vb.net - 我是初学者，不明白为什么我的代码会抛出 "Expression Expected"

Question

我是开发新手，当我尝试编译下面的代码时收到错误“预期表达式”。我究竟做错了什么？

Public Class Form1

    Private Sub btnCompute_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCompute.Click

        Dim Occupation As String = CStr(txtOccupation.Text)
        Dim Bill As Double = CDbl(txtBill.Text)
        Dim Tip As Double = CDbl(txtTip.Text)

        lstOutput.Text = Bill * (1 + if (Tip<1,Tip,Tip/100))

    End Sub
End Class

Answer 1

我猜在最后一行抛出异常

lstOutput.Text = Bill * (1 + if (Tip<1,Tip,Tip/100))

您使用了 if...then 语句中使用的“if”，但我敢打赌您的意思是 iif，它是一个函数

lstOutput.Text = Bill * (1 + IIf (Tip<1,Tip,Tip/100))

只需添加一个额外的“i”就可以了

Article explaining the difference between "IF" and "IIF()"