Question

谁能看到我在这里做错了什么？页面应该是“这是一个测试”

Partial Public Class testForm1
    Inherits System.Web.UI.Page
    Private Property test() As String
        Get
            'if is in session, return it, otherwise look it up
            If (IsNothing(Session("test"))) Then
                Session("test") = ""
            End If

            Return Session("test")

        End Get
        Set(ByVal Value As String)
            Session("test") = Value
        End Set
    End Property

    Public ReadOnly Property Istest As Boolean
        Get
            IIf(test.Contains("yes"), True, False)

        End Get
    End Property

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        test = "yes"
        Response.Write(IIf(Istest, "YES This is a test", "NO testing here"))

    End Sub



End Class

Answer 1

你刚刚错过了Istest中的回归：

Public ReadOnly Property Istest As Boolean
    Get
        Return IIf(test.Contains("yes"), True, False)
    End Get
End Property

有关您的代码的两个提示。

使用If() operator代替Iif，它的工作方式相同但使用短路评估。我没有理由认为Iif（）优于If（）。
您实际上并不需要在IsTest属性中使用If或Iif：

Public ReadOnly Property Istest As Boolean
    Get
        Return test.Contains("yes")
    End Get
End Property

vb.net 4.0 iif问题有参数集时

1 个答案: