Declare get accessors in PowerShell cmdlet options

Question

According to MSDN :

"Parameters must be declared in public non-static fields or properties. Parameters must be declared by properties. The property must have a public accessory, and if ValueFromPipeline or the keyword ValueFromPipelineByPropertyName is specified, the property must have public access to accessories."

Why do I need to declare get accessors in cmdlet parameters ValueFromPipeline? As far as I know, PowerShell only needs to insert its values, and not read them. Thanks (by the way, they are just curious about this behavior :)).

Answer 1

PowerShell , ValueFromPipeline ValueFromPipelineByPropertyName, , .

:

New-Post -Title <string>
Set-Post -InputObject <Post> -Title <string>

:

• New-Post Post , Title
• InputObject Set-Post ValueFromPipeline = true
• Title Set-Post ValueFromPipelineByPropertyName = true.

:

New-Post -Title "Foo" | Set-Post

get accessor Set-Post cmdlet Title :

, CmdletParameterBinderController.GetDefaultParameterValue Title Set-Post , .