Question

我创建了一个自定义控件，其属性包含在自定义类型列表（list<OHLCV>）中。我正在使用依赖属性来允许它可绑定。

这是我背后的代码

public partial class GraphControl : UserControl
{

    //OHLCVSerie Property

    public List<OHLCV> OHLCVSerie 
    { 
        get { return (List<OHLCV>)GetValue(OHLCVSerieProperty); }
        set { SetValueDP(OHLCVSerieProperty, value); }
    }

    public static readonly DependencyProperty OHLCVSerieProperty =
        DependencyProperty.Register("OHLCVSerie", typeof(List<OHLCV>), typeof(GraphControl), null);

    //reuse

    public event PropertyChangedEventHandler PropertyChanged;
    void SetValueDP(DependencyProperty property, object value,
        [System.Runtime.CompilerServices.CallerMemberName] String p = null)
    {
        SetValue(property, value);
        if (PropertyChanged != null)
            PropertyChanged(this, new PropertyChangedEventArgs(p));
    }

    public GraphControl()
    {
        InitializeComponent();
        (this.Content as FrameworkElement).DataContext = this;
    }
}

尚未修改XAML（=用户控件为空，除了后面的代码）

在我的主窗口中，我创建了一个自定义控件的实例，并将其绑定到list<OHLCV>

<Window x:Class="MarketAnalyzer.Tester.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:grph="clr-namespace:MarketAnalyzer.DataVisualization;assembly=MarketAnalyzer.DataVisualization"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="MainWindow" Height="350" Width="525">
<Grid>
    <grph:GraphControl OHLCVSerie="{Binding OHLCVSerie}" Margin="0,41,0,0"/>
    <Button Content="Button" HorizontalAlignment="Left" Margin="10,10,0,0" VerticalAlignment="Top" Width="75" Click="Button_Click"/>
</Grid>

后面的代码在MainWindow的初始化时创建list<OHLCV>，而按钮在单击时修改列表。

    public partial class MainWindow : Window, INotifyPropertyChanged
{
    protected virtual void RaisePropertyChanged(string propertyName)
    {
        if (PropertyChanged != null)
            PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
    }

    public event PropertyChangedEventHandler PropertyChanged;

    /// <summary>
    /// The OHLCV Serie
    /// </summary>
    private List<OHLCV> _ohlcvserie;
    public List<OHLCV> OHLCVSerie
    {
        get { return _ohlcvserie; }
        set
        {
            if (_ohlcvserie != value)
            {
                _ohlcvserie = value;
                RaisePropertyChanged("OHLCVSerie");
            }
        }
    }

    public MainWindow()
    {
        InitializeComponent();
        OHLCVSerie = new List<OHLCV>();
        OHLCVSerie = CreateRandomOHLCV(1, new DateTime(2016, 1, 1, 9, 0, 0), 4000, 100);
        this.DataContext = new
        {
            OHLCVSerie,
        };
    }

    /// <summary>
    /// Generate a random serie following usual index distribution parameters
    /// </summary>
    /// <param name="MinuteStep">number of minutes between each tick</param>
    /// <param name="StartDate">starting date</param>
    /// <param name="StartValue">starting value at tick 0</param>
    /// <param name="N">Number of ticks</param>
    /// <returns></returns>
    public List<OHLCV> CreateRandomOHLCV(int MinuteStep, DateTime StartDate, double StartValue, int N)
    {
        List<OHLCV> RandomOHLCV = new List<OHLCV>();

        //whatever code that create my random list

        return RandomOHLCV;
    }

    private void Button_Click(object sender, RoutedEventArgs e)
    {
        OHLCVSerie = CreateRandomOHLCV(1, new DateTime(2016, 1, 1, 9, 0, 0), 4000, 1000);
    }

如果我在自定义控件中检查列表的值，我会看到它在MainWindow的初始化时正确实现（一个值被传递，列表中有100个项目），但是当它没有更新时我点击按钮（当按钮单击创建一个包含1.000项的列表时，仍然是包含100个项目的相同列表）。

在MainWindow中更改相应列表后，如何在自定义控件中更新列表？

Answer 1

您正在将DataContext设置为OHLCVSerie的当前实例，尝试将DataContext设置为此（您的MainWindow）。

Binded属性不会在自定义控件中更新

1 个答案: