Question

我想让我的属性完全私有（获取和设置），如果是这样，更好地使用私有变量而不是属性或使用私有属性本身？

编辑（有关更多问题）

'ok i can use _foo within class and Foo in outside classes
Private _foo As String
Private Property Foo() As String
    Get
        Return _foo
    End Get
    Set(value As String)
        _foo = value
    End Set
End Property

'issue as cannot use _name with class
Property Name as String

'it's ok i can use _age within class but looks not good as e.g above Name... without undescore..
Private _age as Integer

Answer 1

之间没有真正的区别：

Private _foo As String
Private Property Foo() As String
    Get
        Return _foo
    End Get
    Set(value As String)
        _foo = value
    End Set
End Property

和

Private Foo As String

关键字Private使其保持在类的范围内。就这样。您现在无法在任何上下文中的任何位置访问Foo。

然而，使用Property有几个好处。例如，您可以创建一个属性ReadOnly进行访问：

Private _foo As String
Public ReadOnly Property Foo() As String
    Get
        Return _foo
    End Get
End Property

这允许在其源自的类之外进行访问。您可以在原始课程中对_foo进行所有设置，而无需担心课堂外的更改。

Property的另一个好处是可以引发事件和/或记录更改：

Private _foo As String
Public Property Foo() As String
    Get
        Return _foo
    End Get
    Set(value As String)
        If Not (value = _foo) Then
            _foo = value
            NotifyPropertyChanged()
        End If
    End Set
End Property

您还可以验证正在设置的值和/或更新其他私有字段：

Private _foo As Integer
Public WriteOnly Property Foo() As Integer
    Set(value As Integer)
        _foo = value
        If _foo > 10 Then
            _bar = True
        End If
    End Set
End Property

Private _bar As Boolean
Public ReadOnly Property Bar() As Boolean
    Get
        Return _bar
    End Get
End Property

Property也可用于DataBinding，而字段则不能。{/ p>

我确定还有其他差异，但是这应该可以很好地说明您是否需要使用Property或者字段是否足够好。

setter和getter的完整私人财产

1 个答案: