聲明Button1_Click中的全局變量

Question

我試圖谷歌這個升技，但我could'nt找到任何有用的東西。所以，我在Form1_Load的我有這個變量

Dim Myvariable As String 

然後在點擊一個按鈕我想

Myvariable = "Hello" 

問題是，我的代碼告訴我，MYVARIABLE在button_click沒有宣佈它是。

感謝您的任何幫助。

Answer 1

將變量作爲表單類中的字段或屬性移動。下面是示例代碼：

Public Class Form1 
    Private MyVariable 

    Private Sub Form1_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load 
     MyVariable = "Hello" 
    End Sub 

    Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click 
     MessageBox.Show(MyVariable) 
    End Sub 
End Class