.net - 如何在值不等于的情况下使用数据触发器

Question

I have a Column 'Delivery Boy' in a data grid which is bind with a list in code behind. Values of DataGrid change dynamically.

<DataTrigger Binding="{Binding Path=delivery_boy}" Value="Not Assigned">
   <Setter Property="Foreground" Value="DarkRed"/>
   <Setter Property="Background" Value="Transparent"/>
</DataTrigger>

I can use 'Value' equals to in data trigger, how can I use data trigger for a case where I want the 'Value' property to be 'not equal to'

<DataTrigger Binding="{Binding Path=delivery_boy}" Value!="Not Assigned">
    <Setter Property="Foreground" Value="White"/>
    <Setter Property="Background" Value="Green"/>
</DataTrigger>

Answer 1

不知道为什么这会被否决，这是一个完全有效的问题。

通常，您通过在样式中分配默认 setter 然后仅使用 DataTriggers 来覆盖它们以响应特定值来实现此目的，即:

<Style>
    <Setter Property="Foreground" Value="White"/>  <!-- Default value -->
    <Setter Property="Background" Value="Green"/>  <!-- Default value -->

    <Style.Triggers>
        <DataTrigger Binding="{Binding Path=delivery_boy}" Value="Not Assigned">
            <Setter Property="Foreground" Value="DarkRed"/>
            <Setter Property="Background" Value="Transparent"/>
        </DataTrigger>
    </Style.Triggers>

</Style>