vb.net 4.0 iif問題，當有一個參數集

Question

任何人都可以看到我在這裏做錯了嗎？該頁面應該「YES這是一個測試」

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

你只是缺少Istest退貨：

有關代碼

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

兩個小技巧。

1. 使用If() operator而不是Iif，其工作方式相同，但使用短路評估。沒有理由可以考慮通過If（）來使用Iif（）。
2. 你實際上並不需要使用如果或IIF都在你的IsTest屬性：

---

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