if 和elseif 不要重复调用Function

Public Class Form1
    Dim N As Integer
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        N = 0
        For i = 0 To 3
            If GetT(i) = 0 Then

            ElseIf GetT(i) = 1 Then

            ElseIf GetT(i) = 3 Then

            End If
        Next
        MsgBox(N)
    End Sub

    Function GetT(ByVal i As Integer) As Integer
        N += 1
        Return i
    End Function

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        N = 0
        For i = 0 To 3
            Dim T As Integer = GetT(i)
            If T = 0 Then

            ElseIf T = 1 Then

            ElseIf T = 3 Then

            End If
        Next
        MsgBox(N)
    End Sub
End Class