访问颜色资源字典从一个值转换器 [英] Accessing colors in a resource dictionary from a value converter

问题描述

我在ResourceDictionary中定义的几种颜色。 。例如：

I defined several colors in a ResourceDictionary. e.g.:

<ResourceDictionary ...>
  <Color x:Key=Gray1>#FFF7F1F3</Color>
  <Color x:Key=Gray2>#FFDDD8DA</Color>
</ResourceDictionary>

所以，我也可以在应用到处重用它们。

So I can reuse them everywhere in application.

现在我写了一个值转换器转换成项目内部状态的相关颜色。

Now I wrote a value converter to convert the items inner state to the related color.

我怎样才能访问该值转换器的代码中定义的颜色？

How can I access the defined colors in the code of the value converter?

我首先想到的是把字典作为变频器的参数。但我不知道该如何实现这个目标。

My first thought was to pass the dictionary as converter parameter. But I don't know how to achieve that.

搜索结果问候

修改

Application.Current.Resources 不是一个选项。因为我不会有机会获得它以后。

Application.Current.Resources is not an option. Because I won't have access to it later.

推荐答案

有关使用转换器参数的讨厌的事情是，你必须添加要使用绑定每一次的文本。

The annoying thing about using a converter parameter is that you have to add that text every single time you want to use the binding.

相反，你可以使ResourceDictionary的属性在你的转换，并且设置它，当你实例化转换器。

Instead you could make the ResourceDictionary a property on your converter and set it when you instantiate the converter.

代码：

public class SomeConverter : IValueConverter
{
    private ResourceDictionary _resourceDictionary;
    public ResourceDictionary ResourceDictionary
    {
        get { return _resourceDictionary; }
        set 
        {
            _resourceDictionary = value; 
        }
    }

    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        //do your own thing using the _dict
        //var person = value as Person
        //if (person.Status == "Awesome")
        //    return _resourceDictionary["AwesomeBrush"]
        //else
        //    return _resourceDictionary["NotAwesomeBrush"];
    }

    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        throw new NotImplementedException();
    }

}

实例化并使用转换器：

instantiate and use converter:

<Window.Resources>
    <local:SomeConverter x:Key="MyConverter" >
        <local:SomeConverter.ResourceDictionary>
            <ResourceDictionary Source="SomeRandomResourceDictionary.xaml" />
        </local:SomeConverter.ResourceDictionary>
    </local:SomeConverter>
</Window.Resources>

...

<StackPanel Background="{Binding CurrentPerson, Converter={StaticResource MyConverter}}" >
</StackPanel>

这篇关于访问颜色资源字典从一个值转换器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！