Question

我创建了这个名为Cflowcontrol的自定义控件，我需要知道此控件的FlowDirection何时更改

所以这就是我所做的：

Inherits FlowLayoutPanel
Implements INotifyPropertyChanged

Private Fdirection As FlowDirection
Public Event FDirectionChanged As PropertyChangedEventHandler Implements INotifyPropertyChanged.PropertyChanged
Private Sub NotifyPropertyChanged(ByVal info As String)
    RaiseEvent FDirectionChanged(Me, New PropertyChangedEventArgs(info))
End Sub
Shadows Property FlowDirection As FlowDirection
    Get
        Return Fdirection
    End Get
    Set(value As FlowDirection)
        If value <> Fdirection Then
            Fdirection = value
            NotifyPropertyChanged("FlowDirection")
        End If
    End Set
End Property

到目前为止它很好地告诉我什么时候属性改变它的价值问题是面板内控件的流向不再改变

Answer 1

您需要告诉基本控件自行更新：

Protected Sub OnNotifyPropertyChanged(info As String)
  RaiseEvent FDirectionChanged(Me, New PropertyChangedEventArgs(info))
End Sub

Shadows Property FlowDirection As FlowDirection
  Get
    Return MyBase.FlowDirection
  End Get
  Set(value As FlowDirection)
    If value <> MyBase.FlowDirection Then
      MyBase.FlowDirection = value
      OnNotifyPropertyChanged("FlowDirection")
    End If
  End Set
End Property

FlowLayoutPanel的OnFlowDirection更改

1 个答案: