如何通过 powershell 将值和键添加到现有 JSON 文件中？

Question

我想在我现有的 JSON 文件中添加一个带值的附加键。不幸的是我做不到。这里有一个简短的概述：

我的JSON-powershell脚本之前的文件是运行:

[
  {
    "id": "1",
    "description": [
      {
        "country": "Brazil"
      },
      {
        "country": "Mexico"
      }
    ]
  },
  {
    "id": "2",
    "description": [
      {
        "country": "Argentina"
      }
    ]
  }
]

我的愿望，JSON-文件应该是什么样子，在我的 powershell 脚本是运行:

之后

[
  {
    "id": "1",
    "description": [
      {
        "country": "Brazil",
        "city": "Rio de Janeiro"
      },
      {
        "country": "Mexico",
        "city": "Mexico City"
      }
    ]
  },
  {
    "id": "2",
    "description": [
      {
        "country": "Argentina",
        "city": "Buenos Aires"
      }
    ]
  }
]

我的 powershell 脚本：

function GetCity($country) {
    $x = "not available"                
    If ( $country -eq "Brazil" ) { $x = "Rio de Janeiro" }
    If ( $country -eq "Mexico" ) { $x = "Mexico City" }
    If ( $country -eq "Argentina" ) { $x = "Buenos Aires" }    
    return $x    
}

# Source the JSON content
$jsonFile = 'C:\Temp\test.json'
$jsonContent  = Get-Content -Path $jsonFile

# Convert JSON to PSObjects
$jsonAsPsObjects = $jsonContent | ConvertFrom-Json

foreach ($info in $jsonAsPsObjects) {
    $result = GetCity($info.description.country)
    jsonContent | Add-Member -Type NoteProperty -Name "City" -Value $result
}

# Save JSON back to file
$json | ConvertTo-Json | Set-Content $jsonFile

错误：

jsonContent : The term 'jsonContent' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again.

我该如何解决这个问题？

Answer 1

有两个问题：

jsonContent 在语句 jsonContent | Add-Member ...
中应该是 $jsonContent
你忽略了遍历 description 属性的数组元素到 each 其中一个 city 属性待补充

我建议按如下方式简化您的代码：

function Get-City {
  param([string] $country)
  # Use a `switch` statement:
  switch ($country) {
    'Brazil' { return 'Rio de Janeiro' }
    'Mexico' { return 'Mexico City' }
    'Argentina' { return 'Buenos Aires' }
    default { return 'not available' }
  }
}

$jsonFile = 'C:\Temp\test.json'

(Get-Content -Raw $jsonFile | ConvertFrom-Json) | ForEach-Object {
  # Add a 'city' property to each object in the 'description' property.
  $_.description.ForEach({ 
    Add-Member -InputObject $_ city (Get-City $_.country) 
  })
  $_  # output the modified object
} | ConvertTo-Json -Depth 3  # | Set-Content $jsonFile

如何通过 powershell 将值和键添加到现有 JSON 文件中？

How to add a value and key into existing JSON file over powershell?

powershell

json

powershell-5.0