关于ICollectionView/CollectionView/BindingListCollectionView/ItemCollection/ListCollectionView的介绍：
https://www.cnblogs.com/tianciliangen/p/7010103.html
它们之间的关系是：
之前我写WPF实现过滤功能是从DataSource进行过滤，实现界面变化，这样效率比较低。搞清楚了下面的关系，就好些代码了：
现在讲讲从ListCollecitonView视图进行过滤的使用：
MainWindowViewModel.cs
public class MainWindowViewModel : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
private List<Student> students = new List<Student>();
public List<Student> Students
{
get { return students; }
set { students = value; }
}
private string nameFilterStr;
public string NameFilterStr
{
get { return nameFilterStr; }
set
{
nameFilterStr = value;
this.PropertyChanged?.Invoke(this, new PropertyChangedEventArgs("NameFilterStr"));
StudentListView.Refresh();
}
}
private string desFilterStr;
public string DesFilterStr
{
get { return desFilterStr; }
set
{
desFilterStr = value;
this.PropertyChanged?.Invoke(this, new PropertyChangedEventArgs("DesFilterStr"));
StudentListView.Refresh();
}
}
public ListCollectionView StudentListView { get; set; }
public MainWindowViewModel()
{
StudentListView = new ListCollectionView(Students);
for (int i = 0; i < 100000; i++)
{
Students.Add(new Student() { Name = "张三"+i, Age = 1, Description = "fsfdsafds" });
Students.Add(new Student() { Name = "李四"+i, Age = 2, Description = "及王鹏飞" });
Students.Add(new Student() { Name = "王五"+i, Age = 3, Description = "都没法鲁大师南方男" });
Students.Add(new Student() { Name = "刘6"+i, Age = 4, Description = "副书记丁阿基佛尔" });
Students.Add(new Student() { Name = "鲁7"+i, Age = 5, Description = "飞达拉斯科技佛电视剧" });
}
StudentListView.Filter = Filter;
}
private bool Filter(object obj)
{
Student s = obj as Student;
if (s == null) return false;
if (string.IsNullOrEmpty(NameFilterStr) && string.IsNullOrEmpty(DesFilterStr))
{
return true;
}
else if (!string.IsNullOrEmpty(NameFilterStr) && string.IsNullOrEmpty(DesFilterStr))
{
if (s.Name.Contains(NameFilterStr))
{
return true;
}
return false;
}
else if (string.IsNullOrEmpty(NameFilterStr) && !string.IsNullOrEmpty(DesFilterStr))
{
if (s.Description.Contains(DesFilterStr))
{
return true;
}
return false;
}
else
{
if (s.Name.Contains(NameFilterStr)&&s.Description.Contains(DesFilterStr))
{
return true;
}
return false;
}
}
}
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MainWindow.xaml
<Window x:Class="ListCollectionView实现过滤功能.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:ListCollectionView实现过滤功能"
xmlns:vm="clr-namespace:ListCollectionView实现过滤功能.ViewModel"
mc:Ignorable="d"
Title="MainWindow" Height="450" Width="800">
<Window.DataContext>
<vm:MainWindowViewModel></vm:MainWindowViewModel>
</Window.DataContext>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="30"></RowDefinition>
<RowDefinition></RowDefinition>
</Grid.RowDefinitions>
<StackPanel Orientation="Horizontal" Margin="2">
<Label>名称过滤：</Label>
<TextBox Width="100" Text="{Binding NameFilterStr,Mode=TwoWay, UpdateSourceTrigger=LostFocus}"></TextBox>
<Label>描述过滤：</Label>
<TextBox Width="100" Text="{Binding DesFilterStr,Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"></TextBox>
</StackPanel>
<DataGrid ItemsSource="{Binding StudentListView}" Grid.Row="1"></DataGrid>
</Grid>
</Window>
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ListCollectionView过滤，就是调用Filter,然后告诉视图，每个元素是否显示就可以了，最后别忘记StudentListView.Refresh();