powershell - 为什么Write-Output在PowerShell类方法中不起作用？

Question

我正在尝试使用Write-Output输出变量，但是在PowerShell类方法中不起作用。 Write-Host正在工作。请参见下面的示例代码。

class sample {
  [string] sampleMethod() {
    $output = "Output message"
    try {
      Write-Output $output
      throw "error"
    }
    catch {
      Write-Output $output
      $_
    }
    return "err"
  }
}    

$obj = [sample]::new()
$obj.sampleMethod()

有什么特定原因导致 Write-Output在类方法中不起作用？

Answer 1

从docs:

In class methods, no objects get sent to the pipeline except those mentioned in the return statement. There's no accidental output to the pipeline from the code.

This is fundamentally different from how PowerShell functions handle output, where everything goes to the pipeline.

如果您仅需要调试输出或其他输出，则可以使用 Write-Host， Write-Warning等，它们基本上只是写入控制台。