Powershell 中自定义对象的范围

Question

所以我有一个 powershell 问题，看起来应该很容易解决，但我自己却很难解决。

以下面的程序为例：

$MyFavoriteAnimals = @()
$Pets = "Cat","Dog","Fish","Bird"
$Names = "Jeb","Rex","Sam","Roger"

For ($i=0; $i -lt 4; $i++)
{
    $NewAnimal = @{"Kind" = $Pets[$i]; "Name" = $Names[$i]}
    $MyFavoriteAnimals += New-Object pscustomobject -Property $NewAnimal
}
$MyFavoriteAnimals | FT Kind, Name -AutoSize

这工作正常，并有以下输出：

Kind Name 
---- ---- 
Cat  Jeb  
Dog  Rex  
Fish Sam  
Bird Roger

...但是如果我尝试将其放入函数中并将 $MyFavoriteAnimals 范围作为全局变量，则 New-Object 命令将停止工作：

Function My-Favorite-Animals {

    $Global:MyFavoriteAnimals = @()

    $Pets = "Cat","Dog","Fish","Bird"
    $Names = "Jeb","Rex","Sam","Roger"

    For ($i=0; $i -lt 4; $i++)
    {
        $NewAnimal = @{"Kind" = $Pets[$i]; "Name" = $Names[$i]}
        $MyFavoriteAnimals += New-Object pscustomobject -Property $NewAnimal
    }

}

My-Favorite-Animals
$MyFavoriteAnimals | FT Kind, Name -AutoSize

...我收到以下错误：

Method invocation failed because [System.Management.Automation.PSObject]     does not contain a method named 'op_Addition'.
At line:13 char:9
+         $MyFavoriteAnimals += New-Object pscustomobject -Property $NewAnimal
+         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo          : InvalidOperation: (op_Addition:String) [], RuntimeException
+ FullyQualifiedErrorId : MethodNotFound

Answer 1

指定：**$Global:**MyFavoriteAnimals +=，如：

Function My-Favorite-Animals {

    $Global:MyFavoriteAnimals = @()

    $Pets = "Cat","Dog","Fish","Bird"
    $Names = "Jeb","Rex","Sam","Roger"

    For ($i=0; $i -lt 4; $i++)
    {
        $NewAnimal = @{"Kind" = $Pets[$i]; "Name" = $Names[$i]}
        $Global:MyFavoriteAnimals += New-Object pscustomobject -Property $NewAnimal
    }

}

My-Favorite-Animals
$MyFavoriteAnimals | FT Kind, Name -AutoSize

Powershell 中自定义对象的范围

Scoping Custom Objects in Powershell

powershell

pscustomobject