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}"
解决方法
有关所有依赖性基础知识,请参阅以下URL
http://www.wpftutorial.net/dependencyproperties.html
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...
}
