列表框项目WPF，不同的背景颜色为不同的项目 [英] Listbox item WPF, different background color for different items

问题描述

我有一个包含从我有一个特定的类项目的绑定列表中的WPF列表框。事情是这样的：

I have a WPF ListBox containing a binded list of items from a specific class that I have. Something like this:

    ObservableCollection<MyTable> tables = new ObservableCollection<MyTable>();
...
    listTables.ItemsSource = tables;

和XAML中：

<ListBox HorizontalAlignment="Left" Margin="8,10,0,0" Name="listTables" Width="153" ItemsSource="{Binding tables}" SelectionChanged="listTables_SelectionChanged" Height="501" VerticalAlignment="Top">
        <ListBox.ItemTemplate>
            <DataTemplate>
                <Grid Margin="1">
                    <TextBlock Grid.Column="1" Text="{Binding tableName}" />
                </Grid>
            </DataTemplate>
        </ListBox.ItemTemplate>
    </ListBox>

一切工作正常。我想现在要做的就是必须在视类的某些属性ListBox中的每个项目不同的背景。例如，假设该MyTable的类有一个isOccupied属性。如果该标志设置为某一个项目，我希望它有ListBox中的红色背景，如果不是的话，那么我想用绿色的背景有它。如果属性的变化，那么背景应该随之改变。

All works fine. What I want to do now is have a different background for each item in the ListBox depending on a certain property of the class. For example, let's say that the MyTable class has a property called isOccupied. If this flag is set for a certain item, I want it to have a red background in the ListBox, if it's not, then I want to have it with a green background. If the property changes, then the background should change accordingly.

这是如何实现这一目标的任何提示？我抬头的那一刻就ItemContainerStyle一些资料，但我是比较新的这个，所以我不知道如果我下面的正确的道路。

Any tips on how to achieve this? I'm looking up some information regarding ItemContainerStyle at the moment but I'm relatively new to this so I'm not sure if I'm following the right path.

推荐答案

您可以实现，使用 DataTrigger 取值

You can achieve that using DataTriggers

<ListBox.ItemTemplate>
    <DataTemplate>

        <!-- Step #1: give an x:Name to this Grid -->
        <Grid Margin="1" x:Name="BackgroundGrid">
            <TextBlock Grid.Column="1" Text="{Binding tableName}" />
        </Grid>

        <!-- Step #2: create a DataTrigger that sets the Background of the Grid, depending on the value of IsOccupied property in the Model -->             
        <DataTemplate.Triggers>
            <DataTrigger Binding="{Binding IsOccupied}" Value="True">
                <Setter TargetName="BackgroundGrid" Property="Background" Value="Red"/>
            </DataTrigger>

            <DataTrigger Binding="{Binding IsOccupied}" Value="False">
                <Setter TargetName="BackgroundGrid" Property="Background" Value="Green"/>
            </DataTrigger>
        </DataTemplate.Triggers>
    </DataTemplate>
</ListBox.ItemTemplate>

请记住，如果你期待着这些价值在运行时改变，你的数据项必须正确实施和提高属性改变通知：

Keep in mind that if you expect these values to change at runtime, your data item must properly implement and raise Property Change Notifications:

public class MyTable: INotifyPropertyChanged //Side comment: revise your naming conventions, this is not a table.
{
   private bool _isOccupied;
   public bool IsOccupied
   {
       get { return _isOccupied; }
       set
       {
           _isOccupied = value;
           NotifyPropertyChange("IsOccupied");
       }
    }

    //.. Other members here..
}

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