WPF 可绑定依赖项属性不工作

Question

我绑定如下：

views:SciChartUserControl Name="SciChartUserControl" Quotes="{Binding QuoteCollection}"></views:SciChartUserControl>

我确定 QuoteCollection 会更新，因为网格也绑定到它并且我看到它 updated.I 希望在我的 SciChartUserControl 视图的代码隐藏中得到通知但是QuotesPropertyChanged 永远不会被调用。这让我发疯，我已经尝试了几个小时的不同方法......我忽略了一些明显的东西？

public partial class SciChartUserControl : UserControl
{
    private SciChartControlViewModel _viewModel;

    public SciChartUserControl()
    {

        //Set ViewModel Datacontext
        _viewModel = new SciChartControlViewModel();
        DataContext = _viewModel;

        InitializeComponent();
    }

    public static DependencyProperty QuotesProperty = DependencyProperty.Register("Quotes", typeof(List<Quote>), typeof(SciChartUserControl), new PropertyMetadata(QuotesPropertyChanged));

    public List<Quote> Quotes
    {
        get
        {
            return (List<Quote>)GetValue(QuotesProperty);
        }

        set
        {
            SetValue(QuotesProperty, value);
        }
    }

    private static void QuotesPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        throw new NotImplementedException();

        var quotes = (List<Quote>) e.NewValue;
    }



}

编辑：我添加了承载 SciChartUserControl 的部分视图。

 <dxdo:LayoutPanel Caption="Time Series Visualization">

                        <views:SciChartUserControl Name="SciChartUserControl" Quotes="{Binding QuoteCollection}"></views:SciChartUserControl>

                    </dxdo:LayoutPanel>

                    <dxdo:LayoutPanel Caption="Time Series Data">
                        <dxg:GridControl Name="SampleDataGridControl" ItemsSource="{Binding QuoteCollection}" AutoGenerateColumns="AddNew" EnableSmartColumnsGeneration="True" AutoGeneratedColumns="SampleDataGridControl_OnAutoGeneratedColumns">
                            <dxg:GridControl.View>
                                <dxg:TableView AllowEditing="False" AutoWidth="True" BestFitArea="All" AllowBestFit="True" ShowGroupPanel="True" ShowSearchPanelMode="Always"/>
                            </dxg:GridControl.View>
                        </dxg:GridControl>
                    </dxdo:LayoutPanel>

Answer 1

试试这个... 在依赖项属性声明中将 PropertyMetadata 更改为以下内容..

new PropertyMetadata(null, new PropertyChangedCallback(QuotesPropertyChanged))

Answer 2

尝试为 PropertyMetadata class 使用另一个构造函数：

public static DependencyProperty QuotesProperty = DependencyProperty.Register("Quotes", 
    typeof(List<Quote>), typeof(SciChartUserControl), 
    new PropertyMetadata(someDefaultvalue, QuotesPropertyChanged));

可能是您正在使用的采用 PropertyChangedCallback 对象的单参数构造函数与采用单个 object 参数的构造函数混淆了。

Answer 3

我相信这是因为你在你的代码后面设置了你的 DataContext，我运行在 XAML 中设置它时遇到同样的问题？似乎 DependencyProperty 是相对于 UserControl 的 DataContext 绑定的。 UserControl's DependencyProperty is null when UserControl has a DataContext

<views:SciChartUserControl Name="SciChartUserControl"
                           Quotes="{Binding DataContext.QuoteCollection, RelativeSource={RelativeSource AncestorType={x:Type dxdo:LayoutPanel}}}" />

WPF 可绑定依赖项属性不工作

WPF bindable dependency property is not working

c#

wpf

binding

dependency-properties

WPF 可绑定依赖项 属性 不工作

WPF bindable dependency property is not working

c#

wpf

binding

dependency-properties

WPF 可绑定依赖项属性不工作