vb.net 中的变量/属性更改事件 [英] variable/property changed event in vb.net

问题描述

如何创建在更改变量或属性时引发的事件(或者我是否可以将要放在事件中的代码放在属性的 Set 部分?

How can I make an event that is raised when a variable or property is changed (or can I just put the code I would put in an event in the Set section of a property?

推荐答案

来自 MSDN 库条目 INotifyPropertyChanged.PropertyChanged 事件:

Public Class DemoCustomer
    Implements INotifyPropertyChanged

    Private customerNameValue As String = String.Empty

    Public Event PropertyChanged As PropertyChangedEventHandler _
        Implements INotifyPropertyChanged.PropertyChanged

    Private Sub NotifyPropertyChanged(ByVal info As String)
        RaiseEvent PropertyChanged(Me, New PropertyChangedEventArgs(info))
    End Sub

    Public Property CustomerName() As String
        Get
            Return Me.customerNameValue
        End Get

        Set(ByVal value As String)
            If Not (value = customerNameValue) Then
                Me.customerNameValue = value
                NotifyPropertyChanged("CustomerName")
            End If
        End Set
    End Property
End Class

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