c# - UWP 无法分配给自定义控件中的属性错误

Question

我有一个自定义控件 LineChart。 xaml.cs 中的代码:

public static readonly DependencyProperty StrokeProperty =
        DependencyProperty.Register("StrokeProperty", typeof(Brush), typeof(LineChart), new PropertyMetadata(new SolidColorBrush(),
            new PropertyChangedCallback(OnItemsChanged)));

public Brush Stroke
{
    get { return (Brush)GetValue(StrokeProperty); }
    set { SetValue(StrokeProperty, value); }
}

在 View 模型类中:

public Brush Abc
{
    get { return new SolidColorBrush(new Color() {A = 123, B = 123, G = 23, R = 12 } ); }
}

在其他页面中:

<controls:LineChart  Stroke="{Binding Abc}" />

在静态代码行 Stroke="Green" 下一切正常，但是当我使用 Binding 时，程序因错误而崩溃:

Windows.UI.Xaml.Markup.XamlParseException: The text associated with this error code could not be found.

Failed to assign to property CurrencyExchangeUniversal.App.Controls.LineChart.Stroke'. [Line: 102 Position: 41] at Windows.UI.Xaml.Application.LoadComponent(Object component, Uri resourceLocator, ComponentResourceLocation componentResourceLocation) at CurrencyExchangeUniversal.App.View.NationalBankPage.InitializeComponent() at CurrencyExchangeUniversal.App.View.NationalBankPage..ctor()

Answer 1

您在 DependencyProperty.Register 调用中犯了一个错误。第一个参数值应该是 "Stroke"，而不是 "StrokeProperty":

public static readonly DependencyProperty StrokeProperty =
        DependencyProperty.Register("Stroke", typeof(Brush), typeof(LineChart), new PropertyMetadata(new SolidColorBrush(),
            new PropertyChangedCallback(OnItemsChanged)));