vb.net Do Loop使用 [Do Loop]

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Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Dim Porcion As Integer = 503 Do If Porcion = 0 Then Exit Do Else If Porcion < 100 Then Porcion = 0 Else Porcion = Porcion - 30 End If End If Loop End Sub