是否可以在 Sealed XAML 控件类上创建附加属性? [英] Is it possible to create an Attached Property on a Sealed XAML control class?

问题描述

与旧的桌面版本不同，Windows 应用商店应用程序库中的 Run 类是密封的.我需要向它添加一个属性，当用户选择运行时我可以检索该属性.

The Run class in the Windows Store Apps libraries is SEALED, unlike the old desktop version. I need to add a property to it that I can retrieve when the user selects the Run.

是否可以将属性附加到我可以在代码中访问的密封 Run 类?

Is it possible to attach a property to the sealed Run class that I can access in code?

这是我的尝试:

public static readonly DependencyProperty MyIndexProperty =
    DependencyProperty.RegisterAttached("MyIndex", typeof(int), typeof(Run), new PropertyMetadata(null));

public static int GetMyIndex(Run obj)
{
    return (int)obj.GetValue(MyIndexProperty);
}

public static void SetMyIndex(Run obj, int value)
{
    obj.SetValue(MyIndexProperty, value);
}

推荐答案

C# 语言 不支持扩展"或附加"属性.

The C# language does not support "extension" or "attached" properties.

附加属性是影响 XAML 和 WPF 绑定系统的 WPF 功能.在代码中使用 WPF 附加属性的唯一方法是编写 YourClass.SetMyIndex(instance, value);.

Attached properties are a WPF feature which affect XAML and the WPF binding system. The only way to use a WPF attached property in code is to write YourClass.SetMyIndex(instance, value);.

没有办法完成你想要的，尽管扩展方法可以接近.

There is no way to accomplish what you want, although extension methods can come close.

这篇关于是否可以在 Sealed XAML 控件类上创建附加属性?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！