具有属性的ValueConverter [英] ValueConverter with properties

问题描述

延伸以下问题:

在IValueConverter类中定义属性

我的问题是:

在xaml文件中，TrueValue设置为单个值:

In the xaml file, TrueValue is set to a single value:

<CheckBox IsChecked="{Binding item, Converter={converter:ValueConverterWithProperties TrueValue=5}}"></CheckBox>

是否可以将ValueConverter中的属性绑定到某种列表? 绑定表达式看起来如何?

Is it possible to bind a property in a ValueConverter to some kind of List? How would the binding expression look like?

推荐答案

您可以在转换器类中声明依赖项属性，将转换器声明为静态资源，然后将该属性绑定到视图模型属性.

You can declare a dependency property in the converter class, declare your converter as static resource and bind the property to a view model property.

这将起作用:

<Window x:Class="..."
        x:Name="_this" 
        ...>
<Window.Resources>
    <local:DepPropConverter x:Key="Convert"
        MyList="{Binding DataContext.YourListInViewmodel, Source={x:Reference _this}}"/>
</Window.Resources>
<CheckBox IsChecked="{Binding item, Converter={StaticResource Converter}}"></CheckBox>

转换器:

public class DepPropConverter : DependencyObject, IValueConverter
{
    public static readonly DependencyProperty MyListProperty =
        DependencyProperty.Register(
            nameof(MyList), typeof(IList), typeof(DepPropConverter));

    public IList MyList
    {
        get { return (IList)GetValue(MyListProperty); }
        set { SetValue(MyListProperty, value); }
    }

    public object Convert(
        object value, Type targetType, object parameter, CultureInfo culture)
    {
        //your logic here
        return value;
    }

    public object ConvertBack(
        object value, Type targetTypes, object parameter, CultureInfo culture)
    {
        //your logic here
        return value;
    }
}

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