基于MVVM模式，根据TextBox和CheckBox对WPF DataGrid进行过滤

以下是一个基于MVVM模式，使用TextBox和CheckBox对WPF DataGrid进行过滤的解决方法的示例代码：

首先，创建一个名为FilterViewModel的视图模型类，用于处理过滤逻辑和与视图的交互：

public class FilterViewModel : INotifyPropertyChanged
{
    private ObservableCollection<ItemModel> items;
    public ObservableCollection<ItemModel> Items
    {
        get { return items; }
        set
        {
            items = value;
            OnPropertyChanged(nameof(Items));
        }
    }

    private string filterText;
    public string FilterText
    {
        get { return filterText; }
        set
        {
            filterText = value;
            ApplyFilter();
            OnPropertyChanged(nameof(FilterText));
        }
    }

    private bool showOnlyChecked;
    public bool ShowOnlyChecked
    {
        get { return showOnlyChecked; }
        set
        {
            showOnlyChecked = value;
            ApplyFilter();
            OnPropertyChanged(nameof(ShowOnlyChecked));
        }
    }

    public FilterViewModel()
    {
        // 初始化数据
        Items = new ObservableCollection<ItemModel>
        {
            new ItemModel { Name = "Item 1", IsChecked = true },
            new ItemModel { Name = "Item 2", IsChecked = false },
            new ItemModel { Name = "Item 3", IsChecked = true },
            // ...
        };
    }

    private void ApplyFilter()
    {
        var filteredItems = Items.Where(item => item.Name.Contains(FilterText));

        if (ShowOnlyChecked)
        {
            filteredItems = filteredItems.Where(item => item.IsChecked);
        }

        Items = new ObservableCollection<ItemModel>(filteredItems);
    }

    public event PropertyChangedEventHandler PropertyChanged;
    protected virtual void OnPropertyChanged(string propertyName)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }
}

然后，在XAML中创建一个包含TextBox、CheckBox和DataGrid的视图，并绑定到FilterViewModel：

<Window x:Class="FilteringDataGridSample.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="Filtering DataGrid Sample" Height="450" Width="800">
    <Window.DataContext>
        <local:FilterViewModel />
    </Window.DataContext>
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto" />
            <RowDefinition Height="Auto" />
            <RowDefinition Height="*" />
        </Grid.RowDefinitions>

        <TextBox Grid.Row="0" Text="{Binding FilterText, UpdateSourceTrigger=PropertyChanged}" />

        <CheckBox Grid.Row="1" Content="Show only checked" IsChecked="{Binding ShowOnlyChecked}" />

        <DataGrid Grid.Row="2" ItemsSource="{Binding Items}" AutoGenerateColumns="False">
            <DataGrid.Columns>
                <DataGridTextColumn Header="Name" Binding="{Binding Name}" />
                <DataGridCheckBoxColumn Header="Is Checked" Binding="{Binding IsChecked}" />
            </DataGrid.Columns>
        </DataGrid>
    </Grid>
</Window>

最后，将MainWindow设置为应用程序的起始点：

public partial class App : Application
{
    protected override void OnStartup(StartupEventArgs e)
    {
        base.OnStartup(e);

        MainWindow mainWindow = new MainWindow();
        mainWindow.Show();
    }
}

这样，当用户在TextBox中输入过滤条件或勾选CheckBox时，DataGrid将根据FilterViewModel中的逻辑自动更新显示的行。