如何为资源字典添加绑定? [英] How Can I Add a Binding to a Resource Dictionary?

问题描述

我的 UserControl 上有几个控件使用相同的可见性绑定:

I have several controls on my UserControl that use the same Visibility Binding:

<UserControl x:Class="Whatever.MyClass"
             x:Name ="TheUserControlName"
             DataContext="MyUserControlViewModel">

    <Label x:Name="MyLabel" 
           Visibility="{Binding SomeBoolean, 
               ConverterParameter={StaticResource BooleanToVisibilityConverter},
               Converter={StaticResource BooleanValueInverter}}"
       Style="{StaticResource LeftLabel}"
       Content="Template _Name"
       Target="{Binding ElementName=SomeTextBox}" />
</UserControl>

我试图将绑定添加到 UserControl.Resources 字典中:

I tried to add the binding to the UserControl.Resources dictionary:

<Binding x:Key="IsCourseVisibilityBinding"
         Path="Thing.SomeBoolean"
         ConverterParameter="{StaticResource BooleanToVisibilityConverter}"
         Converter="{StaticResource BooleanValueInverter}" /> 

...，我得到了错误:

... and I get the error:

不能在类型的值"属性上设置绑定"字典条目".只能在DependencyObject的DependencyProperty`

A 'Binding' cannot be set on the 'Value' property of type 'DictionaryEntry'. A 'Binding' Can only be set on a DependencyProperty of a DependencyObject`

...但是后来我想到也许我应该在资源字典中放置一个 Visibility 值...但是我也无法使它正常工作.

... but then it occured to me that maybe I should be putting a Visibility value in the resource dictionary... but I can't get that to work either.

如何重构可视性绑定，这样我只需要定义一次即可?

How can I refactor the Visibility Binding so that I only have to define it once?

推荐答案

您不能.但是您可能想使用动态资源.像这样在App.xaml中创建可见性资源:

You can't. But you may want to use dynamic resources. Create visibility resource(s) inside App.xaml like this:

<Application.Resources>
   <ResourceDictionary
      <Visibility x:Key="SomeVisibility">Visible</Visibility>
   </ResourceDictionary>
</Application.Resources>

要在XAML的任何位置绑定到此可见性，

To bind to this visibility anywhere from XAML:

<Button Content="Some button" Visibility="{DynamicResource SomeVisibility}"/>

现在要更改此资源的值，您可以在代码中的任何位置调用它:

Now to change value of this resource you can call this anywhere from code:

 Application.Current.Resources["SomeVisibility"] = Visibility.Collapsed;

编辑:实际上，如果您不希望动态资源在所有应用程序中都是全局的，则可以为它们定义动态资源.

Edit: Actually you can define dynamic resources for specific user control if you don't want them to be global in all application.

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