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Question

如何将字典静态数据绑定为字典键？
我的XAML代码：

<TextBlock
    x:Name="AxisXTextBlock"
    Width="37"
    Height="18"
    Margin="106,19,0,0"
    HorizontalAlignment="Left"
    VerticalAlignment="Top"
    FontFamily="Source Code Pro"
    Text="{Binding DataStructure.DictionaryOfValuesReadOnly[AXIS_X].IntValue, Mode=OneWay, UpdateSourceTrigger=PropertyChanged}"
    TextWrapping="Wrap" />

词典键的静态数据类：

public static class DataNames
{
    public static string SomeDataName { get; } = "some_data_name";
    ...
}

如何在XAML代码中将DataNames.SomeDataName绑定为我的字典的键？

更新

我使用字典转换器然后将其绑定为StaticResource

xmlns:converters="clr-namespace:AppName.Converters"
...
<converters:SomeConverter x:Key="SomeConverter " />
...
Text="{Binding Path=DataStructure, Converter={StaticResource SomeConverter}, ConverterParameter={x:Static data:DataNames.SomeDataName}}"

感谢mm8帮助解决问题。他的答案包含字典转换器的代码。

Answer 1

我担心XAML不支持这种“动态”绑定路径。

您可以使用转换器，例如：

public class DictConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        IDictionary<string, string> dict = value as IDictionary<string, string>;
        string key = parameter as string;

        string s;
        if (dict != null && !string.IsNullOrEmpty(key) && dict.TryGetValue(key, out s))
            return s;

        return null;
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        throw new NotSupportedException();
    }
}

<TextBlock Text="{Binding Path=Dict, Converter={StaticResource conv}, ConverterParameter={x:Static local:DataNames.AxisX}}" />

Answer 2

您可以使用静态标记扩展名：

<TextBlock
    x:Name="AxisXTextBlock"
    Background="Yellow"
    Width="100"
    Height="30"
    Margin="106,19,0,0"
    HorizontalAlignment="Left"
    VerticalAlignment="Top"
    FontFamily="Source Code Pro"
    Text="{Binding DataStructure.DictionaryOfValuesReadOnly[{x:Static local:DataNames.AxisX}].IntValue, Mode=OneWay, UpdateSourceTrigger=PropertyChanged}"
    TextWrapping="Wrap" />

将静态数据绑定为字典键

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2 个答案: