从 JSON 创建哈希表
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Create Hashtable from JSON
提问by Marc
I want to get a JSON representation of a Hashtable such as this:
我想获得 Hashtable 的 JSON 表示，例如：
@{Path="C:\temp"; Filter="*.js"}
ConvertTo-Jsonresults in:
ConvertTo-Json结果是：
{
"Path": "C:\temp",
"Filter": "*.js"
}
However, if you convert that JSON string back with ConvertFrom-Jsonyou don't get a HashTable but a PSCustomObject.
但是，如果您将该 JSON 字符串转换回来，ConvertFrom-Json您将不会得到 HashTable 而是 PSCustomObject。
So how can one reliably serialize the above Hashmap?
那么如何可靠地序列化上述 Hashmap 呢？
回答by sodawillow
$json = @{Path="C:\temp"; Filter="*.js"} | ConvertTo-Json
$hashtable = @{}
(ConvertFrom-Json $json).psobject.properties | Foreach { $hashtable[$_.Name] = $_.Value }
Adapted from PSCustomObject to Hashtable
回答by wOxxOm
JavaScriptSerializeris available since .NET3.5 (may be installed on XP, included in Win7 and newer), it's several times faster than Convert-FromJSON and it properly parses nested objects, arrays etc.
JavaScriptSerializer从 .NET3.5 开始可用（可能安装在 XP 上，包含在 Win7 和更新版本中），它比 Convert-FromJSON 快几倍，并且可以正确解析嵌套对象、数组等。
function Parse-JsonFile([string]$file) {
$text = [IO.File]::ReadAllText($file)
$parser = New-Object Web.Script.Serialization.JavaScriptSerializer
$parser.MaxJsonLength = $text.length
Write-Output -NoEnumerate $parser.DeserializeObject($text)
}
回答by ThePoShWolf
A little late to the discussion here, but in PowerShell 6 (Core) there is a -AsHashtableparameter in ConvertFrom-Json.
这里的讨论有点晚了，但在 PowerShell 6（核心）中有一个ConvertFrom-Json-AsHashtable参数。
回答by Esten Rye
The answer for this post is a great start, but is a bit naive when you start getting more complex json representations.
这篇文章的答案是一个很好的开始，但是当您开始获得更复杂的 json 表示时有点天真。
The code below will parse nested json arrays and json objects.
下面的代码将解析嵌套的 json 数组和 json 对象。
[CmdletBinding]
function Get-FromJson
{
param(
[Parameter(Mandatory=$true, Position=1)]
[string]$Path
)
function Get-Value {
param( $value )
$result = $null
if ( $value -is [System.Management.Automation.PSCustomObject] )
{
Write-Verbose "Get-Value: value is PSCustomObject"
$result = @{}
$value.psobject.properties | ForEach-Object {
$result[$_.Name] = Get-Value -value $_.Value
}
}
elseif ($value -is [System.Object[]])
{
$list = New-Object System.Collections.ArrayList
Write-Verbose "Get-Value: value is Array"
$value | ForEach-Object {
$list.Add((Get-Value -value $_)) | Out-Null
}
$result = $list
}
else
{
Write-Verbose "Get-Value: value is type: $($value.GetType())"
$result = $value
}
return $result
}
if (Test-Path $Path)
{
$json = Get-Content $Path -Raw
}
else
{
$json = '{}'
}
$hashtable = Get-Value -value (ConvertFrom-Json $json)
return $hashtable
}
回答by Gonzalo Contento
I believe the solution presented in Converting JSON to a hashtableis closer to the PowerShell 6.0 implementation of ConvertFrom-Json
我相信Converting JSON to a hashtable 中提出的解决方案更接近ConvertFrom-Json的 PowerShell 6.0 实现
I tried with several JSON sources and I always got the right hashtable.
我尝试了几个 JSON 源，我总是得到正确的哈希表。
$mappings = @{
Letters = (
"A",
"B")
Numbers = (
"1",
"2",
"3")
Yes = 1
False = "0"
}
# TO JSON
$jsonMappings = $mappings | ConvertTo-JSON
$jsonMappings
# Back to hashtable
# In PowerShell 6.0 would be:
# | ConvertFrom-Json -AsHashtable
$jsonMappings | ConvertFrom-Json -As hashtable
回答by Hu Xinlong
you can write a function convert psobject to hashtable.
您可以编写一个函数将 psobject 转换为哈希表。
I wrote a answer here:enter link description here
我在这里写了一个答案：在此处输入链接描述
