使用文本框搜索在WPF中创建Listview筛选器

Question

我正在创建一个带有名为star.XML的XML文件的应用程序，以将我的数据存储在列表视图中。我对c#和编程很陌生，需要任何帮助基本上，我希望能够在我的搜索文本框中键入（称为"搜索"），并且我的列表视图（lstStar）只显示匹配的记录。也就是说，输入"奥迪"只会返回这些项目。任何帮助都将不胜感激jen

namespace StarinCar
{
    public partial class MainWindow : Window
    {
        int hot = -2;
        int Mildly_Moist = -2;
        int Wet = -4;
        int Very_Wet = -6;
        private ObservableCollection<star> starData;
        public MainWindow()
        {
            InitializeComponent();
            starData = new ObservableCollection<star>();
            lstStar.ItemsSource = starData;
            try
            {
                XmlSerializer xs = new XmlSerializer(typeof(ObservableCollection<star>));
                using (StreamReader rd = new StreamReader("star.xml"))
                {
                    starData = xs.Deserialize(rd) as ObservableCollection<star>;
                }
            }
            catch
            {
            }
            lstStar.ItemsSource = starData;
            lblAverage.Content = starData.Average(i => i.time).ToString();
            lblFastest.Content = starData.Min(i => i.time).ToString();
            lblSlowest.Content = starData.Max(i => i.time).ToString();
        }
        private void btnAdd_Click(object sender, RoutedEventArgs e)
        {
            star newStar = new star();
            newStar.firstName = txtName.Text;
            newStar.time = int.Parse(txtTime.Text);  
            newStar.car = txtCar.Text;
            newStar.track = txtTrack.Text;
            starData.Add(newStar);
            if (txtTrack.Text.Contains("Hot") || (txtTrack.Text.Contains("hot") == true))
            {
                newStar.time = int.Parse(txtTime.Text) + hot;
            }
            if (txtTrack.Text.Contains("Mildly Moist") || (txtTrack.Text.Contains("mildly moist")) == true)
            {
                newStar.time = int.Parse(txtTime.Text) + Mildly_Moist;
            }
            if (txtTrack.Text.Contains("Wet") || (txtTrack.Text.Contains("wet") == true))
            {
                newStar.time = int.Parse(txtTime.Text) + Wet;
            }
            if (txtTrack.Text.Contains("Very Wet") || (txtTrack.Text.Contains("very wet")) == true)
            {
                newStar.time = int.Parse(txtTime.Text) + Very_Wet;
            }
        }
        private void Window_Closed(object sender, EventArgs e)
        {
            XmlSerializer xs = new XmlSerializer(typeof(ObservableCollection<star>));
            using (StreamWriter wr = new StreamWriter("star.xml"))
            {
                xs.Serialize(wr, starData);
            }
        }
    }
}

Answer 1

您可以使用ICollectionView。所以你会有你的"整体"star集合"starData"。但是你的列表框项目源会绑定到这样的东西：

public ICollectionView FilteredStars
    {
        get
        {
            ICollectionView source = CollectionViewSource.GetDefaultView(starData);
            source.Filter = new Predicate<object>(FilterStars);
            return source;
        }
    }

在这里进行过滤的逻辑：

private bool FilterStars(object item)
    {
        bool b = false;
        star a = item as star;
        if (a != null)
        {
            if (a.Name.Contains(searchBoxText))  //your filter logic here
            {
                   b = true;
            }
            else if String.IsNullOrWhiteSpace(searchBoxText)
            {
                   b = true;
            }
        }
        return b;
    }

基本上，你有你的主集合，然后有一些逻辑将你的主收藏筛选成一个筛选过的集合，这就是你应该将列表框的itemsource设置为的。到目前为止，这是假设你要在搜索文本框中放入某种属性更改，然后可能单击一个按钮，比如"搜索"，然后告诉列表进行检查并重新填充以匹配搜索项。

Answer 2

这就是我在类似应用程序中的过滤方式

    public IEnumerable<string> PastEntries1
    {
        get
        {
            if(string.IsNullOrEmpty(textValue))
            {
                return FieldDefString.PastEntries;
            }
            else 
            {
                return FieldDefString.PastEntries.Where(x => x.StartsWith(textValue, StringComparison.OrdinalIgnoreCase));
            }
        }
    }