• WPF中的DataGrid如何实现刷选功能
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在默认情况下,WPF提供的DataGrid仅拥有数据展示等简单功能,如果要实现像Excel一样复杂的筛选功能,则相对比较麻烦。本文以一个简单的小例子,简述如何通过WPF实话DataGrid的筛选功能,仅供学习分享使用,如有不足之处,还请指正。

涉及知识点
在本示例中,从数据绑定,到数据展示,涉及知识点如下所示:
1.DataGrid,要WPF提供的进行二维数据展示在列表控件,默认功能非常简单,但是可以通过数据模板或者控件模板进行扩展和美化,可伸缩性很强。
2.MVVM,是Model-View-ViewModel的简写,主要进行数据和UI进行前后端分离,在本示例中,主要用到的MVVM第三方库为CommunityToolkit.Mvvm,大大简化原生MVVM的实现方式。
3.集合视图, 要对 DataGrid 中的数据进行分组、排序和筛选,可以将其绑定到支持这些函数的 CollectionView。然后,可以在不影响基础源数据的情况下处理 CollectionView 中的数据。集合视图中的更改反映在 DataGrid 用户界面 (UI) 中。
4.Popup控件,直接继承FrameworkElement,提供了一种在单独的窗口中显示内容的方法,该窗口相对于指定的元素或屏幕坐标,浮动在当前Popup应用程序窗口上,可用于悬浮窗口。

本示例主要模仿Excel的筛选功能进行实现,右键标题栏打开浮动窗口,悬浮于标题栏下方,既可以通过文本框进行筛选,也可以通过筛选按钮弹出右键菜单,选择具体筛选方式,截图如下所示:

选择筛选方式,弹出窗口,如下所示:

 输入筛选条件,点击确定,或者取消筛选。如筛选学号里面包含2的,效果如下所示:

 注意:以上筛选都是客户端筛选,不会修改数据源,也不会重连数据库。

核心源码
在本示例中,核心源码主要包含以下几个部分:
前端视图【MainWindow.xaml】源码
主要实现了按学号,姓名,年龄三列进行筛选,既可以单列筛选,又可以组合筛选。且三列的筛选实现方式一致,仅是绑定列有差异。
<!--堆代码 duidaima.com-->
<Window x:Class="DemoDataGrid.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:DemoDataGrid"
        mc:Ignorable="d"
        Title="DataGrid筛选示例" Height="650" Width="800">
    <Window.Resources>
        <ResourceDictionary>
            <CollectionViewSource x:Key="ItemsSource" Source="{Binding Path=Students}"></CollectionViewSource>
            <CollectionViewSource x:Key="Names" Source="{Binding Path=Names}"></CollectionViewSource>
            <CollectionViewSource x:Key="Nos" Source="{Binding Path=Nos}"></CollectionViewSource>
            <CollectionViewSource x:Key="Ages" Source="{Binding Path=Ages}"></CollectionViewSource>
            <Style x:Key="ListBoxStyle" TargetType="{x:Type ListBox}">
                <Setter Property="ScrollViewer.CanContentScroll" Value="True"></Setter>
                <Setter Property="Template">
                    <Setter.Value>
                        <ControlTemplate TargetType="{x:Type ListBox}">
                            <ScrollViewer x:Name="ScrollViewer" CanContentScroll="True">
                                <ItemsPresenter></ItemsPresenter>
                            </ScrollViewer>
                        </ControlTemplate>
                    </Setter.Value>
                </Setter>
</Style>
            <Geometry x:Key="Icon_Filter">
                M608 864C588.8 864 576 851.2 576 832L576 448c0-6.4 6.4-19.2 12.8-25.6L787.2 256c6.4-6.4 6.4-19.2 0-19.2 0-6.4-6.4-12.8-19.2-12.8L256 224c-12.8 0-19.2 6.4-19.2 12.8 0 6.4-6.4 12.8 6.4 19.2l198.4 166.4C441.6 428.8 448 441.6 448 448l0 256c0 19.2-12.8 32-32 32S384 723.2 384 704L384 460.8 198.4 307.2c-25.6-25.6-32-64-19.2-96C185.6 179.2 217.6 160 256 160L768 160c32 0 64 19.2 76.8 51.2 12.8 32 6.4 70.4-19.2 89.6l-192 160L633.6 832C640 851.2 627.2 864 608 864z
            </Geometry>
            <ContextMenu x:Key="queryConditionMenu" MouseLeave="ContextMenu_MouseLeave" MenuItem.Click="ContextMenu_Click">
                <MenuItem FontSize="12" Header="等于" Tag="Equal"></MenuItem>
                <MenuItem FontSize="12" Header="不等于"  Tag="NotEqual"></MenuItem>
                <MenuItem FontSize="12" Header="开头"  Tag="Begin"></MenuItem>
                <MenuItem FontSize="12" Header="结尾"  Tag="End"></MenuItem>
                <MenuItem FontSize="12" Header="包含"  Tag="In"></MenuItem>
                <MenuItem FontSize="12" Header="不包含"  Tag="NotIn"></MenuItem>
            </ContextMenu>
        </ResourceDictionary>

