表单点击对象引用错误未设置为对象的实例

Question

当我单击form1按钮1以显示form2但它显示错误是：

Object reference not set to an instance of an object.

Form1中：

Public Class Form1
 Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
    Form2. Show()
    Me.Hide()

 End Sub
End Class

Answer 1

我建议在方法之外声明它，这样你就可以从其他方法访问它：

Private _Form2 as new Form2

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

 Me._Form2.Show()
 Me.Hide()

End Sub

Answer 2

试试这个：

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
    Dim newform as New Form2
    newform.Show()
    Me.Hide()
End Sub

您可以打开多个相同的表单，因此您需要先创建表单的“实例”，然后才能告诉它显示该实例。