Vb.net &引用;对象引用未设置为对象的实例;正在尝试添加到列表中
我创建了一个对象“email”列表,其中包含“email”对象,该对象有3个参数(字符串地址、字符串主题、字符串正文) 然后我想通过创建更多的“电子邮件”实例来添加到列表中。然而,我尝试了很多不同的方法,但都没有成功Vb.net &引用;对象引用未设置为对象的实例;正在尝试添加到列表中,vb.net,Vb.net,我创建了一个对象“email”列表,其中包含“email”对象,该对象有3个参数(字符串地址、字符串主题、字符串正文) 然后我想通过创建更多的“电子邮件”实例来添加到列表中。然而,我尝试了很多不同的方法,但都没有成功 Public Class Test Public emails As List(Of Email) Private Sub Test_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) H
Public Class Test
Public emails As List(Of Email)
Private Sub Test_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
emails(0).setAddress("Hello")
emails(0).setSubject("World2")
emails(0).setBody("Why don't you work?")
emails.Add(New Email("Hello2", "World2", "Why don't you work?2"))
End Sub
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Label1.Text = emails(0).getAddress
Label2.Text = emails(0).getSubject
Label3.Text = emails(0).getBody
Label4.Text = emails(1).getAddress
Label5.Text = emails(1).getSubject
Label6.Text = emails(1).getBody
End Sub
End Class
如果单击按钮1,则会出现错误“对象引用未设置为对象的实例”
谢谢。您没有创建列表的实例,您只是声明了它
Public emails As New List(Of Email)
' ^^^