我可以从 DataTemplate 中绑定到视图模型吗？

Answer 1

让我向您展示一个使用值转换器的示例。在此示例中，依赖于

Foo

是

string

或可以使用

ToString()

，但您也许可以将其应用到您的案例中。

public class  StringToColorDictionary : Dictionary<string, Color>
{
}

public class ObjectToColorConverter : IValueConverter
{
    public StringToColorDictionary Colors { get; set; } = new();

    public object Convert(object value, Type targetType, object parameter, string language)
    {
        return
            value.ToString() is string stringValue &&
            Colors.TryGetValue(stringValue, out var color)
                ? new SolidColorBrush(color)
                : new SolidColorBrush(Microsoft.UI.Colors.Transparent);
    }

    public object ConvertBack(object value, Type targetType, object parameter, string language)
    {
        throw new NotImplementedException();
    }
}

<Page.Resources>
    <local:ObjectToColorConverter x:Key="ObjectToColorConverter">
        <local:ObjectToColorConverter.Colors>
            <local:StringToColorDictionary>
                <Color x:Key="A">Red</Color>
                <Color x:Key="B">Green</Color>
                <Color x:Key="C">Blue</Color>
            </local:StringToColorDictionary>
        </local:ObjectToColorConverter.Colors>
    </local:ObjectToColorConverter>
    <DataTemplate
        x:Key="ItemTemplate"
        x:DataType="local:Item">
        <TextBlock
            Foreground="{x:Bind Foo, Converter={StaticResource ObjectToColorConverter}}"
            Text="{x:Bind Foo}" />
    </DataTemplate>
</Page.Resources>

<ListView
    ItemTemplate="{StaticResource ItemTemplate}"
    ItemsSource="{x:Bind ViewModel.Items, Mode=OneWay}" />