Powershell 分组在不同版本中的行为不同

Question

问题：我该如何写才能在 v4 和 v5 中给出相同的结果？

我正在尝试按 SiteCode 对以下数据集进行分组。

我有一个数据集如下[哈希数组]:

假设 AppointmentId 总是唯一的

$groupedDataset = @{}

$dataset = @(
    @{
        Program          = "x"
        AppointmentId    = "1234567891"
        AdminDate        = "x"
        CountryName      = "x"
        SiteCode         = "x1111"
        DateRequested    = "x"
        SubjectID        = "x"
        AccountID        = "x"  
    },
    @{
        Program          = "x"
        AppointmentId    = "1234567892"
        AdminDate        = "x"
        CountryName      = "x"
        SiteCode         = "x1112"
        DateRequested    = "x"
        SubjectID        = "x"
        AccountID        = "x"  
    },
    @{
        Program          = "x"
        AppointmentId    = "1234567893"
        AdminDate        = "x"
        CountryName      = "x"
        SiteCode         = "x1113"
        DateRequested    = "x"
        SubjectID        = "x"
        AccountID        = "x"  
    },
    @{
        Program          = "x"
        AppointmentId    = "1234567894"
        AdminDate        = "x"
        CountryName      = "x"
        SiteCode         = "x1111"
        DateRequested    = "x"
        SubjectID        = "x"
        AccountID        = "x"  
    }
)

当我运行下面的代码在PS Version: 5.1

$dataset |
    ForEach-Object { [PSCustomObject]$_ } |
    Group-Object -Property SiteCode |
    ForEach-Object {
        $groupedDataset[$_.Name] = $_.Group
    }

它returns我要求的结果：

Name                           Value                                           
----                           -----                                           
x1113                        {@{SiteCode=x1113; Program=x; Appointment...
x1111                        {@{SiteCode=x1111; Program=x; Appointment...
x1112                        {@{SiteCode=x1112; Program=x; Appointment...

当我运行 PS Version: 4.0 中的精确代码时，它 returns 以下内容：

Name                           Value                                           
----                           -----                                           
                               {System.Collections.Hashtable, System.Collect...

Answer 1

在 PowerShell v5.0 中进行了改进，例如。 PSCustomObject 转换，在您的脚本中

ForEach-Object { [PSCustomObject]$_ }

尝试用老派的方法来做，不要自己构建哈希表，而是使用 groupby 返回的哈希表。

$groupedDataset = $dataset |
    ForEach-Object {
         [PSCustomObject]@{
            Program          = $_.Program
            AppointmentId    = $_.AppointmentId
            AdminDate        = $_.AdminDate
            CountryName      = $_.CountryName
            SiteCode         = $_.SiteCode
            DateRequested    = $_.DateRequested
            SubjectID        = $_.SubjectID
            AccountID        = $_.AccountID
        }
    } |
    Group-Object -Property SiteCode -AsHashTable

这导致

$groupedDataset | out-host

Count Name  Group                                                                                                                                                                                        
----- ----- ------                                                                                                                                                                               
2     x1111 {@{Program=x; AppointmentId=1234567891; AdminDate=x; CountryName=x; SiteCode=x1111; DateRequested=x; SubjectID=x; AccountID=x}, @{Program=x; AppointmentId=1234567894; AdminDate=x; CountryN...
1     x1112 {@{Program=x; AppointmentId=1234567892; AdminDate=x; CountryName=x; SiteCode=x1112; DateRequested=x; SubjectID=x; AccountID=x}}                                                                
1     x1113 {@{Program=x; AppointmentId=1234567893; AdminDate=x; CountryName=x; SiteCode=x1113; DateRequested=x; SubjectID=x; AccountID=x}

Powershell 分组在不同版本中的行为不同

Powershell Grouping acting differently in different versions

powershell

grouping

piping

versions

powershell-cmdlet