powershell - PS パイプラインの複数パラメーターのバインド

Question

パイプラインを介して 2 つのパラメーターを関数に渡そうとしていますが、期待どおりに機能していないようで、その理由を理解するのに苦労しています。

MWE

function Test-Pipeline {
  [CmdletBinding ()]
  Param(
    [Parameter(ValueFromPipeline=$true)][String]$Name,
    [Parameter(ValueFromPipeline=$true)][String]$Value
  )
  Write-Host "Name: $Name"
  Write-Host "Value: $Value"
}

"Name", "Value" | Test-Pipeline

出力

名前: 値

値: 値

コマンドを実行して、Trace-Command何が起こっているのかを確認してみました。Value35 行目で、が にバインドされていることがわかります$Parameter。

PowerShell が 2 番目の入力を両方のパラメーターにバインドしているのはなぜですか? これが予想される場合、最初のパラメーターではなく 2 番目のパラメーターでのみ発生するのはなぜですか?

痕跡

DEBUG: ParameterBinding Information: 0 : BIND NAMED cmd line args [Test-Pipeline]
DEBUG: ParameterBinding Information: 0 : BIND POSITIONAL cmd line args [Test-Pipeline]
DEBUG: ParameterBinding Information: 0 : MANDATORY PARAMETER CHECK on cmdlet [Test-Pipeline]
DEBUG: ParameterBinding Information: 0 :     BIND arg [] to parameter [Name]
DEBUG: ParameterBinding Information: 0 :         Executing DATA GENERATION metadata: [System.Management.Automation.ArgumentTypeConverterAttribute]
DEBUG: ParameterBinding Information: 0 :             result returned from DATA GENERATION:
DEBUG: ParameterBinding Information: 0 :         COERCE arg to [System.String]
DEBUG: ParameterBinding Information: 0 :             Parameter and arg types the same, no coercion is needed.
DEBUG: ParameterBinding Information: 0 :         BIND arg [] to param [Name] SUCCESSFUL
DEBUG: ParameterBinding Information: 0 :     BIND arg [] to parameter [Value]
DEBUG: ParameterBinding Information: 0 :         Executing DATA GENERATION metadata: [System.Management.Automation.ArgumentTypeConverterAttribute]
DEBUG: ParameterBinding Information: 0 :             result returned from DATA GENERATION:
DEBUG: ParameterBinding Information: 0 :         COERCE arg to [System.String]
DEBUG: ParameterBinding Information: 0 :             Parameter and arg types the same, no coercion is needed.
DEBUG: ParameterBinding Information: 0 :         BIND arg [] to param [Value] SUCCESSFUL
DEBUG: ParameterBinding Information: 0 : CALLING BeginProcessing
DEBUG: ParameterBinding Information: 0 : BIND PIPELINE object to parameters: [Test-Pipeline]
DEBUG: ParameterBinding Information: 0 :     PIPELINE object TYPE = [System.String]
DEBUG: ParameterBinding Information: 0 :     RESTORING pipeline parameter's original values
DEBUG: ParameterBinding Information: 0 :     Parameter [Value] PIPELINE INPUT ValueFromPipeline NO COERCION
DEBUG: ParameterBinding Information: 0 :     BIND arg [Name] to parameter [Value]
DEBUG: ParameterBinding Information: 0 :         Executing DATA GENERATION metadata: [System.Management.Automation.ArgumentTypeConverterAttribute]
DEBUG: ParameterBinding Information: 0 :             result returned from DATA GENERATION: Name
DEBUG: ParameterBinding Information: 0 :         BIND arg [Name] to param [Value] SUCCESSFUL
DEBUG: ParameterBinding Information: 0 :     Parameter [Name] PIPELINE INPUT ValueFromPipeline NO COERCION
DEBUG: ParameterBinding Information: 0 :     BIND arg [Name] to parameter [Name]
DEBUG: ParameterBinding Information: 0 :         Executing DATA GENERATION metadata: [System.Management.Automation.ArgumentTypeConverterAttribute]
DEBUG: ParameterBinding Information: 0 :             result returned from DATA GENERATION: Name
DEBUG: ParameterBinding Information: 0 :         BIND arg [Name] to param [Name] SUCCESSFUL
DEBUG: ParameterBinding Information: 0 : MANDATORY PARAMETER CHECK on cmdlet [Test-Pipeline]
