如何获得只有填充值的属性？

Question

如何获得只有填充值的属性？

因此，举例来说，如果我跑

Get-QADUser -Identity "SomeOne" -IncludeAllProperties 

过程的输出将包括..所有的属性，包括那些和那些没有价值。我想要一个只有值的属性列表。一般来说如何做？

这不会仅限于Quest Cmdlet，我仅以Get-QADUser为例。

Answer 1

你可以尝试使用PowerShell中的内置（隐藏）属性的对象称为PSObject，其中包括一个名为属性财产，即一个父对象上的所有属性的列表。

可能更容易一个例子。以Get-Process ...一个进程可以有许多属性（属性），有或没有值。为了与价值观得到只是那些你这样做：

(Get-Process | Select -First 1).PSObject.Properties | ?{$_.Value -ne $null} | FT Name,Value 

注意，我限于这只是Get-Process返回的第一个过程。然后，我们获取在该对象上定义的所有属性，筛选其中值不为空，然后显示名称和值对于这些属性。

Answer 2

你第一次得到它的属性（因为Get-QADUser取决于AD架构，属性列表是动态的）与get-member -type property，然后过滤掉那些没有\{.*(get).*\}在其定义（即，它们不是“gettable”） ，然后按名称枚举结果列表并过滤出空值。

$someone=Get-QADUser -Identity "SomeOne" -IncludeAllProperties 
$members=$someone|get-member -type property| where {$_.definition -match '\{.*(get).*\}'} 
foreach ($member in $members) { 
    if ($someone[$member.name] -ne $null) { 
     write-host $member.name $someone[$member.name] 
    } 
} 

Answer 3

要补Charlie Joynt's helpful answer：

下面是便利功能Remove-NullProperties，它创建定制对象副本的其输入对象填充的仅与输入对象的非$null性质。

实施例使用：

# Sample input collection, with 2 objects with different $null-valued 
# properties. 
$coll = [pscustomobject] @{ one = 'r1c1'; two = $null; three = 'r1c3' }, 
     [pscustomobject] @{ one = 'r2c1'; two = 'r2c2'; three = $null } 

# Output copies containing only non-$null-valued properties. 
# NOTE: The `ForEach-Object { Out-String -InputObject $_ }` part is solely 
#  there to ensure that *all* resulting properties are shown. 
#  With the default output, only the properties found on the FIRST 
#  input object would be used in the output table. 
$coll | Remove-NullProperties | 
    ForEach-Object { Out-String -InputObject $_ } 

这产生以下 - 注意如何各个空值属性中除去：

one three 
--- ----- 
r1c1 r1c3 


one two 
--- --- 
r2c1 r2c2 

---

Remove-NullProperties源代码：

<# 
.SYNOPSIS 
Removes properties with $null values from custom-object copies of 
the input objects. 

.DESCRIPTION 
Note that output objects are custom objects that are copies of the input 
objects with copies of only those input-object properties that are not $null. 

CAVEAT: If you pipe multiple objects to this function, and these objects 
     differ in what properties are non-$null-valued, the default output 
     format will show only the non-$null-valued properties of the FIRST object. 
     Use ... | ForEach-Object { Out-String -InputObject $_ } to avoid 
     this problem. 

.NOTES 
Since the output objects are generally of a distinct type - [pscustomobject] - 
and have only NoteProperty members, use of this function only makes sense 
with plain-old data objects as input. 

.EXAMPLE 
> [pscustomobject] @{ one = 1; two = $null; three = 3 } | Remove-NullProperties 

one three 
--- ----- 
    1  3 

#> 
function Remove-NullProperties { 

    param(
    [parameter(Mandatory,ValueFromPipeline)] 
    [psobject] $InputObject 
) 

    process { 
    # Create the initially empty output object 
    $obj = [pscustomobject]::new() 
    # Loop over all input-object properties. 
    foreach($prop in $InputObject.psobject.properties) { 
     # If a property is non-$null, add it to the output object. 
     if ($null -ne $InputObject.$($prop.Name)) { 
     Add-Member -InputObject $obj -NotePropertyName $prop.Name -NotePropertyValue $prop.Value 
     } 
    } 
    # Give the output object a type name that reflects the type of the input 
    # object prefixed with 'NonNull.' - note that this is purely informational, unless 
    # you define a custom output format for this type name. 
    $obj.pstypenames.Insert(0, 'NonNull.' + $InputObject.GetType().FullName) 
    # Output the output object. 
    $obj 
    } 

} 

Answer 4

从Infoblox csv文件导入对象时，这些答案对我无效。有些值是空字符串，但不是空值。测试一个属性是否为真，似乎对我更好。结果是一个对象。

$a = [pscustomobject]@{one='hi';two='';three='there'} 
$prop = $a.psobject.Properties | where value | select -expand name 
$a | select $prop 

one three 
--- ----- 
hi there