使用WPF，如何根据单元格的值更改单元格的颜色？

<DataGrid x:Name="dataGrid" AutoGenerateColumns="False">
    <DataGrid.Columns>
        <DataGridTextColumn Header="Name" Binding="{Binding Name}" />
        <DataGridTextColumn Header="Value" Binding="{Binding Value}" />
    </DataGrid.Columns>
</DataGrid>

public class DataItem
{
    public string Name { get; set; }
    public int Value { get; set; }
}

public MainWindow()
{
    InitializeComponent();

    List<DataItem> data = new List<DataItem>
    {
        new DataItem { Name = "Item 1", Value = 10 },
        new DataItem { Name = "Item 2", Value = 5 },
        new DataItem { Name = "Item 3", Value = 15 }
    };

    dataGrid.ItemsSource = data;
}

<DataGrid.Resources>
    <Style TargetType="DataGridCell">
        <Style.Triggers>
            <DataTrigger Binding="{Binding Value}" Value="10">
                <Setter Property="Background" Value="Green" />
            </DataTrigger>
            <DataTrigger Binding="{Binding Value}" Value="5">
                <Setter Property="Background" Value="Yellow" />
            </DataTrigger>
            <DataTrigger Binding="{Binding Value}" Value="15">
                <Setter Property="Background" Value="Red" />
            </DataTrigger>
        </Style.Triggers>
    </Style>
</DataGrid.Resources>