有条件地调整列表框项WPF

Question

我想根据用户输入填充列表框。用户输入是一个字符串数组，我在其中检查每个字符串。我处理字符串（例如更正任何拼写错误）并将字符串作为项目放在列表框中。我想为项目着色以指示我是否理解输入。我有4个条件，所以有4种颜色。

我设法在列表框中获得所需的文本，但到目前为止我没有找到解决方法如何进行着色。

这是xaml的一部分：

<Window x:Class="QuickSlide_2._0.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:c="clr-namespace:QuickSlide_2._0"
    Title="MainWindow" Height="350" Width="525" WindowStyle="None" ShowInTaskbar="True" AllowsTransparency="True" Background="DarkGray" WindowStartupLocation="CenterScreen" MinHeight="720" MinWidth="1280" Loaded="Window_Loaded">
<Grid VerticalAlignment="Center">
    <Grid.Resources>
        <c:coll_items x:Key="item"/>
    </Grid.Resources>

    --------

    <ListBox Height="468" HorizontalAlignment="Left" Margin="789,144,0,0" Name="output" VerticalAlignment="Top" Width="450" ItemsSource="{StaticResource item}">
        <ListBox.ItemTemplate>
                <DataTemplate>
                    <TextBlock Text="{Binding Path=item_text}" Background="{Binding Path=background_color}" Width="440" />
                </DataTemplate>
            </ListBox.ItemTemplate>            
    </ListBox>

    ----------
   </Grid>
</Window>

这是构建列表框的c＃代码的一部分：

public class item
{
    public string item_text {get; set;}
    public SolidColorBrush background_color {get; set;}

    public item(String item_text, SolidColorBrush background_color)
    {
        this.item_text = item_text;
        this.background_color = background_color;
    }
}

public partial class MainWindow : Window
{
    public ObservableCollection<item> coll_items;

    private void Check_input_Click(object sender, RoutedEventArgs e)
    {
        private string[] split_input;
        private string[,] Results;
        // Split the input from richtextbox into a string[] array

        TextRange textrange = new TextRange(input_dump.Document.ContentStart, input_dump.Document.ContentEnd);

        split_input = textrange.Text.Split(new[] { "\n" }, StringSplitOptions.RemoveEmptyEntries);

        // Validate the input
        Results = InputEngine.check_input(split_input);

        // The first column in results holds the string, the second holds the status
        // Add the results to the listbox
        for (int i = 0; i < Results.Length / 7; i++)
        {
            if ( Results[i,1] == 1)
            {              
                coll_items.Add(new item(Results[i,0],new SolidColorBrush(Colors.Green)));
            }
            else if ( Results[i,1] == 2)      
            {              
                coll_items.Add(new item(Results[i,0],new SolidColorBrush(Colors.Yellow)));
            }  
            else if ( Results[i,1] == 3)      
            {              
                coll_items.Add(new item(Results[i,0],new SolidColorBrush(Colors.Red)));
            }        
            else
            {
                coll_items.Add(new item(Results[i,0],new SolidColorBrush(Colors.Blue)));
            }
        }
        this.DataContext = this;

       ----------

    }    

我有几年（夜间）编程经验，但WPF很新。我可能犯了一个非常明显的错误，但请帮助我找到它。