    </Window.Resources>
    <Grid Margin="10">
        <Grid.RowDefinitions>
            <RowDefinition Height="20"></RowDefinition>
            <RowDefinition Height="*"></RowDefinition>
        </Grid.RowDefinitions>
        <DataGrid Grid.Row="1" x:Name="dgStudents" ItemsSource="{Binding Source={StaticResource ItemsSource} }" AutoGenerateColumns="False"
                              CanUserReorderColumns="True" CanUserDeleteRows="False" CanUserAddRows="False" HeadersVisibility="Column"
                              CanUserSortColumns="True"
                              VirtualizingPanel.VirtualizationMode="Recycling"
                              EnableColumnVirtualization="True" VirtualizingPanel.IsVirtualizingWhenGrouping="True" GridLinesVisibility="All" RowHeight="25"
                              SelectionUnit="FullRow" SelectionMode="Single" IsReadOnly="True" FontSize="12"
                              SelectedIndex="{Binding SelectTaskItemIndex}" SelectedItem="{Binding SelectTaskItem}"
                              CanUserResizeColumns="True">
            <DataGrid.Columns>
                <DataGridTextColumn Binding="{Binding Id}" Header="Id" Width="*">

                </DataGridTextColumn>
                <DataGridTextColumn Binding="{Binding No}" Width="*">
                    <DataGridTextColumn.Header>
                        <TextBlock Text="学号" FontWeight="Regular" MouseRightButtonDown="TextBlock_MouseRightButtonDown" Tag="No"></TextBlock>
                    </DataGridTextColumn.Header>
                </DataGridTextColumn>
                <DataGridTextColumn Binding="{Binding Name}" Width="*">
                    <DataGridTextColumn.Header>
                        <TextBlock Text="姓名" FontWeight="Regular" MouseRightButtonDown="TextBlock_MouseRightButtonDown" Tag="Name"></TextBlock>
                    </DataGridTextColumn.Header>
                </DataGridTextColumn>
                <DataGridTextColumn Binding="{Binding Age}" Width="*">
                    <DataGridTextColumn.Header>
                        <TextBlock Text="年龄" FontWeight="Regular" MouseRightButtonDown="TextBlock_MouseRightButtonDown" Tag="Age"></TextBlock>
                    </DataGridTextColumn.Header>
                </DataGridTextColumn>
            </DataGrid.Columns>
        </DataGrid>
        <Popup x:Name="popupNo" Width="135" MaxHeight="500" Height="Auto" PopupAnimation="Slide" AllowsTransparency="False" MouseLeave="popup_MouseLeave">
            <Border BorderBrush="LightBlue" BorderThickness="1" Padding="5" Background="AliceBlue">
                <Grid>
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition></ColumnDefinition>
                        <ColumnDefinition></ColumnDefinition>
                    </Grid.ColumnDefinitions>
                    <Grid.RowDefinitions>
                        <RowDefinition></RowDefinition>
                        <RowDefinition></RowDefinition>
                        <RowDefinition></RowDefinition>
                    </Grid.RowDefinitions>
                    <StackPanel Grid.Column="0" Grid.Row="0" Grid.ColumnSpan="2" Orientation="Horizontal">
                        <TextBox Height="25" x:Name="txtNo" MinWidth="60" Grid.Column="0" Grid.Row="0" Grid.ColumnSpan="2" Tag="No" TextChanged="TextBox_TextChanged"></TextBox>
                        <Button x:Name="btnNoFilter"  Tag="No" ClickMode="Press" Click="ButtonFilter_Click" ContextMenu="{StaticResource queryConditionMenu}">
                            <StackPanel Orientation="Horizontal" VerticalAlignment="Center">
                                <Path Data="{StaticResource Icon_Filter}" Stroke="Gray" StrokeThickness="1"
                       Height="12" Width="12" Stretch="Fill"></Path>
                                <TextBlock Margin="2,0" Text="筛选" FontSize="12"></TextBlock>
                            </StackPanel>
                        </Button>
                    </StackPanel>
                    <ListBox x:Name="lbNos" ItemsSource="{Binding Source={StaticResource Nos}}" Grid.Column="0" Grid.Row="1" Grid.ColumnSpan="2" VirtualizingPanel.VirtualizationMode="Recycling" VirtualizingPanel.IsVirtualizing="True" Style="{StaticResource ListBoxStyle}">
                        <ListBox.ItemTemplate>
                            <DataTemplate>
                                <CheckBox Content="{Binding FilterText}" IsChecked="{Binding IsChecked}"></CheckBox>
                            </DataTemplate>
                        </ListBox.ItemTemplate>
                    </ListBox>