DEBUG: ParameterBinding Information: 0 : BIND PIPELINE object to parameters: [Test-Pipeline]
DEBUG: ParameterBinding Information: 0 :     PIPELINE object TYPE = [System.String]
DEBUG: ParameterBinding Information: 0 :     RESTORING pipeline parameter's original values
DEBUG: ParameterBinding Information: 0 :     Parameter [Name] PIPELINE INPUT ValueFromPipeline NO COERCION
DEBUG: ParameterBinding Information: 0 :     BIND arg [Value] to parameter [Name]
DEBUG: ParameterBinding Information: 0 :         Executing DATA GENERATION metadata: [System.Management.Automation.ArgumentTypeConverterAttribute]
DEBUG: ParameterBinding Information: 0 :             result returned from DATA GENERATION: Value
DEBUG: ParameterBinding Information: 0 :         BIND arg [Value] to param [Name] SUCCESSFUL
DEBUG: ParameterBinding Information: 0 :     Parameter [Value] PIPELINE INPUT ValueFromPipeline NO COERCION
DEBUG: ParameterBinding Information: 0 :     BIND arg [Value] to parameter [Value]
DEBUG: ParameterBinding Information: 0 :         Executing DATA GENERATION metadata: [System.Management.Automation.ArgumentTypeConverterAttribute]
DEBUG: ParameterBinding Information: 0 :             result returned from DATA GENERATION: Value
DEBUG: ParameterBinding Information: 0 :         BIND arg [Value] to param [Value] SUCCESSFUL
DEBUG: ParameterBinding Information: 0 : MANDATORY PARAMETER CHECK on cmdlet [Test-Pipeline]
DEBUG: ParameterBinding Information: 0 : CALLING EndProcessing
DEBUG: ParameterBinding Information: 0 :     BIND NAMED cmd line args [Write-Host]
DEBUG: ParameterBinding Information: 0 :     BIND POSITIONAL cmd line args [Write-Host]
DEBUG: ParameterBinding Information: 0 :     BIND REMAININGARGUMENTS cmd line args to param: [Object]
DEBUG: ParameterBinding Information: 0 :         BIND arg [System.Collections.Generic.List`1[System.Object]] to parameter [Object]
DEBUG: ParameterBinding Information: 0 :             COERCE arg to [System.Object]
DEBUG: ParameterBinding Information: 0 :                 Parameter and arg types the same, no coercion is needed.
DEBUG: ParameterBinding Information: 0 :             BIND arg [System.Collections.Generic.List`1[System.Object]] to param [Object] SUCCESSFUL
DEBUG: ParameterBinding Information: 0 :     MANDATORY PARAMETER CHECK on cmdlet [Write-Host]
DEBUG: ParameterBinding Information: 0 :     CALLING BeginProcessing
Name: Value
DEBUG: ParameterBinding Information: 0 :     CALLING EndProcessing
DEBUG: ParameterBinding Information: 0 :     BIND NAMED cmd line args [Write-Host]
DEBUG: ParameterBinding Information: 0 :     BIND POSITIONAL cmd line args [Write-Host]
DEBUG: ParameterBinding Information: 0 :     BIND REMAININGARGUMENTS cmd line args to param: [Object]
DEBUG: ParameterBinding Information: 0 :         BIND arg [System.Collections.Generic.List`1[System.Object]] to parameter [Object]
DEBUG: ParameterBinding Information: 0 :             COERCE arg to [System.Object]
DEBUG: ParameterBinding Information: 0 :                 Parameter and arg types the same, no coercion is needed.
DEBUG: ParameterBinding Information: 0 :             BIND arg [System.Collections.Generic.List`1[System.Object]] to param [Object] SUCCESSFUL
DEBUG: ParameterBinding Information: 0 :     MANDATORY PARAMETER CHECK on cmdlet [Write-Host]
DEBUG: ParameterBinding Information: 0 :     CALLING BeginProcessing
Value: Value
DEBUG: ParameterBinding Information: 0 :     CALLING EndProcessing