“选项”属性的默认值不能绑定到特定线程 [英] Default value for the 'Options' property cannot be bound to a specific thread

问题描述

我发现当我从

public class MarkdownEditorOptions : ObservableObject

至

public class MarkdownEditorOptions : INotifyPropertyChanged, DependencyObject

当我想使用依赖项属性时，出现错误

as I wanted to use dependency properties, I get the error

'Options'属性的默认值不能绑定到特定线程。 ... \Views\ShellView.xaml

Default value for the 'Options' property cannot be bound to a specific thread. ...\Views\ShellView.xaml

选项在 ShellViewModel <中声明为依赖项属性/ code>

Options is declared as a dependency property on ShellViewModel

public MarkdownEditorOptions Options
{
    get { return (MarkdownEditorOptions)GetValue(OptionsProperty); }
    set { SetValue(OptionsProperty, value); }
}

public static readonly DependencyProperty OptionsProperty =
    DependencyProperty.Register("Options", typeof(MarkdownEditorOptions), typeof(ShellViewModel), new UIPropertyMetadata(new MarkdownEditorOptions()));

出什么问题了？

推荐答案

查看以下问题

• 附加属性：设置时为 System.TypeInitializationException默认值

• Why Would a Dependency-Property Implementation Crash My Application When I Provide a Default Value?
• Attached Property: 'System.TypeInitializationException' when setting default value

您的Dependency属性不是线程安全的，这意味着它不继承自System.Windows.Freezable

将DependencyObject更改为Freezable，因为Freezable源自DependencyObject，所以它将起作用。

Your Dependency property is not thread safe, meaning that it doesn't inherit from System.Windows.Freezable.
Change DependencyObject to Freezable and it'll work since Freezable derives from DependencyObject.

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