[ADSI] :: Exists引发异常，而不返回False [英] [ADSI]::Exists throws an exception instead of returning False

问题描述

我正在尝试使用ADSI对象创建用户（如果尚不存在）。这是我得到的奇怪结果

I'm trying to create a user using the ADSI object if it doesn't already exist. Here are the strange results I'm getting

#Check a user that I know exists
[ADSI]::Exists("WinNT://localhost/micah,user") #True

#Check a group that I know exists
[ADSI]::Exists("WinNT://localhost/administrators,group") #True

#Check a group that DOESN'T exist
[ADSI]::Exists("WinNT://localhost/whoops,group") #False

#Check a user that DOESN'T exist (NOT specifying that the obect is a user)
[ADSI]::Exists("WinNT://localhost/test") #False (This works fine)

#Check a user that DOESN'T exist (specifying that the obect IS a user)
[ADSI]::Exists("WinNT://localhost/test,user") 
#Throws exception "The user name could not be found"

最后一个线对我来说毫无意义。当我指定要特别寻找用户时，为什么会抛出异常，但是当我不想指定用户时，为什么会正常工作？在我看来，这完全是不直观的。我缺少什么？

The last line makes no sense to me. Why would it throw an exception when I specify that I'm specifically looking for a user, but when I DONT specify that I want a user it works just fine? This seems completely unintuitive to me. What am I missing?

推荐答案

它是一个错误，Microsoft不会修复-

Its a bug and Microsoft will not fix it --

http： //connect.microsoft.com/VisualStudio/feedback/details/337682/directoryentry-exists-throws-exception-for-on-existent-winnt-object

我们正在解决此错误，因为它无法修复。尽管设计不是
正确的……但应用程序可能是期望如此编写的，而更改
可能会破坏这些应用程序。解决方法是捕获异常-不是
漂亮，同意，但没有足够的理由进行修复。
文档需要修复，我将为此
打开一个文档工作项。

We are resolving this bug as won't fix. Although the design isn't right... Apps might have been written expecting this - and the change might break those apps. The workaround is to catch the exception - not pretty, agreed, but not enough justification for a fix. The documentation needs to be fixed and I will open a doc workitem for this.

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