如何設置列表框項目的前景色

Question

我有一個WP7應用程序頁面中的列表框，我綁定到名爲位置的自定義對象的集合（列表）。在那個對象是一個名爲WMO的字段，當ListBox加載時我想要做的事情是將任何綁定的列表框項目的foregound顏色設置爲與我的默認值相同的值......但我似乎無法得到這個工作而我讀過或搜索過的東西都沒有幫助。

我知道列表中的項目都綁定到數據源，但我想要了解該項目的物理表示並更改前景色....只是不能解決我如何做到這一點，所以如果有人可以幫助我欣賞它。

<Grid x:Name="ContentPanel" Grid.Row="1" Margin="0,0,0,0" > 
    <ScrollViewer Height="615" HorizontalAlignment="Left" Margin="5,5,5,5" Name="scrollViewer1" VerticalAlignment="Top"> 
     <ListBox Name="lbxSavedLocs" Height="615" FontSize="22" HorizontalAlignment="Left" VerticalAlignment="Top" Width="470" SelectionChanged="lbxSavedLocs_SelectionChanged" Loaded="lbxSavedLocs_Loaded"> 
      <ListBox.ItemTemplate> 
       <DataTemplate> 
        <StackPanel Orientation="Horizontal"> 
         <TextBlock Width="380" Text="{Binding SiteName}" HorizontalAlignment="Left" /> 
         <TextBlock Width="90" Text="{Binding WMO}" HorizontalAlignment="Center" /> 
        </StackPanel> 
       </DataTemplate> 
      </ListBox.ItemTemplate> 
     </ListBox> 
    </ScrollViewer> 
</Grid> 

private void lbxSavedLocs_Loaded(object sender, RoutedEventArgs e) 
{ 
    //Populate the listbox from our saved locations. 
    lbxSavedLocs.ItemsSource = gl.savedLocs.OrderBy(x => x.SiteName); 

    foreach (Location itm in lbxSavedLocs.Items) 
    { 
     if (loc.WMO == gl.defaultWMO) 
     { 
      //GET AN "INVALID CAST" EXCEPTION HERE: 
      ((ListBoxItem)itm).Foreground = new SolidColorBrush(Color.FromArgb(255, 255, 255, 255)); 
     } 
    } 

    //Hopefully this produces a redraw of the ListBox. 
    lbxSavedLocs.InvalidateArrange(); 
} 

Answer 1

這裏有一個方法....我想它的工作原理

要綁定的屬性是Foreground，所以

<Grid x:Name="ContentPanel" Grid.Row="1" Margin="0,0,0,0" > 
    <ScrollViewer Height="615" HorizontalAlignment="Left" Margin="5,5,5,5" Name="scrollViewer1" VerticalAlignment="Top"> 
     <ListBox Name="lbxSavedLocs" Height="615" FontSize="22" HorizontalAlignment="Left" VerticalAlignment="Top" Width="470" SelectionChanged="lbxSavedLocs_SelectionChanged" Loaded="lbxSavedLocs_Loaded"> 
      <ListBox.ItemTemplate> 
       <DataTemplate> 
        <StackPanel Orientation="Horizontal"> 
         <TextBlock Width="380" Text="{Binding SiteName}" Foreground="{binding forgroundColor}" HorizontalAlignment="Left" /> 
         <TextBlock Width="90" Text="{Binding WMO}" Foreground="{binding forgroundColor}" HorizontalAlignment="Center" /> 
        </StackPanel> 
       </DataTemplate> 
      </ListBox.ItemTemplate> 
     </ListBox> 
    </ScrollViewer> 
</Grid> 

在忍受，你填入你的列表框右邊Forground使用選擇恰當的條件程序

使用填充類列表框中containin

class lisboxItem 
{ 
    public string SiteName{get;set;} 
    public string forgroundColor{get;set;} 
    public string WMO{get;set;} 
} 

創建List<listboxItem> items=new List<listboxItem>();

，並填寫在一個循環，你給你想要的狀態列表items。

是 通話後 lbxSavedLocs.ItemSource=items

Answer 2

試試這個：

選項1：

ListBoxItem lbi1 = (ListBoxItem)(listBox.ItemContainerGenerator.ContainerFromIndex(0)); 
lbi1.Foreground= new SolidColorBrush(Color.FromArgb(100, 45, 23, 45)); 

選項2：

ListBoxItem lbi2 = (ListBoxItem)(listBox.ItemContainerGenerator.ContainerFromItem(listBox.Items.SelectedItem)); 

lbi2.Foreground= new SolidColorBrush(Colors.Red); 

Answer 3

如果您需要將相同的前景色適用於所有項目在ListBox或綁定fo將顏色重新調整爲數據項中的值，則最佳方法是修改ItemContainerStyle。該ItemContainerStyle限定圍繞ItemTemplate的，默認情況下內容的視覺包裝使用ContentControl，您可以設置或綁定Foreground屬性：

 <Style x:Key="ListBoxItemStyle1" TargetType="ListBoxItem"> 
      <Setter Property="Background" Value="Transparent"/> 
      <Setter Property="BorderThickness" Value="0"/> 
      <Setter Property="BorderBrush" Value="Transparent"/> 
      <Setter Property="Padding" Value="0"/> 
      <Setter Property="HorizontalContentAlignment" Value="Left"/> 
      <Setter Property="VerticalContentAlignment" Value="Top"/> 
      <Setter Property="Template"> 
       <Setter.Value> 
        <ControlTemplate TargetType="ListBoxItem"> 
         <Border x:Name="LayoutRoot" 
           BorderBrush="{TemplateBinding BorderBrush}" 
           BorderThickness="{TemplateBinding BorderThickness}" 
           Background="{TemplateBinding Background}" 
           HorizontalAlignment="{TemplateBinding HorizontalAlignment}" 
           VerticalAlignment="{TemplateBinding VerticalAlignment}"> 
          <VisualStateManager.VisualStateGroups> 
           <VisualStateGroup x:Name="CommonStates"> 
            <VisualState x:Name="Normal"/> 
            <VisualState x:Name="MouseOver"/> 
            <VisualState x:Name="Disabled"> 
             <Storyboard> 
              <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Background" 
                      Storyboard.TargetName="LayoutRoot"> 
               <DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource TransparentBrush}"/> 
              </ObjectAnimationUsingKeyFrames> 
              <DoubleAnimation Duration="0" 
                  To=".5" 
                  Storyboard.TargetProperty="Opacity" 
                  Storyboard.TargetName="ContentContainer"/> 
             </Storyboard> 
            </VisualState> 
           </VisualStateGroup> 
           <VisualStateGroup x:Name="SelectionStates"> 
            <VisualState x:Name="Unselected"/> 
            <VisualState x:Name="Selected"/> 
           </VisualStateGroup> 
          </VisualStateManager.VisualStateGroups> 
          <ContentControl x:Name="ContentContainer" 
              ContentTemplate="{TemplateBinding ContentTemplate}" 
              Content="{TemplateBinding Content}" 
              Foreground="#FFFF0000" 
              HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}" 
              Margin="{TemplateBinding Padding}" 
              VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}" Background="Black"/> 
         </Border> 
        </ControlTemplate> 
       </Setter.Value> 
      </Setter> 
     </Style>