问题描述
<Border Background="{Binding IsSelected,Converter={StaticResource SelectedToProfileBorderBackgroundConverter}}" CornerRadius="8" Width="214" Height="112">
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,CultureInfo culture)
{
throw new NotImplementedException();
}
}
<SolidColorBrush x:Key="ProfileBorderBackground" Color="#EEEEEF"/>
<SolidColorBrush x:Key="ProfileBorderSelectedBackground" Color="#EEEEEF"/>
问题是 Application.Current.Resources["ProfileBorderSelectedBackground"]
返回的是 staticResource 而不是 DynamicResource。
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。
有没有办法让 Application.Current.Resources["ProfileBorderSelectedBackground"]
返回一个 DynamicResource 而不是 StaticResource?
更新: 我需要在 Converter 中使用 switch 语句如何?
public class LatencyToColorConverter : IMultiValueConverter
{
public object Convert(object[] values,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,CultureInfo culture)
{
throw new NotImplementedException();
}
解决方法
如何改用触发器
<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>
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>
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>
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,CultureInfo culture)
{
throw new NotImplementedException();
}
}