                    <Button Tag="No" Content="取消" Width="60" HorizontalAlignment="Left" Grid.Row="2" Grid.Column="0" Click="btnCancel_Click"></Button>
                    <Button Content="确定" Width="60" HorizontalAlignment="Right" Grid.Row="2" Grid.Column="1" Click="btnOk_Click"></Button>
                </Grid>
            </Border>
        </Popup>
        <Popup x:Name="popupName" Width="135" MaxHeight="500" Height="Auto" PopupAnimation="Slide" AllowsTransparency="False" MouseLeave="popup_MouseLeave">
            <Border BorderBrush="LightBlue" BorderThickness="1" Padding="5" Background="AliceBlue">
                <Grid>
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition></ColumnDefinition>
                        <ColumnDefinition></ColumnDefinition>
                    </Grid.ColumnDefinitions>
                    <Grid.RowDefinitions>
                        <RowDefinition></RowDefinition>
                        <RowDefinition></RowDefinition>
                        <RowDefinition></RowDefinition>
                    </Grid.RowDefinitions>
                    <StackPanel Grid.Column="0" Grid.Row="0" Grid.ColumnSpan="2" Orientation="Horizontal">
                        <TextBox Height="25" x:Name="txtName" MinWidth="60" Grid.Column="0" Grid.Row="0" Grid.ColumnSpan="2" Tag="Name" TextChanged="TextBox_TextChanged"></TextBox>
                        <Button x:Name="btnNameFilter"  Tag="Name" Click="ButtonFilter_Click" ContextMenu="{StaticResource queryConditionMenu}">
                            <StackPanel Orientation="Horizontal" VerticalAlignment="Center">
                                <Path Data="{StaticResource Icon_Filter}" Stroke="Gray" StrokeThickness="1"
                       Height="12" Width="12" Stretch="Fill"></Path>
                                <TextBlock Margin="2,0" Text="筛选" FontSize="12"></TextBlock>
                            </StackPanel>
                        </Button>
                    </StackPanel>
                    <ListBox x:Name="lbNames" ItemsSource="{Binding Source={StaticResource Names}}" Grid.Column="0" Grid.Row="1" Grid.ColumnSpan="2" VirtualizingPanel.VirtualizationMode="Recycling" VirtualizingPanel.IsVirtualizing="True" Style="{StaticResource ListBoxStyle}">
                        <ListBox.ItemTemplate>
                            <DataTemplate>
                                <CheckBox Content="{Binding FilterText}" IsChecked="{Binding IsChecked}"></CheckBox>
                            </DataTemplate>
                        </ListBox.ItemTemplate>
                    </ListBox>

