PowerShell 无法确定正在使用的参数集

Question

我有一个带有四个参数的函数，其中两个可以设置也可以不设置。我正在尝试使用参数集来识别已设置的参数，但我在参数集解析方面遇到了一些问题。这些是四个可能的参数集 -

NonErrorObjectOrSplunkData

BothErrorObjectAndSplunkData

OnlyErrorObject

OnlySplunkData

当我使用下面的示例代码测试所有四个参数集时， 的测试只有一个错误对象 和 只有一些 Splunk 数据 都失败并出现以下错误 -

Test-ParameterSets : Parameter set cannot be resolved using the specified named parameters.

从我的研究来看，这似乎失败了，因为 PowerSehll 无法确定参数集是否应该是 BothErrorObjectAndSplunkData或 OnlyErrorObject/ OnlySplunkData ，我可以理解。

如何更改我的代码以确定正在使用上述哪些参数集？如果参数集根本无法实现，我还能如何实现我的目标？

示例代码

function Test-ParameterSets
{
    [CmdLetBinding(DefaultParameterSetName="NeitherErrorObjectOrSplunkData")]
    param(
        [Parameter(Mandatory=$true)]
        [Parameter(ParameterSetName="NeitherErrorObjectOrSplunkData")]
        [Parameter(ParameterSetName="BothErrorObjectAndSplunkData")]
        [parameter(ParameterSetName="OnlyErrorObject")]
        [Parameter(ParameterSetName="OnlySplunkData")]

        [String]$Message,
        [parameter(ValueFromPipeline=$true)]
        [Parameter(ParameterSetName="BothErrorObjectAndSplunkData")]
        [parameter(ParameterSetName="OnlyErrorObject")]

        [Object]$ErrorObject,
        [Parameter(ParameterSetName="BothErrorObjectAndSplunkData")]
        [Parameter(ParameterSetName="OnlySplunkData")]

        [String[]]$SplunkData,
        [ValidateSet("ERROR", "WARN", "INFO")]
        [String]$Severity = "ERROR"
    )

    Write-Host "$message -"
    Write-Host "-- Parameter Set: $($PSCmdlet.ParameterSetName)`n"
    return
}

Test-ParameterSets -Message "Neither an error object or an Splunk data"
Test-ParameterSets -Message "Only an error object" -ErrorObject (New-Object -TypeName PSCustomObject)
Test-ParameterSets -Message "Only some Splunk data" -SplunkData "Test"
Test-ParameterSets -Message "Both an error object and Splunk data" -ErrorObject (New-Object -TypeName PSCustomObject) -SplunkData "Test"

示例代码输出

Neither an error object or an Splunk data -
-- Parameter Set: NeitherErrorObjectOrSplunkData

Test-ParameterSets : Parameter set cannot be resolved using the specified named parameters.
At line:31 char:1
+ Test-ParameterSets -Message "Only an error object" -ErrorObject (New- ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidArgument: (:) [Test-ParameterSets], ParameterBindingException
+ FullyQualifiedErrorId : AmbiguousParameterSet,Test-ParameterSets

Test-ParameterSets : Parameter set cannot be resolved using the specified named parameters.
At line:32 char:1
+ Test-ParameterSets -Message "Only some Splunk data" -SplunkData "Test ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidArgument: (:) [Test-ParameterSets], ParameterBindingException
+ FullyQualifiedErrorId : AmbiguousParameterSet,Test-ParameterSets

Both an error object and Splunk data -
-- Parameter Set: BothErrorObjectAndSplunkData

Answer 1

指定 $ErrorObject和 $SplunkData变量对于这些集合是必需的。

这将允许 PowerShell 区分这些集合，如果只提供一个，或者两者都提供。

根据大卫加德的评论编辑

function Test-ParameterSets
{
    [CmdLetBinding(DefaultParameterSetName="NeitherErrorObjectOrSplunkData")]
    param(
        # edit: removed ParameterSetName as belong to all sets so redundant
        [Parameter(Mandatory=$true)]
        [String]$Message,

        # edit: included ValueFromPipeline in the same Parameter declarations
        # as ParameterSetName
        [Parameter(ValueFromPipeline=$true, Mandatory=$true, ParameterSetName="BothErrorObjectAndSplunkData")]
        [parameter(ValueFromPipeline=$true, Mandatory=$true, ParameterSetName="OnlyErrorObject")]
        [Object]$ErrorObject,

        [Parameter(Mandatory=$true, ParameterSetName="BothErrorObjectAndSplunkData")]
        [Parameter(Mandatory=$true, ParameterSetName="OnlySplunkData")]
        [String[]]$SplunkData,

        [ValidateSet("ERROR", "WARN", "INFO")]
        [String]$Severity = "ERROR"
    )

    Write-Host "$message -"
    Write-Host "-- Parameter Set: $($PSCmdlet.ParameterSetName)`n"
    return
}

Test-ParameterSets -Message "Neither an error object or an Splunk data"
Test-ParameterSets -Message "Only an error object" -ErrorObject (New-Object -TypeName PSCustomObject)
Test-ParameterSets -Message "Only some Splunk data" -SplunkData "Test"
Test-ParameterSets -Message "Both an error object and Splunk data" -ErrorObject (New-Object -TypeName PSCustomObject) -SplunkData "Test"

输出

Neither an error object or an Splunk data -
-- Parameter Set: NeitherErrorObjectOrSplunkData

Only an error object -
-- Parameter Set: OnlyErrorObject

Only some Splunk data -
-- Parameter Set: OnlySplunkData

Both an error object and Splunk data -
-- Parameter Set: BothErrorObjectAndSplunkData