如何在PowerShell PSDrive“函数：”上向函数对象添加属性？

我试过使用$ function：foo值和get-item函数：foo . 所有尝试都成功修改了临时函数对象，但在重新分配给存储函数时（通过$ function：foo = ...或set-item function：foo ...），缺少附加属性 .

以下是我尝试的结果（全部失败）：

Build

$=>function foo { "foo" }
$=>$f = $function:foo
$=>$f = $f | add-member noteproperty bar BARvalue -pass
$=>$f | gm b*

   TypeName: System.Management.Automation.ScriptBlock

Name                 MemberType   Definition
----                 ----------   ----------
bar                  NoteProperty System.String bar=BARvalue

＃1

$=>set-item function:f  $f -force
$=>$function:foo | gm b*
>

＃2

$=>$function:f = $f
$=>$function:foo | gm b*
>

＃3

$=>$f = get-item function:foo
$=>$f | gm

   TypeName: System.Management.Automation.FunctionInfo

Name                MemberType   Definition
----                ----------   ----------
Equals              Method       System.Boolean Equals(Object obj)
GetHashCode         Method       System.Int32 GetHashCode()
GetType             Method       System.Type GetType()
ToString            Method       System.String ToString()
PSDrive             NoteProperty System.Management.Automation.PSDriveInfo PSDrive=Function
PSIsContainer       NoteProperty System.Boolean PSIsContainer=False
PSPath              NoteProperty System.String PSPath=Microsoft.PowerShell.Core\Function::foo
PSProvider          NoteProperty System.Management.Automation.ProviderInfo PSProvider=Microsoft....
CmdletBinding       Property     System.Boolean CmdletBinding {get;}
CommandType         Property     System.Management.Automation.CommandTypes CommandType {get;}
DefaultParameterSet Property     System.String DefaultParameterSet {get;}
Definition          Property     System.String Definition {get;}
Description         Property     System.String Description {get;set;}
Module              Property     System.Management.Automation.PSModuleInfo Module {get;}
ModuleName          Property     System.String ModuleName {get;}
Name                Property     System.String Name {get;}
Options             Property     System.Management.Automation.ScopedItemOptions Options {get;set;}
Parameters          Property     System.Collections.Generic.Dictionary`2[[System.String, mscorli...
ParameterSets       Property     System.Collections.ObjectModel.ReadOnlyCollection`1[[System.Man...
ScriptBlock         Property     System.Management.Automation.ScriptBlock ScriptBlock {get;}
Visibility          Property     System.Management.Automation.SessionStateEntryVisibility Visibi...

$=>$f = $f | add-member noteproperty bar barValue -pass
$=>$f | gm b*

   TypeName: System.Management.Automation.FunctionInfo

Name                MemberType   Definition
----                ----------   ----------
bar                 NoteProperty System.String bar=barValue

$=>set-item function:foo $f
$=>$function:foo | gm b*
>

不知道我做错了什么 . 看来这些属性在重新分配时被剥离了 . 那是对的吗？定义的行为？我没有看到任何文档说FunctionInfo对象或ScriptBlocks被异常处理 . 这是语言的一些深奥的角落吗？