VB.NET中的Coalesce运算符和条件运算符

Question

可能重复:
VB.NET中是否有条件三元运算符？

大家好,我们可以在VB.NET中使用Coalesce运算符(??)和条件三元运算符(:),就像在C#中一样？

Answer 1

我认为你可以使用内联if语句来接近:

//C#
int x = a ? b : c;

'VB.Net
Dim x as Integer = If(a, b, c)

Answer 2

Sub Main()
    Dim x, z As Object
    Dim y As Nullable(Of Integer)
    z = "1243"

    Dim c As Object = Coalesce(x, y, z)
End Sub

Private Function Coalesce(ByVal ParamArray x As Object())
    Return x.First(Function(y) Not IsNothing(y))
End Function

Answer 3

仅供参考，String的Coalesce运算符

Private Function Coalesce(ByVal ParamArray Parameters As String()) As String
    For Each Parameter As String In Parameters
        If Not Parameter Is Nothing Then
            Return Parameter
        End If
    Next
    Return Nothing
End Function