vb.net - 如何在 VB.NET 中为 List 中的结构元素赋值？

Question

我在列表中有一个用户定义的结构，我试图更改结构列表中单个元素的值。访问元素不是问题。但是，当我尝试更新值时，编译器会提示:

"Expression is a value and therefore cannot be the target of the assignment"

例如:

Public Structure Person

    Dim first as String
    Dim last as String
    Dim age as Integer

End Structure

_

Public Sub ListTest()

    Dim newPerson as Person

    Dim records as List (Of Person)
    records = new List (Of Person)

    person.first = "Yogi"
    person.last = "bear"
    person.age = 35

    records.Add(person)
    records(0).first = "Papa"  ' <<== Causes the error
End Sub

Answer 1

我遇到了同样的问题，我通过向更改属性值的结构添加一个简单的 Sub 来修复它。

Public Structure Person

 Dim first as String
 Dim last as String
 Dim age as Integer

 Public Sub ChangeFirst(value as String)
  me.first = value
 End Sub

End Structure