我有一个包含以下代码的脚本文件 它运行相同的代码3次。
源代码：
Clear-Host
$myKeys = @('key1','key2','key3','key4','key5')
$myValues = @('one','two','three','four','five')
# Declare function
Function Invoke-MyArray
{
[CmdletBinding()] param ()
Write-Output "Function: $($MyInvocation.Mycommand)"
$myLocalArray = @()
foreach ($element in $myKeys)
{
$key = $element
$val = $myValues[$myKeys.IndexOf($key)]
$myObject = New-Object -TypeName PSObject -Property @{
key = $key
val = $val
}
$myLocalArray += $myObject
}
Write-Output '### 1 ### $myArray'
Write-Output '------------------'
$myArray
Write-Output '### 2 ### $myArray.getType()'
Write-Output '----------------------------'
$myArray.getType()
Write-Output '### 3 ### $myArray.getType() | Out-String'
Write-Output '-----------------------------------------'
$myArray.getType() | Out-String
Write-Output '### 4 ### $myArray[0]'
Write-Output '---------------------'
$myArray[0]
Write-Output '### 5 ### $myArray[0].getType()'
Write-Output '-------------------------------'
$myArray[0].getType()
Write-Output '### 6 ### $myArray[0].getType() | Out-String'
Write-Output '--------------------------------------------'
$myArray[0].getType() | Out-String
}
# Call function
Write-Output '====================='
Write-Output '=== Call function ==='
Write-Output '====================='
Invoke-MyArray
Write-Output '==============================================='
Write-Output '=== Execute same code, without the function ==='
Write-Output '==============================================='
# Execute same code, without the function
$myArray = @()
foreach ($element in $myKeys)
{
$key = $element
$val = $myValues[$myKeys.IndexOf($key)]
$myObject = New-Object -TypeName PSObject -Property @{
key = $key
val = $val
}
$myArray += $myObject
}
Write-Output '### 1 ### $myArray'
Write-Output '------------------'
$myArray
Write-Output '### 2 ### $myArray.getType()'
Write-Output '----------------------------'
$myArray.getType()
Write-Output '### 3 ### $myArray.getType() | Out-String'
Write-Output '-----------------------------------------'
$myArray.getType() | Out-String
Write-Output '### 4 ### $myArray[0]'
Write-Output '---------------------'
$myArray[0]
Write-Output '### 5 ### $myArray[0].getType()'
Write-Output '-------------------------------'
$myArray[0].getType()
Write-Output '### 6 ### $myArray[0].getType() | Out-String'
Write-Output '--------------------------------------------'
$myArray[0].getType() | Out-String
Write-Output '===================================='
Write-Output '=== Executed on the command line ==='
Write-Output '===================================='
结果输出：
=====================
=== Call function ===
=====================
Function: Invoke-MyArray
### 1 ### $myArray
------------------
key val
--- ---
key1 one
key2 two
key3 three
key4 four
key5 five
### 2 ### $myArray.getType()
----------------------------
### 3 ### $myArray.getType() | Out-String
-----------------------------------------
IsPublic IsSerial Name BaseType
-------- -------- ---- --------
True True Object[] System.Array
### 4 ### $myArray[0]
---------------------
key1 one
### 5 ### $myArray[0].getType()
-------------------------------
### 6 ### $myArray[0].getType() | Out-String
--------------------------------------------
IsPublic IsSerial Name BaseType
-------- -------- ---- --------
True False PSCustomObject System.Object
===============================================
=== Execute same code, without the function ===
===============================================
### 1 ### $myArray
------------------
key1 one
key2 two
key3 three
key4 four
key5 five
### 2 ### $myArray.getType()
----------------------------
### 3 ### $myArray.getType() | Out-String
-----------------------------------------
IsPublic IsSerial Name BaseType
-------- -------- ---- --------
True True Object[] System.Array
### 4 ### $myArray[0]
---------------------
key1 one
### 5 ### $myArray[0].getType()
-------------------------------
### 6 ### $myArray[0].getType() | Out-String
--------------------------------------------
IsPublic IsSerial Name BaseType
-------- -------- ---- --------
True False PSCustomObject System.Object
====================================
=== Executed on the command line ===
====================================
PS C:\> Write-Output '### 1 ### $myArray'
Write-Output '------------------'
### 1 ### $myArray
------------------
PS C:\> $myArray
key val
--- ---
key1 one
key2 two
key3 three
key4 four
key5 five
PS C:\> Write-Output '### 2 ### $myArray.getType()'
Write-Output '----------------------------'
### 2 ### $myArray.getType()
----------------------------
PS C:\> $myArray.getType()
IsPublic IsSerial Name BaseType
-------- -------- ---- --------
True True Object[] System.Array
PS C:\> Write-Output '### 3 ### $myArray.getType() | Out-String'
Write-Output '-----------------------------------------'
### 3 ### $myArray.getType() | Out-String
-----------------------------------------
PS C:\> $myArray.getType() | Out-String
IsPublic IsSerial Name BaseType
-------- -------- ---- --------
True True Object[] System.Array
PS C:\> Write-Output '### 4 ### $myArray[0]'
Write-Output '---------------------'
### 4 ### $myArray[0]
---------------------
PS C:\> $myArray[0]
key val
--- ---
key1 one
PS C:\> Write-Output '### 5 ### $myArray[0].getType()'
Write-Output '-------------------------------'
### 5 ### $myArray[0].getType()
-------------------------------
PS C:\> $myArray[0].getType()
IsPublic IsSerial Name BaseType
-------- -------- ---- --------
True False PSCustomObject System.Object
PS C:\> Write-Output '### 6 ### $myArray[0].getType() | Out-String'
Write-Output '--------------------------------------------'
### 6 ### $myArray[0].getType() | Out-String
--------------------------------------------
PS C:\> $myArray[0].getType() | Out-String
IsPublic IsSerial Name BaseType
-------- -------- ---- --------
True False PSCustomObject System.Object
PS C:\>
请注意，.getType()调用始终为空（无结果），除非直接从命令行调用。
仅当.getType()通过管道传递给Out-String时，我们才会在脚本内部看到打印结果。
为什么我不能仅使用.getType()在我的脚本和/或函数中获得输出？
编辑（在被Ansgar Wiechers标记为重复之后）：
duplicate包含link到MSDN文章，其中声明：
现在，如果没有数据类型的注册视图，那么 Out-Default查看STREAM中的第一个对象以确定如何 对象具有5个或更多属性的许多属性，它发送 整个STREAM到格式列表，否则它发送整个STREAM 格式表。当它将流发送到Format-Table时，该命令 需要生成列。 通过查看属性来实现此目的 第一个对象 - 那些成为专栏。如果是第一个Object 有2个属性，你将得到一个2列表，即使所有其他 流中的对象有10个属性。
$myArray是一个包含2个属性的对象的数组
所以，我希望在输出流中得到一个2列的表
相反，我根本没有输出
从这个意义上说，这不是一个重复的问题，但肯定是相关的。