在Powershell中，我可以確定我的函數是否使用-ErrorAction SilentlyContinue調用？

Question

在我的腳本中，爲了確定是否發生錯誤，我需要做兩個額外的遠程查詢。這些需要大約200毫秒，並且如果用戶忽略錯誤則毫無意義。有沒有辦法確定我是否用-ErrorAction SilentlyContinue撥打電話？或者如果調用者不需要，還是必須添加一個單獨的開關來抑制驗證？

Answer 1

如果需要，可以檢查$ErrorActionPreference變量以查看應該如何處理錯誤。

如果你做Get-Help about_preference_variables，你可以閱讀更多關於這個和其他偏好變量。

編輯2014年4月22日：添加測試這種行爲

一個例子下面是如何測試這樣一個例子：

function Test-Error 
{ 
    [CmdletBinding()] 
    PARAM() 

    Write-Host "Error action preference is '$ErrorActionPreference'" 
    Write-Error "This is a test error" 
} 

Test-Error 
Test-Error -ErrorAction SilentlyContinue 
Test-Error -ErrorAction Continue 
Test-Error -ErrorAction Stop 
Write-Host "We shouldn't get here, since last error action was 'Stop'" 

我們得到以下的輸出：

Error action preference is 'Continue' 
Test-Error : This is a test error 
At line:12 char:5 
+  Test-Error 
+  ~~~~~~~~~~ 
    + CategoryInfo   : NotSpecified: (:) [Write-Error], WriteErrorException 
    + FullyQualifiedErrorId : Microsoft.PowerShell.Commands.WriteErrorException,Test-Error 

Error action preference is 'SilentlyContinue' 
Error action preference is 'Continue' 
Test-Error : This is a test error 
At line:14 char:5 
+  Test-Error -ErrorAction Continue 
+  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 
    + CategoryInfo   : NotSpecified: (:) [Write-Error], WriteErrorException 
    + FullyQualifiedErrorId : Microsoft.PowerShell.Commands.WriteErrorException,Test-Error 

Error action preference is 'Stop' 
Test-Error : This is a test error 
At line:15 char:5 
+  Test-Error -ErrorAction Stop 
+  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 
    + CategoryInfo   : NotSpecified: (:) [Write-Error], WriteErrorException 
    + FullyQualifiedErrorId : Microsoft.PowerShell.Commands.WriteErrorException,Test-Error