WPF XAML - DataTriggers or ValueConverters? Best practice

问题

I have a Window with a TextBlock. This TextBlock has to show the value "R" if the binded value is 0 or "M" if the binded value is 1.

I have two possibilities:

ValueConverter approach

<TextBlock Binding="{Binding Path=Value, Converter={StaticResource valConverter}}"/>

Where valConverter is an IValueConverter class that returns "M" or "R" if the value is respectively 0 or 1.

[omitted class]

DataTrigger approach

<TextBlock>
    <TextBlock.Style>
        <Style>
            <Style.Triggers>
                <DataTrigger Binding="{Binding Path=Value}" Value="0">
                    <Setter Property="TextBlock.Text" Value="R"/>
                </DataTrigger>
                <DataTrigger Binding="{Binding Path=Value}" Value="1">
                    <Setter Property="TextBlock.Text" Value="M"/>
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </TextBlock.Style>
</TextBlock>

According to you, what is the best approach?

回答1:

Converters are Best in this scenario. As the name indicates converter converts the type. In this case you want to convert int to Char, so converters are much suitable. For More Info : ConverterPerformance

回答2:

In most of the scenarios triggers can perform the same work as any converter but Converters can have custom/business logic.

One limitation of Triggers is that Setters in your DataTriggers can only change properties of your UI elements; so, you can't update your ViewModels property with triggers, that's where Converters win, remember the ConvertBack method.

So in short Triggers can only perform OneWay operations whereas Converters can perform TwoWay operations

来源：https://stackoverflow.com/questions/24607952/wpf-xaml-datatriggers-or-valueconverters-best-practice

标签

wpf

xaml

datatrigger

valueconverter