具有動態字段的數組

Question

我試圖根據特定條件創建具有字段的對象數組。 我有部份代碼：

$Array = @(1,2,3,4,5,6,3,4,5,7,9,0,8,9) 
$CurrentFolder = Split-Path -parent $MyInvocation.MyCommand.Definition 
$Report = @() 
foreach($Item in $Array) 
{ 
    $Obj = New-Object PSObject     

    $Obj | Add-Member -MemberType NoteProperty -Name "Item" -Value $Item    

    switch ($Item) 
    { 
     1 { $Obj | Add-Member -MemberType NoteProperty -Name "Field_1" -Value "Value_Field_1"} 
     2 { $Obj | Add-Member -MemberType NoteProperty -Name "Field_2" -Value "Value_Field_2"} 
     3 { $Obj | Add-Member -MemberType NoteProperty -Name "Field_3" -Value "Value_Field_3"} 
     4 { $Obj | Add-Member -MemberType NoteProperty -Name "Field_4" -Value "Value_Field_4"} 
     5 { $Obj | Add-Member -MemberType NoteProperty -Name "Field_5" -Value "Value_Field_5"} 
     6 { $Obj | Add-Member -MemberType NoteProperty -Name "Field_6" -Value "Value_Field_6"} 
     7 { $Obj | Add-Member -MemberType NoteProperty -Name "Field_7" -Value "Value_Field_7"} 
     8 { $Obj | Add-Member -MemberType NoteProperty -Name "Field_8" -Value "Value_Field_8"} 
     9 { $Obj | Add-Member -MemberType NoteProperty -Name "Field_9" -Value "Value_Field_9"} 
     0 { $Obj | Add-Member -MemberType NoteProperty -Name "Field_0" -Value "Value_Field_0"} 
    } 
    $Report = $Report + $Obj 
} 
$Report | ft -autosize 
#$Report | Get-member 

當我執行這個代碼，我得到的只是兩個屬性。 Item和Field_1，我得到屬性Field_1，因爲數字1是數組變量的第一項。

我想獲得一個數組，其所有屬性Field_0到Field_9及其值如果它們是空的或不是。

我試過這個使用哈希表，但我得到了同樣的結果。

Answer 1

您必須創建對象的每個屬性（不在交換機中）。然後，而不是使用一個開關，你可以訪問實際的財產，併爲其分配：

$Array = @(1,2,3,4,5,6,3,4,5,7,9,0,8,9) 
$CurrentFolder = Split-Path -parent $MyInvocation.MyCommand.Definition 
$Report = @() 
foreach($Item in $Array) 
{ 
    $Obj = New-Object PSObject     

    $Obj | Add-Member -MemberType NoteProperty -Name "Item" -Value $Item 
    $Obj | Add-Member -MemberType NoteProperty -Name "Field_1" -Value $null 
    $Obj | Add-Member -MemberType NoteProperty -Name "Field_2" -Value $null 
    $Obj | Add-Member -MemberType NoteProperty -Name "Field_3" -Value $null 
    $Obj | Add-Member -MemberType NoteProperty -Name "Field_4" -Value $null 
    $Obj | Add-Member -MemberType NoteProperty -Name "Field_5" -Value $null 
    $Obj | Add-Member -MemberType NoteProperty -Name "Field_6" -Value $null 
    $Obj | Add-Member -MemberType NoteProperty -Name "Field_7" -Value $null 
    $Obj | Add-Member -MemberType NoteProperty -Name "Field_8" -Value $null 
    $Obj | Add-Member -MemberType NoteProperty -Name "Field_9" -Value $null 
    $Obj | Add-Member -MemberType NoteProperty -Name "Field_0" -Value $null 

    $obj."Field_$Item" = $Item  

    $Report = $Report + $Obj 
} 
$Report | ft -autosize 

輸出：

Item Field_1 Field_2 Field_3 Field_4 Field_5 Field_6 Field_7 Field_8 Field_9 
---- ------- ------- ------- ------- ------- ------- ------- ------- ------- 
    1  1                 
    2   2                
    3     3              
    4       4            
    5         5          
    6           6        
    3     3              
    4       4            
    5         5          
    7             7      
    9                 9  
    0                   
    8               8    
    9                 9  

---

注意：如果您正在使用PowerShell的> 2，你也可以實現同樣的使用：

$Report = @(1,2,3,4,5,6,3,4,5,7,9,0,8,9) | ForEach-Object { 
    $Obj = [PsCustomObject]@{ 
     Item = $_ 
     Field_1 = $null 
     Field_2 = $null 
     Field_3 = $null 
     Field_4 = $null 
     Field_5 = $null 
     Field_6 = $null 
     Field_7 = $null 
     Field_8 = $null 
     Field_9 = $null 
     Field_0 = $null 
    }   

    $Obj."Field_$_" = $_ 
    $Obj 
} 
$Report | ft -autosize