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Public Class Form1
Private Sub NumericUpDown1_ValueChanged(sender As Object, e As EventArgs) Handles NumericUpDown1.ValueChanged
Do While Me.TabControl1.TabCount < NumericUpDown1.Value
TabControl1.TabPages.Add("tab" & TabControl1.TabPages.Count + 1)
Loop
Do While Me.TabControl1.TabCount > NumericUpDown1.Value
TabControl1.TabPages.Remove(TabControl1.TabPages(TabControl1.TabPages.Count - 1))
Loop
End Sub
End Class
二话不说扔一段代码。