好的，您已经接受了这个问题的答案，但我仍然想展示一种不同的方法：
XAML：
<Window x:Class="WpfApplication1.ListViewSearch"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="ListViewSearch" Height="300" Width="300">
<DockPanel>
<DockPanel DockPanel.Dock="Left" Margin="2">
<Button DockPanel.Dock="Bottom" Content="Find All" Margin="2" Click="FindAll_Click"/>
<ListBox ItemsSource="{Binding Filters}"
SelectedItem="{Binding SelectedFilter}"
DisplayMemberPath="DisplayName"/>
</DockPanel>
<ListView ItemsSource="{Binding Items}">
<ListView.View>
<GridView>
<GridViewColumn DisplayMemberBinding="{Binding FirstName}" Header="First Name"/>
<GridViewColumn DisplayMemberBinding="{Binding LastName}" Header="Last Name"/>
</GridView>
</ListView.View>
<ListView.ItemContainerStyle>
<Style TargetType="ListViewItem">
<Setter Property="IsSelected" Value="{Binding IsSelected}"/>
</Style>
</ListView.ItemContainerStyle>
</ListView>
</DockPanel>
</Window>
代码后台：
public partial class ListViewSearch : Window
{
private ViewModel ViewModel;
public ListViewSearch()
{
InitializeComponent();
DataContext = ViewModel = new ViewModel();
}
private void FindAll_Click(object sender, RoutedEventArgs e)
{
ViewModel.Filter();
}
}
视图模型：
public class ViewModel
{
public ViewModel()
{
Items = new ObservableCollection<DataItem>(RandomDataSource.GetRandomData());
Filters = new ObservableCollection<DataFilter>();
Filters.Add(new DataFilter()
{
DisplayName = "First Name starting with A",
FilterExpression = x => x.FirstName.ToLower().StartsWith("a")
});
Filters.Add(new DataFilter()
{
DisplayName = "Last Name starting with E",
FilterExpression = x => x.LastName.ToLower().StartsWith("e")
});
}
public ObservableCollection<DataItem> Items { get; private set; }
public DataFilter SelectedFilter { get; set; }
public ObservableCollection<DataFilter> Filters { get; private set; }
public void Filter()
{
if (SelectedFilter == null)
return;
foreach (var item in Items)
item.IsSelected = SelectedFilter.FilterExpression(item);
}
}
数据项：
public class DataItem : INotifyPropertyChanged
{
private bool _isSelected;
public bool IsSelected
{
get { return _isSelected; }
set
{
_isSelected = value;
OnPropertyChanged("IsSelected");
}
}
public string LastName { get; set; }
public string FirstName { get; set; }
public event PropertyChangedEventHandler PropertyChanged;
protected virtual void OnPropertyChanged(string propertyName)
{
PropertyChangedEventHandler handler = PropertyChanged;
if (handler != null) handler(this, new PropertyChangedEventArgs(propertyName));
}
}
数据过滤器：
public class DataFilter
{
public Func<DataItem, bool> FilterExpression { get; set; }
public string DisplayName { get; set; }
}
随机数据源（只是一堆样板文件）
public static class RandomDataSource
{
private static string TestData = "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum";
private static List<string> words;
private static int maxword;
private static Random random;
public static List<DataItem> GetRandomData()
{
random = new Random();
words = TestData.Split(' ').ToList();
maxword = words.Count - 1;
return Enumerable.Range(0, 10000)
.Select(x => GetRandomItem())
.ToList();
}
private static DataItem GetRandomItem()
{
return new DataItem()
{
LastName = words[random.Next(0, maxword)],
FirstName = words[random.Next(0, maxword)],
};
}
}
此方法相比于传统的代码后台方法有以下优势:
- 它将UI和逻辑分离开来。你可以针对自己定义的类进行操作，而不是处理(WPF对象模型有时候很深奥难懂的)。
- 由于你的代码实际上并不依赖于任何特定的UI元素类型，所以你可以将UI更改为“3D旋转粉色大象”，它仍然能够正常工作。它使视图具有更多的可定制性，而不会影响任何代码或逻辑。
- 它易于重用(你可以创建一个
SearchViewModel<T>和一个DataFilter<T>，并在许多不同的实体类型上重用这些)。
- 它可以进行单元测试。
