wpf 您可以在 BorderBrush 属性的绑定中使用 IValueConverter 吗？
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Can you use an IValueConverter in a binding on the BorderBrush property?
提问by Tony Vitabile
I have a class that implements IValueConverterthat is intended to be used to convert a Boolean value into a Brush. I'm trying to use the IValueConverterin a binding to the BorderBrushproperty of a BorderControl:
我有一个实现类，IValueConverter旨在用于将布尔值转换为Brush. 我试图IValueConverter在绑定到控件的BorderBrush属性时使用Border：
<Window x:Class="DomPicker.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:cc="clr-namespace:CustomControls;assembly=CustomControls"
xmlns:sys="clr-namespace:System;assembly=mscorlib"
DataContext="{Binding Path=Domains, RelativeSource={RelativeSource Self}}"
Height="350"
Title="My Title"
Width="525">
<cc:CarSystemWindow.Resources>
<cc:BooleanToBrushConverter x:Key="BrushConverter" True="Black" False="Transparent" />
<DataTemplate x:Name="DomainTemplate" DataType="DomainViewModel">
<Border BorderBrush="{Binding Converter=BrushConverter, Path=IsSelected}">
. . .
</Border>
</DataTemplate>
</cc:CarSystemWindow.Resources>
<Grid>
<ListBox . . . Name="DomainListBox" />
</Grid>
<Window>
Here is the code for the Domains property in the code behind:
以下是后面代码中 Domains 属性的代码：
public static readonly DependencyProperty DomainsProperty =
DependencyProperty.Register( "Domains", typeof( ObservableCollection<DomainViewModel> ), typeof( MainWindow ), new PropertyMetadata( null ) );
public ObservableCollection<DomainViewModel> Domains {
get { return (ObservableCollection<DomainViewModel>) GetValue( DomainsProperty ); }
set { SetValue( DomainsProperty, value ); }
}
When I compile the code, which is by no means finished, I get a compiler error on the BorderBrushbinding:
当我编译代码时，这绝不是完成，我在BorderBrush绑定上收到编译器错误：
The TypeConverter for "IValueConverter" does not support converting from a string.
Here is the code for the IValueConverter:
这是代码IValueConverter：
public class BooleanConverter<T> : IValueConverter {
public T False { get; set; }
public T True { get; set; }
public BooleanConverter( T trueValue, T falseValue ) {
// Set the values of True and false to the values we were passed.
True = trueValue;
False = falseValue;
}
public object Convert( object value, Type targetType, object parameter, CultureInfo culture ) {
return value is bool && ( (bool) value ) ? True : False;
}
public object ConvertBack( object value, Type targetType, object parameter, CultureInfo culture ) {
return value is T && EqualityComparer<T>.Default.Equals( (T) value, True );
}
}
[ValueConversion( typeof( bool ), typeof( Brush ) )]
public class BooleanToBrushConverter : BooleanConverter<Brush> {
/// <summary>
/// Set us up so we convert true to a Black <see cref="SolidColorBrush"/> and
/// false to a Red SolidColorBrush.
/// </summary>
public BooleanToBrushConverter() :
base( new SolidColorBrush( Colors.Black ), new SolidColorBrush( Colors.Red ) ) { }
}
Can anyone tell me what I'm doing wrong?
谁能告诉我我做错了什么？
回答by sa_ddam213
You need to use StaticResourceto access your converter
您需要使用StaticResource来访问您的转换器
Example:
例子：
<Border BorderBrush="{Binding IsSelected, Converter={StaticResource BrushConverter}}">
