Question

我需要的东西似乎并不特别，但不知何故 - 也许我在谷歌上搜索了错误的关键词 - 我没有在网上找到任何东西。

如何将变量（或对它们的引用？）存储在列表/数组/或类似的东西中，以便当我对列表应用更改时，更改也将应用到变量？

类似于：

Dim myList As New List(Of Object)
Dim a As Integer = 5

myList.Add(a)
myList(0) = 10    'here i want a to change as well

If a = 10 Then
    'This is exactly what I want
Else If a = 5 Then
    'This is what i don't want but what I will get
End If

那么我怎样才能做到这一点？

Answer 1

整数是值类型，而不是像类那样的引用类型。您有该值的两个副本，一次在列表中，一次在变量中。如果你想要这种行为，你需要在列表中存储一个引用类型。例如：

Public Class MyNumber
    Public Sub New(number As int32)
        Value = Number
    End Sub

    Public Property Value As Int32
End Class

Sub Main
    Dim myList As New List(Of MyNumber)
    Dim myFirstNumber As New MyNumber(5)
    myList.Add(myFirstNumber)
    myList(0).Value = 10 

    ' Now both, myFirstNumber.Value and myList(0).Value is 10
End Sub

vb.net：列出变量而不是值

1 个答案: