嵌套数组和ConvertTo-Json [英] Nested arrays and ConvertTo-Json

问题描述

要使用REST API，我必须传递一个如下所示的JSON对象:

To use a REST API, I must pass a JSON object that looks like this:

{ "series" : 
  [{  
      "metric": "custom.powershell.gauge",
      "points":[[1434684739, 1000]]
    }
  ]
}

请注意此处的嵌套数组.我无法重现这一点.这是我的代码:

Note the nested array here. I cannot get to reproduce this. Here is my code:

[int][double]$unixtime=get-date ( (get-date).ToUniversalTime() ) -UFormat %s
$obj=@{}
$series=@{}
$array=@()
$points=@()
$value=get-random -Minimum 0 -Maximum 100


$series.add("metric","custom.powershell.gauge")
$points=@(@($unixtime, $value))
$series.add("points",$points)
$obj.Add("series",@($series))

$json=$obj | ConvertTo-Json -Depth 30 -Compress
$json

这是输出:

{"series":[{"points":[1434685292,95],"metric":"custom.powershell.gauge"}]}

我尝试了很多事情，我无法嵌套两个数组，它总是看起来像一个数组.

I've tried many things, I cannot get the 2 arrays to be nested, it always end up looking like a single array.

在同一张纸上，有人请对此进行解释:

On the same note, came someone explain this please:

> $a=(1,2)
> $a
1
2
> $a | ConvertTo-Json
[
    1,
    2
]
> $b=($a,$a)
> $b
1
2
1
2
> $b | ConvertTo-Json
[
    {
        "value":  [
                      1,
                      2
                  ],
        "Count":  2
    },
    {
        "value":  [
                      1,
                      2
                  ],
        "Count":  2
    }
]

这些value和Count来自哪里?

感谢您的帮助.

推荐答案

解释是(1,2),(3,4)是一个数组数组，但是Powershell用管道|分割了第一级，您没有给出这些阵列的名称，以便串行器提供.首先尝试一下:

The explanation is that (1,2),(3,4) is an array of array, but Powershell split the first level with the pipe |, and you don't give a name for these arrays so the serializer supplies it. First have a try to this :

# First build your array of array
$z = (1,2),(3,4)
# convert it to JSON using the ,
,$z | ConvertTo-Json -Depth 5 -Compress
[psobject]@{"points"=$z} | ConvertTo-Json -Depth 5 -Compress

它给出了第一步:

{"value":[[1,2],[3,4]],"Count":2}
{"points":[[1,2],[3,4]]}

现在我提出的解决方案:

# First build your array of array
$z = (1,2),(3,4)

# Then build a PSCustom object
$a = [pscustomobject]@{"series" = ,@{"metric"="custom.powershell.gauge"; "points"=$z}}

# At the end convert it to JSON
# don't forget the **Depth** parameter (use **Compress** to retreive one line like above)
$a | ConvertTo-Json -Depth 5

对我来说，它可以满足您的需求:

For me it gives something close to what you need:

{
    "series":  [
                   {
                       "points":  [
                                      [
                                          1,
                                          2
                                      ],
                                      [
                                          3,
                                          4
                                      ]
                                  ],
                       "metric":  "custom.powershell.gauge"
                   }
               ]
}

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