Powershell按字母顺序对PSObject进行排序

问题描述

给出一个从json(foo.json)创建的自定义powershell对象(bar)

Given a custom powershell object (bar) that is created from json (foo.json)

您如何按键对对象进行字母排序?

How would you sort the object alphabetically by key?

foo.json
{
  "bbb": {"zebras": "fast"},
  "ccc": {},
  "aaa": {"apples": "good"}
}

所需的输出

foo.json
{
  "aaa": {"apples": "good"},
  "bbb": {"zebras": "fast"},
  "ccc": {}
}

示例

$bar = get-content -raw foo.json | ConvertFrom-Json
$bar.gettype()

IsPublic IsSerial Name                                     BaseType
-------- -------- ----                                     --------
True     False    PSCustomObject                           System.Object

我已经尝试使用排序对象

$bar = $bar | Sort
$bar = $bar | Sort-Object
Sort-Object -InputObject $bar
Sort-Object -InputObject $bar -Property Name
Sort-Object -InputObject $bar -Property @{Expression="Name"}
Sort-Object -InputObject $bar -Property @{Expression={$_.PSObject.Properties.Name}}

$bar = $bar | Sort
$bar = $bar | Sort-Object
Sort-Object -InputObject $bar
Sort-Object -InputObject $bar -Property Name
Sort-Object -InputObject $bar -Property @{Expression="Name"}
Sort-Object -InputObject $bar -Property @{Expression={$_.PSObject.Properties.Name}}

我还尝试将PSObject转换为哈希表(哈希表似乎会根据名称自动排序)，然后将该哈希表转换回json，但会再次失去顺序.

I've also tried converting the PSObject to a hashtable (hashtables appear to automatically sort based on name), then convert that hashtable back to json, but it looses the order again.

$buzz = @{}
$bar.psobject.properties |Foreach { $buzz[$_.Name] = $_.Value }
ConvertTo-Json $buzz -Depth 9

更新
更改了foo.json以包括值和键

Update
Changed foo.json to include values aswell as keys

推荐答案

如 Mathias R. Jessen 请注意，这里没有 collection 可以排序，只有一个要排序的对象其属性，因此需要通过Get-Member进行 reflection 获取对象的属性:

As Mathias R. Jessen notes, there is no collection to sort here, just a single object whose properties you want to sort, so you need reflection via Get-Member to obtain the object's properties:

$bar = get-content -raw foo.json | ConvertFrom-Json

# Build an ordered hashtable of the property-value pairs.
$sortedProps = [ordered] @{}
Get-Member -Type  NoteProperty -InputObject $bar | Sort-Object Name |
  % { $sortedProps[$_.Name] = $bar.$($_.Name) }

# Create a new object that receives the sorted properties.
$barWithSortedProperties = New-Object PSCustomObject
Add-Member -InputObject $barWithSortedProperties -NotePropertyMembers $sortedProps

使用-pv(-PipelineVariable)来缓存"由ConvertFrom-Json生成的未排序的自定义对象的更简化的版本:

A more streamlined version that uses -pv (-PipelineVariable) to "cache" the unsorted custom object produced by ConvertFrom-Json:

$barSortedProps = New-Object PSCustomObject
Get-Content -Raw foo.json | ConvertFrom-Json -pv jo |
  Get-Member -Type  NoteProperty | Sort-Object Name | % {
    Add-Member -InputObject $barSortedProps -Type NoteProperty `
               -Name $_.Name -Value $jo.$($_.Name)
  }

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