WPF

Question

这是一个非常简单的 class 初始设置控件是否处于编辑模式

Public Class DateTBx
    Inherits DevComponents.WpfEditors.DateTimeInput
    Private _TextBoxNewRecord As Boolean

    Public Property IsNewRecord As Boolean
        Get
            Return _TextBoxNewRecord
        End Get
        Set(value As Boolean)
            _TextBoxNewRecord = value
        End Set
    End Property
    Protected Overrides Sub OnInitialized(e As System.EventArgs)
        MyBase.OnInitialized(e)
        VerticalAlignment = Windows.VerticalAlignment.Center
        HorizontalAlignment = Windows.HorizontalAlignment.Left
        BorderBrush = New SolidColorBrush(Colors.Silver)
        ClearButtonVisibility = Windows.Visibility.Hidden

        If _TextBoxNewRecord = True Then
            BorderThickness = New Thickness(1)
            IsEnabled = True
        Else
            BorderThickness = New Thickness(0)
            IsEnabled = False
        End If

    End Sub


End Class

这很好，直到我想更改 IsNewRecord 值，当然它不起作用。我知道使用 DependencyProperty 是可行的方法，并且尝试了一些变体，但灯仍然没有打开 - 这是一次尝试。将不胜感激。

Public Class DateTBx
Inherits DevComponents.WpfEditors.DateTimeInput
Public Shared IsNewRecordProperty As DependencyProperty = DependencyProperty.Register("IsNewRecord", GetType(Boolean), GetType(DateTBx), New PropertyMetadata(New PropertyChangedCallback(AddressOf IsNewRecordChanged)))
Private _TextBoxNewRecord As Boolean

Public Property IsNewRecord As Boolean
    Get
        Return _TextBoxNewRecord
    End Get
    Set(value As Boolean)
        _TextBoxNewRecord = value
    End Set
End Property



Protected Overrides Sub OnInitialized(e As System.EventArgs)
    MyBase.OnInitialized(e)
    VerticalAlignment = Windows.VerticalAlignment.Center
    HorizontalAlignment = Windows.HorizontalAlignment.Left
    BorderBrush = New SolidColorBrush(Colors.Silver)
    ClearButtonVisibility = Windows.Visibility.Hidden

    If _TextBoxNewRecord = True Then
        BorderThickness = New Thickness(1)
        IsReadOnly = False
    Else
        BorderThickness = New Thickness(0)
        IsReadOnly = True
    End If

End Sub

Private Shared Sub IsNewRecordChanged(Sender As DependencyObject, e As DependencyPropertyChangedEventArgs)
    Dim vControl As DateTBx = TryCast(Sender, DateTBx)
    Dim vBoolean As Boolean = e.NewValue
    If vBoolean = True Then
        vControl.BorderThickness = New Thickness(1)
        vControl.IsReadOnly = False
    Else
        vControl.BorderThickness = New Thickness(0)
        vControl.IsReadOnly = True
    End If
End Sub

结束Class

Answer 1

在使用依赖项属性时，您需要使用 GetValue 和 SetValue，所以像这样的东西应该可以工作：

Public Property IsNewRecord As Boolean
    Get
        Return CBool(GetValue(IsNewRecordProperty))
    End Get
    Set(value As Boolean)
        SetValue(IsNewRecordProperty, value)
    End Set
End Property

删除 Private _TextBoxNewRecord As Boolean 变量，并在其余代码中使用 IsNewRecord 属性。

WPF - 更新自定义控件中的值

WPF - Update Value in Custom Control

vb.net

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