c# - 设计器显示 A 'Binding' can only be set on a DependencyProperty of a DependencyObject 错误

Question

我创建了一个具有 DependencyProperty 的用户控件，当我尝试绑定(bind)到它时，我在设计器中遇到错误:

" 'Binding' cannot be set on the 'ROCValue' property of type 'RocIndicator'. A 'Binding' can only be set on a DependencyProperty of a DependencyObject.

编辑:我已经添加了 static 修饰符，但我仍然遇到该错误。是的，我已经重新启动了 visual studio。

public partial class RocIndicator : UserControl
{
    public static readonly DependencyProperty ROCValueProperty =
        DependencyProperty.Register("ROCValue", typeof(double), typeof(RocIndicator),
        new FrameworkPropertyMetadata(0.0, new PropertyChangedCallback(ValueChanged)));


    public double ROCValue
    {
        get { return (double)GetValue(ROCValueProperty); }
        set { SetValue(ROCValueProperty, value); }
    }
}

这是 XAML:

<View:RocIndicator ROCValue="{Binding ROC}" Margin="0,10,0,0" HorizontalAlignment="Center" Width="35"/>

但是当我构建并运行它时它会工作。为什么会显示此错误？

Answer 1

依赖属性声明必须是static:

public static readonly DependencyProperty ROCValueProperty ...