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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