Question

如何在变量值改变时触发事件 VB.NET

Answer 1

'vb.net2008

Public Class Form1
Public y_change, y_0 As String
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
y_change = Nothing : y_0 = Nothing
Timer1.Interval = 100
Timer1.Enabled = True
End Sub

Private Sub TextBox1_DoubleClick(ByVal sender As Object, ByVal e As System.EventArgs) Handles TextBox1.DoubleClick
y_change = TextBox1.Text
End Sub

Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
Timer1.Enabled = False
If y_change <> y_0 Then
MsgBox("变量值改变") '变量值改变时触发事件
y_0 = y_change
End If
Timer1.Enabled = True
End Sub
End Class