如何在PowerShell中正确合并多个JSON文件？含多对象场景解决

需求说明 #

需要将两个JSON文件合并为一个，具体文件内容如下：

start.json内容 #

{
    "MOUSE GESTURE L Start": {
        "prefix": "MOUSE GESTURE L Start To Start",
        "body": [
    "MG_Start()"
        ],
        "description": "Start Cursor back to its start"
    }
}

end.json内容 #

{
    "MOUSE GESTURE L Move To end": {
        "prefix": "MOUSE GESTURE L Move To end",
        "body": [
    "MG_Move()"
        ],
        "description": "Move Cursor back to its end"
    }
}

期望输出 #

{
    "MOUSE GESTURE L Start": {
        "prefix": "MOUSE GESTURE L Start To Start",
        "body": [
    "MG_Start()"
        ],
        "description": "Start Cursor back to its start"
    },
    "MOUSE GESTURE L Move To end": {
        "prefix": "MOUSE GESTURE L Move To end",
        "body": [
    "MG_Move()"
        ],
        "description": "Move Cursor back to its end"
    }   
}

尝试的代码及异常输出 #

使用以下PowerShell代码尝试合并：

$Jstart = (Get-Content .\start.json -Raw) | ConvertFrom-Json
$JEnd = (Get-Content .\end.json -Raw) | ConvertFrom-Json

$Hash = [PSCustomObject]@{
    $Jstart = (Get-Content .\start.json -Raw) | ConvertFrom-Json
    $JEnd = (Get-Content .\end.json -Raw) | ConvertFrom-Json
}

得到不符合预期的输出：

{
  "@{MOUSE GESTURE L Start=}": {
    "MOUSE GESTURE L Start": {
      "prefix": "MOUSE GESTURE L Start To Start",
      "body": "MG_Start()",
      "description": "Start Cursor back to its start"
    }
  },
  "@{MOUSE GESTURE L Move To end=}": {
    "MOUSE GESTURE L Move To end": {
      "prefix": "MOUSE GESTURE L Move To end",
      "body": "MG_Move()",
      "description": "Move Cursor back to its end"
    }
  }
}

补充问题：多对象JSON文件适配失败 #

当其中一个JSON文件包含多个对象时（如下方示例），使用代码$left.PSObject.Properties.Add($($right.PSObject.Properties))会报错：

多对象JSON示例 #

{
    "MOUSE GESTURE L Move To end": {
        "prefix": "MOUSE GESTURE L Move To end",
        "body": [
    "MG_Move()"
        ],
        "description": "Move Cursor back to its end"
    },

    "Another Snippet": {
        "prefix": "MOUSE GESTURE L Move To end",
        "body": [
    "MG_Move()"
        ],
        "description": "Move Cursor back to its end"
    }
}

报错信息 #

MethodException: 
Cannot find an overload for "Add" and the argument count: "1".

解决方案 #

基础版（单对象JSON文件合并） #

直接将两个JSON对象的属性合并到同一个自定义对象中：

# 读取并转换JSON文件
$startObj = Get-Content .\start.json -Raw | ConvertFrom-Json
$endObj = Get-Content .\end.json -Raw | ConvertFrom-Json

# 将endObj的属性添加到startObj中
foreach ($prop in $endObj.PSObject.Properties) {
    $startObj | Add-Member -MemberType NoteProperty -Name $prop.Name -Value $prop.Value
}

# 输出合并后的JSON
$startObj | ConvertTo-Json -Depth 10

进阶版（支持多对象JSON文件合并） #

当其中一个文件包含多个属性时，需要遍历每个属性逐个添加，而不是批量传递属性集合：

$left = Get-Content .\start.json -Raw | ConvertFrom-Json
$right = Get-Content .\end.json -Raw | ConvertFrom-Json

# 遍历右侧对象的所有属性，逐个添加到左侧对象
foreach ($prop in $right.PSObject.Properties) {
    $left.PSObject.Properties.Add($prop)
}

# 转换为JSON输出
$left | ConvertTo-Json -Depth 10

注：使用ConvertTo-Json时建议指定足够的-Depth值，避免嵌套内容被截断。

内容的提问来源于stack exchange，提问作者hellen_dorandt89