.net - `x <> Nothing` 与 `x IsNot Nothing`

Question

在VB中是否有任何情况x = Nothing与 x is Nothing 不一样?

另外，x <> Nothing对比 x IsNot Nothing
我认为它们完全相同..但只是想确定一下。

Answer 1

空字符串是有区别的，空字符串只用“=”或“<>”算作Nothing，但对于Is/IsNot不算作Nothing:

Public Class Test
    Public Shared Sub Main()
        Dim x As String = ""
        Console.WriteLine(x = Nothing)   ' True
        Console.WriteLine(x Is Nothing)  ' False
    End Sub
End Class