WPF 使用绑定分配静态资源 [英] WPF use binding to assign static resource

问题描述

我正在尝试使用枚举来显示相应的图像.为此，我有一个值转换器，可将枚举转换为正确的资源名称.我的资源定义如下:

I am trying to use an enum to display a corresponding image. For this I have a value converter that converts an enum to the correct resource name. My resources are defined as follows:

<UserControl.Resources>
    <BitmapImage x:Key="AlarmCat1" UriSource="/Lib.Infrastructure;component/Resources/msg_cat1.bmp" />
    <BitmapImage x:Key="AlarmCat2" UriSource="/Lib.Infrastructure;component/Resources/msg_cat2.bmp" />
    <BitmapImage x:Key="AlarmCat3" UriSource="/Lib.Infrastructure;component/Resources/msg_cat3.bmp" />
    <converters:JamCategoryToImageConverter x:Key="AlarmCategoryConverter" />
</UserControl.Resources>

这有效:

<Image Source="{StaticResource AlarmCat1}" />

但这不是，转换器被调用并传回正确的值.正确的语法是什么?

But this doesn't, the converter is called and the correct value is passed back. What is the correct syntax?

<Image Source="{StaticResource { Binding CurrentAlarmItem.AlarmCategory, Converter={StaticResource AlarmCategoryConverter}}}" />

为了完整起见，这是转换函数:

For completeness, this is the convert function:

public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
    switch ((AlarmCategory)value)
    {
        case AlarmCategory.Category1:
            return "AlarmCat1";
        case AlarmCategory.Category2:
            return "AlarmCat2";
        case AlarmCategory.Category3:
            return "AlarmCat3";
        default:
            return null;
    }
}

推荐答案

我会返回转换器中的资源:

I would return the resource in the converter:

<Image Source="{Binding CurrentAlarmItem.AlarmCategory, Converter={StaticResource AlarmCategoryConverter}}" />

在您的转换器中执行以下操作:

In your converter do something like this:

return Application.Current.FindResource("AlarmCat1") as BitmapImage;

使用资源字典 (app.xaml) 为整个应用程序设置资源

Set your resources for the complete application with the use of resourcedictionary (app.xaml)

<Application.Resources>
    <ResourceDictionary>
        <ResourceDictionary.MergedDictionaries>
            <ResourceDictionary Source="Dictionary1.xaml" />
        </ResourceDictionary.MergedDictionaries>
    </ResourceDictionary>
</Application.Resources>

在你的字典中 (Dictionary1.xaml)

In your Dictionary (Dictionary1.xaml)

<BitmapImage x:Key="AlarmCat1" UriSource="bh.jpg" />

因为您的资源现在是在应用程序级别定义的，所以代码现在将找到您的资源并将其返回.

Because your resources are now defined on applicationlevel, the code will now find your resource and give it back.

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