WPF 绑定StaticResource到控件的方法

原文:WPF 绑定StaticResource到控件的方法

资源文件内的属性能否直接通过绑定应用到控件？答案是肯定的。

比如，我们要直接把下面的<SolidColorBrush x:Key="RedBrush" Color="#FFFF0000" />直接绑定到一个TextBlock的Foreground属性。

<Application x:Class="StaticResourcesWithBinding.App"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    StartupUri="Window1.xaml">
    <Application.Resources>
<SolidColorBrush x:Key="RedBrush" Color="#FFFF0000" />
    </Application.Resources>
</Application>

办法是直接把资源文件内的Key的名字绑定到控件，

public class MyViewModel
{
public string MyResourceKey { get; private set; }
public MyViewModel(string myResourceKey)
{
MyResourceKey = myResourceKey;
}
}

直接绑定可以吗？

<Window x:Class="StaticResourcesWithBinding.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
   Title="Window1" Width="400" Height="200">
<Grid>
<TextBlock Text="Hello World" FontSize="48" Foreground="{StaticResource  {Binding MyResourceKey}}" />
</Grid>
</Window>

但这样是行不通的。

必须要用下面的类进行转换

using System;
using System.Windows;
using System.Windows.Data;
using System.Windows.Markup;namespace StaticResourcesWithBinding
{public class BindableStaticResource : StaticResourceExtension{private static readonly DependencyProperty DummyProperty;static BindableStaticResource(){DummyProperty = DependencyProperty.RegisterAttached("Dummy",typeof(Object),typeof(DependencyObject),new UIPropertyMetadata(null));}public Binding MyBinding { get; set; }public BindableStaticResource(){}public BindableStaticResource(Binding binding){MyBinding = binding;}public override object ProvideValue(IServiceProvider serviceProvider){var target = (IProvideValueTarget)serviceProvider.GetService(typeof(IProvideValueTarget));var targetObject = (FrameworkElement)target.TargetObject;MyBinding.Source = targetObject.DataContext;var DummyDO = new DependencyObject();BindingOperations.SetBinding(DummyDO, DummyProperty, MyBinding);ResourceKey = DummyDO.GetValue(DummyProperty);return ResourceKey != null ? base.ProvideValue(serviceProvider) : null;}public new object ResourceKey{get{return base.ResourceKey;}set{if (value != null){base.ResourceKey = value;}}}}
}

然后，我们就可以通过以下方式绑定了：

<Window x:Class="StaticResourcesWithBinding.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:StaticResourcesWithBinding="clr-namespace:StaticResourcesWithBinding"
    Title="Window1" Width="400" Height="200">
<Grid>
<TextBlock Text="Hello World" FontSize="48" Foreground="{StaticResourcesWithBinding:BindableStaticResource {Binding MyResourceKey}}" />
</Grid>
</Window>

后面的代码：

public partial class Window1
{
public Window1()
{
            this.DataContext = new MyViewModel("RedBrush");
InitializeComponent();
            
}
}

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