設置ListView背景

Question

我希望用不同的畫筆設置背景，但是它不起作用。沒有錯誤，沒有警告。在我的代碼中，我希望讓ListView中的行具有不同的背景，因此，我爲ListViewItem定義了一個Style，但它現在不知道。當我調試代碼時，我可以進入本地：NumberConverter：Convert（對象值，類型targetType，對象參數，CultureInfo culture），但是，行的背景保持原有的顏色。

<UserControl x:Class="demo05_wpf02_binding.TabControl2" 
      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
      xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
      xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
      xmlns:local="clr-namespace:demo05_wpf02_binding" 
      mc:Ignorable="d" 
      d:DesignHeight="300" d:DesignWidth="300"> 

    <UserControl.Resources> 
     <Style x:Key="BookListStyle" TargetType="{x:Type ListViewItem}"> 
      <Style.Resources> 
       <LinearGradientBrush x:Key="ProfitBrush" StartPoint="0.2,0" EndPoint="0.8,1"> 
        <GradientStop Offset="0.3" Color="LavenderBlush" /> 
        <GradientStop Offset="0.7" Color="CornflowerBlue" /> 
       </LinearGradientBrush> 

       <LinearGradientBrush x:Key="LossBrush" StartPoint="0.2,0" EndPoint="0.8,1"> 
        <GradientStop Offset="0.3" Color="LightYellow" /> 
        <GradientStop Offset="0.7" Color="LightGoldenrodYellow" /> 
       </LinearGradientBrush> 

       <local:NumberConverter x:Key="numConverter" /> 
      </Style.Resources> 

      <Style.Triggers> 
       <DataTrigger Binding="{Binding Title, Converter={StaticResource numConverter}}" Value="0" > 
        <Setter Property="Background" Value="{StaticResource ProfitBrush}" /> 
       </DataTrigger> 
       <DataTrigger Binding="{Binding Title, Converter={StaticResource numConverter}}" Value="1" > 
        <Setter Property="Background" Value="{StaticResource LossBrush}" /> 
       </DataTrigger> 
      </Style.Triggers> 

     </Style> 
    </UserControl.Resources> 

    <DockPanel> 
     <ListView Name="ListView01" ItemContainerStyle="{StaticResource BookListStyle}" ItemsSource="{Binding}" Margin="5"> 
      <ListView.View> 
       <GridView> 
        <GridViewColumn Header="Title" DisplayMemberBinding="{Binding Title}" Width="80" /> 
        <GridViewColumn Header="Publisher" DisplayMemberBinding="{Binding Publisher}" Width="100" /> 
        <GridViewColumn Header="ISBN" DisplayMemberBinding="{Binding ISBN}" Width="100" /> 
       </GridView> 
      </ListView.View> 
     </ListView> 
    </DockPanel> 
</UserControl> 

Answer 1

你的問題必須躺在你Converter。如果您刪除了Converter，那麼如果您的數據項有Title的值爲1和0，那麼您的XAML將正常工作，因爲它的值爲。

<Style x:Key="BookListStyle" TargetType="{x:Type ListViewItem}"> 
    <Style.Resources> 
     <LinearGradientBrush x:Key="ProfitBrush" StartPoint="0.2,0" EndPoint="0.8,1"> 
      <GradientStop Offset="0.3" Color="LavenderBlush" /> 
      <GradientStop Offset="0.7" Color="CornflowerBlue" /> 
     </LinearGradientBrush> 
     <LinearGradientBrush x:Key="LossBrush" StartPoint="0.2,0" EndPoint="0.8,1"> 
      <GradientStop Offset="0.3" Color="LightYellow" /> 
      <GradientStop Offset="0.7" Color="LightGoldenrodYellow" /> 
     </LinearGradientBrush> 
    </Style.Resources>    
    <Style.Triggers> 
     <DataTrigger Binding="{Binding Title}" Value="0" > 
      <Setter Property="Background" Value="{StaticResource ProfitBrush}" /> 
     </DataTrigger> 
     <DataTrigger Binding="{Binding Title}" Value="1" > 
      <Setter Property="Background" Value="{StaticResource LossBrush}" /> 
     </DataTrigger> 
    </Style.Triggers>    
</Style> 

所以密切關注的代碼在你的Converter ......把一個斷點和單步執行代碼，直到你找到你的問題。還有一點需要注意的是，您的LossBrush很難看到...也許更強的顏色會有所幫助，即使只在測試時使用。