to some and removing another rendering from others.

Is there a simple syntax based on the field type, or should I just use string replacement to edit the field?

Answer 1

You can use all Sitecore types to access and manipulate field value. Example

# get your ph settings item
$phSettings = gi -path '/sitecore/layout/Placeholder Settings/content'

# read field and assign it to MultilistField type
[Sitecore.Data.Fields.MultilistField]$field = $phSettings.Fields["Allowed Controls"]

Now you can read and set values

# read IDs from an array of IDs
$field[0]

# replace ID inside an array
$phSettings.Editing.BeginEdit()
$field.Replace("{493B3A83-0FA7-4484-8FC9-4680991CF742}","{493B3A83-0FA7-4484-8FC9-4680991CF743}")
$phSettings.Editing.EndEdit()

MultilistField is an extension of Sitecore.Data.Fields.DelimitedField field type. Decompile it and see other methods available:

• public int Count
• public string[] Items
• public bool Contains(string item)
• public string Add(string item)
• public string Remove(string item)
• public int IndexOf(string item)