Question

我有Form1和Form2。我想从Form2 Form1中调用函数但它不起作用。我使用Visual Studio 2015。

Public Class Form1
Sub New()
    ' This call is required by the designer.
    InitializeComponent()
    ' Add any initialization after the InitializeComponent() call.
End Sub
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
    Dim form As New Form2
    form.Show()
End Sub

Public Sub Test()
    TextBox1.Text = "Hello"
End Sub
End Class

Public Class Form2
Sub New()
    ' This call is required by the designer.
    InitializeComponent()
    ' Add any initialization after the InitializeComponent() call.
End Sub

Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
    Dim form As New Form1
    form.Test()
End Sub
End Class

Answer 1

当您在Form1点击按钮时，您正在创建另一个Form2，这不是您的父表单。您需要在创建时指定Form2的所有者，然后您可以引用它。像这样：

<强> Form1中：

Public Class Form1
    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
        Dim form As New Form2
        form.Show(Me) 'I am assigning Form2's Owner here
    End Sub

    Public Sub Test()
        TextBox1.Text = "Hello"
    End Sub

End Class

<强>窗体2

Public Class Form2
    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
        CType(Me.Owner, Form1).Test() 'Casting Form2's Owner to Form1 to access your sub

    End Sub

End Class

vb.net与2015年的通话功能

1 个答案: