“不是……没什么"与“......不是什么" [英] "Not ... Is Nothing" versus "... IsNot Nothing"

问题描述

这里有没有人使用 VB.NET 并且强烈偏好或反对使用 Not foo Is Nothing 而不是 foo IsNot Nothing?如果是，为什么?

Does anyone here use VB.NET and have a strong preference for or against using Not foo Is Nothing as opposed to foo IsNot Nothing? If so, why?

例如

If var1 IsNot Nothing Then
...
End If

和

If Not var1 Is Nothing Then
...
End If

我只想知道哪个更好?
他们都同样可以接受吗?

I just want to know which one is better?
Are they both equally acceptable?

推荐答案

If Not var1 Is Nothing Then

是 VB6 的宿醉.过去没有 IsNot，因此这是确定变量是否不是 Nothing 的唯一方法.在VB.NET中似乎是多余的.

Is a hangover from VB6. There didn't used to be an IsNot, and so this was the only way to determine if a variable was not Nothing. It seems to be redundant in VB.NET.

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