将静态资源绑定到 WPF 中的现有值 [英] Binding a static resource to an existing value in WPF

问题描述

我想简化 WPF 中的绑定.比如说，我在 App.xaml 中创建了一个 FontFamily 资源，它绑定到应用程序设置中的一个字符串值，以避免在每个窗口中出现一长串绑定表达式.但我发现我找不到办法做到这一点.

I want to simplify bindings in WPF. Say, I'm creating a FontFamily resource in App.xaml which binds to a string value in the application settings, to avoid a long line of binding expression in every window. But I found that I couldn't find a way to do that.

据说 XAML 2009 中有一个 x:Arguments，但这在此处不适用.

It is said that there's a x:Arguments in XAML 2009, but that does not apply here.

我的方法:

<DynamicResource x:Key="PrimaryFont" ResourceKey="{Binding PrimaryFont, Source={x:Static properties:Settings.Default}, Converter={StaticResource StringToFontFamilyConverter}}"/>

失败，抛出一个 XamlParseException.

<FontFamily x:Key="PrimaryFont">
    <Binding Path="PrimaryFont" Source="{x:Static properties:Settings.Default}" Converter="{StaticResource StringToFontFamilyConverter}"/>
</FontFamily>

这甚至无法编译.

我不想在后面的代码中添加它，因为我不想让一切看起来一团糟.这可能吗?

I don't want to add that in code behind, because I don't want to make everything look like a mess. Is that possible?

这不是设置全局字体系列的副本.FontFamily 仅用于解释目的，在现实世界中，我想要简化绑定的元素不止一种，并且该元素可能不是新样式的好目标.

this is not a duplicate of Setting global font family. The FontFamily is just for explaining purpose, in real world there will be more than one kind of element I want to simplify the binding on, and the element might not be a good target for a new style.

推荐答案

原来我在处理另一个问题的过程中找到了一个有趣的解决方案.

Turns out I found an interesting solution in the process of dealing with another problem.

这篇文章 由 @ThomasLevesque 撰写是我的救命稻草:

This awesome little proxy class mentioned in this article written by @ThomasLevesque is my life saver:

public class BindingProxy : Freezable
{
    #region Overrides of Freezable

    protected override Freezable CreateInstanceCore()
    {
        return new BindingProxy();
    }

    #endregion

    public object Data
    {
        get { return (object)GetValue(DataProperty); }
        set { SetValue(DataProperty, value); }
    }

    // Using a DependencyProperty as the backing store for Data.  This enables animation, styling, binding, etc...
    public static readonly DependencyProperty DataProperty =
        DependencyProperty.Register("Data", typeof(object), typeof(BindingProxy), new UIPropertyMetadata(null));
}

感谢 @mkoertgen 分享在 这个答案.

这篇关于将静态资源绑定到 WPF 中的现有值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！