如何將數據從父表單傳遞給子表單

Question

我有2個表單，Form1是父表單，Form2是子表單。他們都設置爲顯示在同一時間..... Form1的中間容器設置爲true，並有一個按鈕，Form2有一個文本框......我想，如果我按下Form1中的按鈕將出現在文本框在窗體2

Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load 

    IsMdiContainer = True 
    Dim inv As New Form2 
    inv.MdiParent = Me 
    inv.Show() 
    inv.Location = New Point(15, 15) 

End Sub 

我試着點擊按鈕，但什麼都沒有發生，我也嘗試過周圍的其他方法...投入Form2的一個按鈕，在Form1上的文本框，它的工作原理...

Answer 1

，你必須將inv變量遷出的Form_Load範圍

Public Class Form1 

Private inv As New Form2 'here 

Private Sub Form1_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load 
    IsMdiContainer = True 

    inv.MdiParent = Me 
    inv.Show() 
    inv.Location = New Point(15, 15) 
End Sub 

Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click 
    inv.TextBox1.Text = "Hello World" 
End Sub 

End Class 

Answer 2

假設你有一個Form2的控制TextBox1中和在Form1上一個按鈕，在點擊Form1上按鈕的「Hello World」將出現在Form 2上TextBox1的，只是做了這樣的...

Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click 
    Form2.TextBox1.Text="Hello World" 
End Sub