                    <Button Tag="No" Content="取消" Width="60" HorizontalAlignment="Left" Grid.Row="2" Grid.Column="0" Click="btnCancel_Click"></Button>
                    <Button Content="确定" Width="60" HorizontalAlignment="Right" Grid.Row="2" Grid.Column="1" Click="btnOk_Click"></Button>
                </Grid>
            </Border>
        </Popup>
        <Popup x:Name="popupAge" Width="135" MaxHeight="500" Height="Auto" PopupAnimation="Slide" AllowsTransparency="False" MouseLeave="popup_MouseLeave">
            <Border BorderBrush="LightBlue" BorderThickness="1" Padding="5" Background="AliceBlue">
                <Grid>
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition></ColumnDefinition>
                        <ColumnDefinition></ColumnDefinition>
                    </Grid.ColumnDefinitions>
                    <Grid.RowDefinitions>
                        <RowDefinition></RowDefinition>
                        <RowDefinition></RowDefinition>
                        <RowDefinition></RowDefinition>
                    </Grid.RowDefinitions>
                    <StackPanel Grid.Column="0" Grid.Row="0" Grid.ColumnSpan="2" Orientation="Horizontal">
                        <TextBox Height="25" x:Name="txtAge" MinWidth="60" Grid.Column="0" Grid.Row="0" Grid.ColumnSpan="2" Tag="Age" TextChanged="TextBox_TextChanged"></TextBox>
                        <Button x:Name="btnAgeFilter"  Tag="Age" Click="ButtonFilter_Click" ContextMenu="{StaticResource queryConditionMenu}">
                            <StackPanel Orientation="Horizontal" VerticalAlignment="Center">
                                <Path Data="{StaticResource Icon_Filter}" Stroke="Gray" StrokeThickness="1"
                       Height="12" Width="12" Stretch="Fill"></Path>
                                <TextBlock Margin="2,0" Text="筛选" FontSize="12"></TextBlock>
                            </StackPanel>
                        </Button>
                    </StackPanel>
                    <ListBox x:Name="lbAges" ItemsSource="{Binding Source={StaticResource Ages}}" Grid.Column="0" Grid.Row="1" Grid.ColumnSpan="2" VirtualizingPanel.VirtualizationMode="Recycling" VirtualizingPanel.IsVirtualizing="True" Style="{StaticResource ListBoxStyle}">
                        <ListBox.ItemTemplate>
                            <DataTemplate>
                                <CheckBox Content="{Binding FilterText}" IsChecked="{Binding IsChecked}"></CheckBox>
                            </DataTemplate>
                        </ListBox.ItemTemplate>
                    </ListBox>

                    <Button Tag="No" Content="取消" Width="60" HorizontalAlignment="Left" Grid.Row="2" Grid.Column="0" Click="btnCancel_Click"></Button>
                    <Button Content="确定" Width="60" HorizontalAlignment="Right" Grid.Row="2" Grid.Column="1" Click="btnOk_Click"></Button>
                </Grid>
            </Border>
        </Popup>

