将普通属性转换为依赖属性

Question

我有一个控件,我用于我的新应用程序.此控件具有常规属性.

    Public Property Value() As String
    Get
        If AutoCompleteTextBox.SearchText Is Nothing Then
            Return String.Empty
        Else
            Return AutoCompleteTextBox.SearchText.ToString.Trim
        End If
    End Get
    Set(value As String)
        AutoCompleteTextBox.SearchText = value
    End Set
End Property

编辑:

所以,经过多次尝试,我终于到了这个阶段.

    Public Shared ValueProperty As DependencyProperty = DependencyProperty.Register("Value", GetType(String), GetType(AutoCompleteBox))
Public Property Value() As String
    Get
        Return Me.GetValue(ValueProperty).ToString
    End Get
    Set(value As String)
        Me.SetValue(ValueProperty, value)
    End Set
End Property
Public Event PropertyChanged As PropertyChangedEventHandler _
        Implements INotifyPropertyChanged.PropertyChanged

这是依赖属性.此属性仍然没有约束力.输出窗口中没有显示绑定错误.

Text="{Binding RelativeSource={RelativeSource Self}, Path=Value, Mode=TwoWay}"

这是我的绑定方法.我不知道我还能做什么.至少如果出现错误,我本可以找到一些东西.没有任何错误,我只是一个没头的鸡.

Answer 1

请参阅以下网址了解所有依赖项基础知识 http://www.wpftutorial.net/dependencyproperties.html

基本上，您可以通过提供 FrameworkPropertyMetadata 来获取依赖项属性的属性更改事件。

new FrameworkPropertyMetadata( [Default Value], 
                   OnCurrentTimePropertyChanged);

您可以在事件处理程序中取回目标控件（DependencyObject）并在那里实现您的逻辑

private static void OnCurrentTimePropertyChanged(DependencyObject source, 
    DependencyPropertyChangedEventArgs e)
{
    AutoCompleteTextBox control = source as AutoCompleteTextBox;
    string time = (string)e.NewValue;
    // Put some update logic here...
}