在WPF XAML中，如何使用數據觸發器綁定文本塊中的兩個屬性？

Question

如何在wpf xaml中使用datatrigger在文本塊中綁定兩個屬性？ 下面是我的XAML代碼

<TextBlock HorizontalAlignment="Center" VerticalAlignment="Center"> 
    <TextBlock.Style> 
     <Style TargetType="TextBlock"> 
      <Style.Triggers> 
      <DataTrigger Binding="{Binding StkTypeValue}" Value="Y"> 
       <Setter Property="Text" Value="{Binding AvailableQty }" /> 
       <Setter Property="Text" Value="{Binding PrimaryUM}" /> 
      </DataTrigger> 
      </Style.Triggers> 
     </Style> 
    </TextBlock.Style> 
</TextBlock> 

Answer 1

你必須使用MultiBinding和IMultiValueConverter爲了這個目的： 試試這個：

<TextBlock.Style> 
     <Style TargetType="TextBlock"> 
      <Style.Triggers> 
       <DataTrigger Binding="{Binding StkTypeValue}" Value="Y"> 
        <Setter Property="Text"> 
        <Setter.Value> 
         <MultiBinding Converter="{StaticResource textMultiBindingConverter}"> 
         <Binding Path="AvailableQty " /> 
         <Binding Path="PrimaryUM"/> 
         </MultiBinding> 
        </Setter.Value> 
       </Setter> 
      </DataTrigger> 
      </Style.Triggers> 
     </Style> 
</TextBlock.Style> 

定義Converter的資源：

<Window.Resources> 
    <local:TextMultiBindingConverter x:Key="textMultiBindingConverter"/> 
</Window.Resources> 

而且你的Converter：

class TextMultiBindingConverter : IMultiValueConverter 
{ 
    public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture) 
    { 
     return (values[0].ToString() + values[1].ToString()); 
    } 

    public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture) 
    { 
     throw new NotSupportedException("Cannot convert back"); 
    } 
} 

Answer 2

我知道你想在DataTrigger激活時顯示兩個值。如果爲真，您可以使用MultiBinding用的StringFormat：

<TextBlock.Style> 
<Style TargetType="TextBlock"> 
    <Style.Triggers> 
     <DataTrigger Binding="{Binding StkTypeValue}" Value="Y"> 
      <Setter Property="Text"> 
       <Setter.Value> 
        <MultiBinding StringFormat="{}{0} - {1}"> 
         <Binding Path="AvailableQty" /> 
         <Binding Path="PrimaryUM" /> 
        </MultiBinding> 
       </Setter.Value> 
      </Setter> 
     </DataTrigger> 
    </Style.Triggers> 
</Style>