如何在VB.NET中为List中的结构元素分配值？

我在列表中有一个用户定义的结构,我试图在结构列表中的单个元素中更改值.访问元素不是问题.但是,当我尝试更新该值时,编译器抱怨：

“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

正如其他评论所说,当您引用记录(0)时,您将获得一个结构体的副本,因为它是一个值类型.你可以做什么(如果你不能把它改成一个类)就是这样的：

Dim p As Person = records(0)
p.first = "Papa"
records(0) = p

虽然,我认为使用一个类更简单.