Question

似乎过高地确定一种无效的类型的价值,并实行冻结。是否有更好的办法这样做?

        Private _WorkPhone As Long?
    Public Property [WorkPhone]() As Long?
        Get
            Return _WorkPhone
        End Get
        Set(ByVal value As Long?)
            If value.HasValue = False Then
                If _WorkPhone.HasValue = True Then
                    MyBase.RaisePropertyChanging("WorkPhone")
                    _WorkPhone = Nothing
                    MyBase.MarkDirty()
                    MyBase.RaisePropertyChanged("WorkPhone")
                End If
            Else
                If _WorkPhone.HasValue Then
                    If _WorkPhone.Value <> value.Value Then
                        MyBase.RaisePropertyChanging("WorkPhone")
                        _WorkPhone = value
                        MyBase.MarkDirty()
                        MyBase.RaisePropertyChanged("WorkPhone")
                    End If
                Else
                    MyBase.RaisePropertyChanging("WorkPhone")
                    _WorkPhone = value
                    MyBase.MarkDirty()
                End If
                MyBase.RaisePropertyChanged("WorkPhone")
            End If
        End Set
    End Property

我尝试使用简单的法典,但我在上的休息点。 MyBase.RaisePropertyChanging(“WorkPhone”)从未受到过任何打击,其价值从未发生变化。

    If _WorkPhone <> value Then
    MyBase.RaisePropertyChanging("WorkPhone")
    _WorkPhone = value
    MyBase.MarkDirty()
    MyBase.RaisePropertyChanged("WorkPhone")
End If

Answer 1

没有必要所有复杂的逻辑。如果并且只在下述情况下,<代码>x和y均为无效,其基础相同:x等于。

x.HasValue is true
y.HasValue is true
x.Value equals y.Value

或

x.HasValue is false
y.HasValue is false

In neither of these cases would we want to raise a property changed notification and thus a simple test f或 non-equality will suffice. Thus:

Private _W或kPhone As Long?
    Public Property [W或kPhone]() As Long?
        Get
            Return _W或kPhone
        End Get
        Set(ByVal value As Long?)
            If Not _w或kPhone.Equals(value)
                MyBase.RaisePropertyChanging("W或kPhone")
                _W或kPhone = value
                MyBase.MarkDirty()
                MyBase.RaisePropertyChanged("W或kPhone")
            EndIf
        End Set
    End Property

请注意,如果其歌剧为Not Nullable (Of T.Equals 而不是<>,作为后者评价Nothing ,则我们应使用。

Answer 2

页: 1 我注意到你正在利用LONG储存工作电话号码。即便没有签名,这也会在美国的429号区域代码上失败。您可考虑代议或战略

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