我想改变我的图像来源:
<Image Source="{svg:SvgImage image.svg}"/>
对于在枚举属性上使用绑定的东西:
XAML:
<Resources>
<local:MyConverter x:Key="MyConverter" />
</Resources>
<Image Source="{svg:SvgImage Binding MyEnumProperty, Converter={StaticResource MyConverter}}" />
代码背后:
public enum MyEnum
{
Value1,
Value2
}
public class MyConverter: IValueConverter
{
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
var myValue = (MyEnum)(value);
switch (myValue)
{
case MyEnum.Value1:
return "image1.svg";
case MyEnum.Value2:
return "image2.svg";
default:
throw new NotImplementedException();
}
}
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
throw new NotImplementedException();
}
}
这不起作用,我怀疑这与svg:SvgImage
和Binding MyEnumProperty
在同一声明中的组合有关。
我收到以下错误:
The member "Converter" is not recognized or is not accessible.
和
The property 'Converter' was not found in type 'SvgImageExtension'.
问题:这样做的正确方法是什么?
表达方式
{svg:SvgImage Binding MyEnumProperty ...}
是无效的XAML,并且因为SvgImage是标记扩展,所以无法绑定其属性。
但是,您可以在图像样式中使用DataTriggers而不是使用转换器绑定:
<Image>
<Image.Style>
<Style TargetType="Image">
<Style.Triggers>
<DataTrigger Binding="{Binding MyEnumProperty}" Value="Value1">
<Setter Property="Source" Value="{svg:SvgImage image1.svg}"/>
</DataTrigger>
<DataTrigger Binding="{Binding MyEnumProperty}" Value="Value2">
<Setter Property="Source" Value="{svg:SvgImage image2.svg}"/>
</DataTrigger>
</Style.Triggers>
</Style>
</Image.Style>
</Image>