[英]Return DynamicResource in IValueConverter
I'm using my custom converter in my control's background.我在控件的背景中使用我的自定义转换器。
<Border Background="{Binding IsSelected, Converter={StaticResource SelectedToProfileBorderBackgroundConverter}}" CornerRadius="8" Width="214" Height="112">
My converter will return a brush from the resourcedictionary that I declared.我的转换器将从我声明的资源字典中返回一个画笔。
public class SelectedToProfileBorderBackgroundConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
bool status = (bool)value;
if (status)
{
return Application.Current.Resources["ProfileBorderSelectedBackground"];
}
else
{
return Application.Current.Resources["ProfileBorderBackground"];
}
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
throw new NotImplementedException();
}
}
<SolidColorBrush x:Key="ProfileBorderBackground" Color="#EEEEEF"/>
<SolidColorBrush x:Key="ProfileBorderSelectedBackground" Color="#EEEEEF"/>
The problem is Application.Current.Resources["ProfileBorderSelectedBackground"]
return a staticResource instead of DynamicResource.问题是
Application.Current.Resources["ProfileBorderSelectedBackground"]
返回一个 staticResource 而不是 DynamicResource。
So if I change the value of ProfileBorderSelectedBackground
through a change in theme that user selected, the border background is not changed.因此,如果我通过更改用户选择的主题来更改
ProfileBorderSelectedBackground
的值,则边框背景不会更改。
Is there a way to let Application.Current.Resources["ProfileBorderSelectedBackground"]
return a DynamicResource instead of StaticResource?有没有办法让
Application.Current.Resources["ProfileBorderSelectedBackground"]
返回 DynamicResource 而不是 StaticResource?
Updated: How about I need to use switch statement in Converter?更新:我需要在 Converter 中使用 switch 语句怎么样?
public class LatencyToColorConverter : IMultiValueConverter
{
public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
{
bool status = (bool)values[1];
if (status)
{
return new SolidColorBrush(Color.FromRgb(255, 255, 255));
}
else
{
long latency = (long)values[0];
switch (latency)
{
case 0:
case -1:
return new SolidColorBrush(Color.FromRgb(195, 13, 35));
case -2:
return new SolidColorBrush(Color.FromRgb(158, 158, 159));
default:
if (latency < 1000)
{
return new SolidColorBrush(Color.FromRgb(17, 178, 159));
}
else
{
return new SolidColorBrush(Color.FromRgb(242, 150, 0));
}
}
}
}
public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
{
throw new NotImplementedException();
}
How about using triggers instead改用触发器怎么样
<Border.Style>
<Style TargetType="Border">
<Setter Property="Background" Value="{DynamicResource ProfileBorderBackground}"/>
<Style.Triggers>
<DataTrigger Binding="{Binding IsSelected}" Value="True">
<Setter Property="Background" Value="{DynamicResource ProfileBorderSelectedBackground}"/>
</DataTrigger>
</Style.Triggers>
</Style>
</Border.Style>
If you don't use DynamicResource
如果您不使用
DynamicResource
<Border CornerRadius="8" Width="214" Height="112">
<Border.Background>
<!--your Converter-->
<MultiBinding Converter="{StaticResource LatencyToColorConverter}">
<MultiBinding.Bindings>
<Binding Path="latency"/>
<Binding Path="IsSelected"/>
</MultiBinding.Bindings>
</MultiBinding>
</Border.Background>
</Border>
Triggers Version触发器版本
<Border.Style>
<Style TargetType="Border">
<!--Default Background-->
<Setter Property="Background" Value="#000000"/>
<Style.Triggers>
<DataTrigger Binding="{Binding latency,Converter={StaticResource cvtLatencyBackground}}" Value="0">
<!--Value="{DynamicResource XXXX}"-->
<Setter Property="Background" Value="#FFFFFF"/>
</DataTrigger>
<DataTrigger Binding="{Binding latency,Converter={StaticResource cvtLatencyBackground}}" Value="1">
<Setter Property="Background" Value="#C30D23"/>
</DataTrigger>
<DataTrigger Binding="{Binding latency,Converter={StaticResource cvtLatencyBackground}}" Value="2">
<Setter Property="Background" Value="#11B29F"/>
</DataTrigger>
<DataTrigger Binding="{Binding latency,Converter={StaticResource cvtLatencyBackground}}" Value="3">
<Setter Property="Background" Value="#F29600"/>
</DataTrigger>
<DataTrigger Binding="{Binding IsSelected}" Value="True">
<Setter Property="Background" Value="#FFFFFF"/>
</DataTrigger>
</Style.Triggers>
</Style>
</Border.Style>
The Converter转换器
public class LatencyBackgroundConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
if (value == null || !int.TryParse(value.ToString(), out int latency)) return -1;
switch (latency)
{
case 0:
case -1:
return 0;
case -2:
return 1;
default:
if (latency < 1000)
{
return 2;
}
else
{
return 3;
}
}
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
throw new NotImplementedException();
}
}
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