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      VB.net 2010 視頻教程 VB.net 2010 視頻教程 VB.net 2010 視頻教程
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      • vb.net教程之類的屬性

      • 2015-01-24 12:58 來源:未知
      類的屬性(相關vb.net教程)
      1、屬性的概念
      在系統類中提供了很多屬性,如textbox中有text屬性。類的屬性是一個可以設置值(賦值),也能取出值(引用)的成員。
      初看起來,屬性與類中的變量十分相似,但實際上是不同的。在對類的變量設置值時是沒有檢測功能的,例如設置月份為13月顯然是不正確的。
      顯然需要一種機制,它可以在為對象的成員變量設置值時作檢查,這就是屬性。屬性實際上是一種訪問成員變量的特殊函數。同時,為了保護類的成員變量不被隨意更改,一般被設置成為private,這樣在類的外面通過對象就不能訪問,只能通過一種特殊函數屬性去訪問它。
      2、屬性的定義
      Public property  屬性名稱
      Get  ‘引用屬性

      End get
      Set(byval value as 類型)  ‘設置屬性

      End set
      End property
      .編寫mydate中的year— month—月、 day—日屬性,以完成對成員變量m_year m_month m_day的讀寫并測試。
      程序見,類的屬性應用,程序為:
      Public Class mydate
          Private m_year, m_month, m_day As Integer
          Public Sub New()
              setsystemdate()
          End Sub
          Public Sub New(ByVal y As Integer, ByVal m As Integer, ByVal d As Integer)
              m_year = y : m_month = m : m_day = d
          End Sub
          Public Sub setsystemdate()
              m_year = Microsoft.VisualBasic.Year(Now())
              m_month = Microsoft.VisualBasic.Month(Now)
              m_day = Microsoft.VisualBasic.Day(Now)
          End Sub
          Public Sub show()
              MsgBox(Str(m_year) + "-" + Str(m_month) + "-" + Str(m_day), MsgBoxStyle.OkOnly, "日期")
          End Sub
          Public Property month() As Integer
              Get
                  month = m_month
              End Get
              Set(ByVal m As Integer)
                  m_month = m
              End Set
          End Property
          Public Property year() As Integer
              Get
                  year = m_year
              End Get
              Set(ByVal y As Integer)
                  m_year = y
              End Set
          End Property
          Public Property day() As Integer
              Get
                  day = m_day
              End Get
              Set(ByVal d As Integer)
                  m_day = d
              End Set
          End Property
      End Class
      測試類為:
      Public Class Form1
          Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
              Dim a As New mydate
              a.year = 1996
              a.month = 10
              a.day = 6
              a.show()
          End Sub
      End Class
      說明:
      上面程序對年月日的有效性還不能進行正確性檢查,改進的方法是課本P165-P166的程序,從略。
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