        <Popup x:Name="popupNoMenu" Width="300" MaxHeight="500" Height="200" PopupAnimation="Slide" AllowsTransparency="False" Tag="">
            <Border BorderThickness="1" BorderBrush="Beige" Padding="15" Background="AliceBlue">
                <Grid>
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition></ColumnDefinition>
                        <ColumnDefinition></ColumnDefinition>
                    </Grid.ColumnDefinitions>
                    <Grid.RowDefinitions>
                        <RowDefinition Height="Auto"></RowDefinition>
                        <RowDefinition Height="Auto"></RowDefinition>
                        <RowDefinition Height="Auto"></RowDefinition>
                        <RowDefinition></RowDefinition>
                    </Grid.RowDefinitions>
                    <StackPanel Orientation="Horizontal" Grid.Row="0" Grid.Column="0" Grid.ColumnSpan="2">
                        <TextBlock Text="学号" VerticalAlignment="Center"></TextBlock>
                        <ComboBox x:Name="combNoMenu1" Height="28" Width="100" Margin="4" VerticalContentAlignment="Center">
                            <ComboBoxItem Content="等于" ></ComboBoxItem>
                            <ComboBoxItem Content="不等于"></ComboBoxItem>
                            <ComboBoxItem Content="开头"></ComboBoxItem>
                            <ComboBoxItem Content="结尾"></ComboBoxItem>
                            <ComboBoxItem Content="包含"></ComboBoxItem>
                            <ComboBoxItem Content="不包含"></ComboBoxItem>
                        </ComboBox>
                        <TextBox x:Name="txtNoMenu1" Height="28" Width="100" VerticalContentAlignment="Center"></TextBox>
                    </StackPanel>
                    <StackPanel Orientation="Horizontal" Grid.Row="1" Grid.Column="0"  Grid.ColumnSpan="2">
                        <RadioButton x:Name="rbNoAnd" Content="与" IsChecked="True" Margin="4" Background="AliceBlue" VerticalAlignment="Center" VerticalContentAlignment="Center"></RadioButton>
                        <RadioButton x:Name="rbNoOr" Content="或" Background="AliceBlue" VerticalAlignment="Center" VerticalContentAlignment="Center"></RadioButton>
                    </StackPanel>
                    <StackPanel Orientation="Horizontal" Grid.Row="2" Grid.Column="0"  Grid.ColumnSpan="2">
                        <TextBlock Text="学号" VerticalAlignment="Center"></TextBlock>
                        <ComboBox x:Name="combNoMenu2" Height="28" Margin="4" Width="100" VerticalContentAlignment="Center">
                            <ComboBoxItem Content="等于" ></ComboBoxItem>
                            <ComboBoxItem Content="不等于"></ComboBoxItem>
                            <ComboBoxItem Content="开头"></ComboBoxItem>
                            <ComboBoxItem Content="结尾"></ComboBoxItem>
                            <ComboBoxItem Content="包含"></ComboBoxItem>
                            <ComboBoxItem Content="不包含"></ComboBoxItem>
                        </ComboBox>
                        <TextBox x:Name="txtNoMenu2" Height="28" Width="100" VerticalContentAlignment="Center"></TextBox>
                    </StackPanel>
                    <Button Tag="No" Content="取消" Width="100" Height="28" HorizontalAlignment="Left" Grid.Row="3" Grid.Column="0" Click="btnCancelFilter_Click"></Button>
                    <Button Tag="No" Content="确定" Width="100" Height="28" HorizontalAlignment="Right" Grid.Row="3" Grid.Column="1" Click="btnOkFilter_Click"></Button>
                </Grid>
            </Border>
        </Popup>
        <Popup x:Name="popupNameMenu" Width="300" MaxHeight="500" Height="200" PopupAnimation="Slide" AllowsTransparency="False" Tag="">
            <Border BorderThickness="1" BorderBrush="Beige" Padding="15" Background="AliceBlue">
                <Grid>
                    <Grid.RowDefinitions>
                        <RowDefinition Height="Auto"></RowDefinition>
                        <RowDefinition Height="Auto"></RowDefinition>
                        <RowDefinition Height="Auto"></RowDefinition>
                        <RowDefinition Height="Auto"></RowDefinition>
                    </Grid.RowDefinitions>
                    <StackPanel Orientation="Horizontal" Grid.Row="0" Grid.Column="0">
                        <TextBlock Text="姓名" VerticalAlignment="Center"></TextBlock>
                        <ComboBox x:Name="combNameMenu1" Height="28" Width="100" Margin="4" VerticalContentAlignment="Center">
                            <ComboBoxItem Content="等于" ></ComboBoxItem>
                            <ComboBoxItem Content="不等于"></ComboBoxItem>
                            <ComboBoxItem Content="开头"></ComboBoxItem>
                            <ComboBoxItem Content="结尾"></ComboBoxItem>
                            <ComboBoxItem Content="包含"></ComboBoxItem>
