有参数集时的vb.net 4.0 iif问题

Question

谁能看到我在这里做错了什么？页面应该“是的，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

你只是错过了 Istest 的回报：

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

关于您的代码的两个提示。

1. 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()。
2. 您实际上根本不需要在 IsTest 属性中使用 If 或 Iif：

---

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