                            <ComboBoxItem Content="不包含"></ComboBoxItem>
                        </ComboBox>
                        <TextBox x:Name="txtNameMenu1" Height="28" Width="100" VerticalContentAlignment="Center"></TextBox>
                    </StackPanel>
                    <StackPanel Orientation="Horizontal" Grid.Row="1" Grid.Column="0">
                        <RadioButton x:Name="rbNameAnd" Content="与" IsChecked="True" Margin="4" Background="AliceBlue" VerticalAlignment="Center" VerticalContentAlignment="Center"></RadioButton>
                        <RadioButton x:Name="rbNameOr" Content="或" Background="AliceBlue" VerticalAlignment="Center" VerticalContentAlignment="Center"></RadioButton>
                    </StackPanel>
                    <StackPanel Orientation="Horizontal" Grid.Row="2" Grid.Column="0">
                        <TextBlock Text="姓名" VerticalAlignment="Center"></TextBlock>
                        <ComboBox x:Name="combNameMenu2" Height="28" Width="100" Margin="4" VerticalContentAlignment="Center">
                            <ComboBoxItem Content="等于" ></ComboBoxItem>
                            <ComboBoxItem Content="不等于"></ComboBoxItem>
                            <ComboBoxItem Content="开头"></ComboBoxItem>
                            <ComboBoxItem Content="结尾"></ComboBoxItem>
                            <ComboBoxItem Content="包含"></ComboBoxItem>
                            <ComboBoxItem Content="不包含"></ComboBoxItem>
                        </ComboBox>
                        <TextBox x:Name="txtNameMenu2" Height="28" Width="100" VerticalContentAlignment="Center"></TextBox>
                    </StackPanel>
                    <Button Tag="Name" Content="取消" Width="100" Height="28" HorizontalAlignment="Left" Grid.Row="3" Grid.Column="0" Click="btnCancelFilter_Click"></Button>
                    <Button Tag="Name" Content="确定" Width="100" Height="28" HorizontalAlignment="Right" Grid.Row="3" Grid.Column="1" Click="btnOkFilter_Click"></Button>
                </Grid>
            </Border>
        </Popup>
        <Popup x:Name="popupAgeMenu" Width="300" MaxHeight="500" Height="200" PopupAnimation="Slide" AllowsTransparency="False" Tag="">
            <Border BorderThickness="1" BorderBrush="Beige" Padding="15" Background="AliceBlue">
                <Grid>
                    <Grid.RowDefinitions>
                        <RowDefinition Height="Auto"></RowDefinition>
                        <RowDefinition Height="Auto"></RowDefinition>
                        <RowDefinition Height="Auto"></RowDefinition>
                        <RowDefinition Height="Auto"></RowDefinition>
                    </Grid.RowDefinitions>
                    <StackPanel Orientation="Horizontal" Grid.Row="0" Grid.Column="0">
                        <TextBlock Text="年龄" VerticalAlignment="Center"></TextBlock>
                        <ComboBox x:Name="combAgeMenu1" Height="28" Width="100" Margin="4" VerticalContentAlignment="Center">
                            <ComboBoxItem Content="等于" ></ComboBoxItem>
                            <ComboBoxItem Content="不等于"></ComboBoxItem>
                            <ComboBoxItem Content="开头"></ComboBoxItem>
                            <ComboBoxItem Content="结尾"></ComboBoxItem>
                            <ComboBoxItem Content="包含"></ComboBoxItem>
                            <ComboBoxItem Content="不包含"></ComboBoxItem>
                        </ComboBox>
                        <TextBox x:Name="txtAgeMenu1" Height="28" Width="100" VerticalContentAlignment="Center"></TextBox>
                    </StackPanel>
                    <StackPanel Orientation="Horizontal" Grid.Row="1" Grid.Column="0">
                        <RadioButton x:Name="rbAgeAnd" Content="与"  IsChecked="True" Margin="4" Background="AliceBlue" VerticalAlignment="Center" VerticalContentAlignment="Center"></RadioButton>
                        <RadioButton x:Name="rbAgeOr" Content="或" Background="AliceBlue" VerticalAlignment="Center" VerticalContentAlignment="Center"></RadioButton>
                    </StackPanel>
                    <StackPanel Orientation="Horizontal" Grid.Row="2" Grid.Column="0">
                        <TextBlock Text="年龄" VerticalAlignment="Center"></TextBlock>
                        <ComboBox x:Name="combAgeMenu2" Height="28" Width="100" Margin="4" VerticalContentAlignment="Center">
                            <ComboBoxItem Content="等于" ></ComboBoxItem>
                            <ComboBoxItem Content="不等于"></ComboBoxItem>
                            <ComboBoxItem Content="开头"></ComboBoxItem>
                            <ComboBoxItem Content="结尾"></ComboBoxItem>
                            <ComboBoxItem Content="包含"></ComboBoxItem>
                            <ComboBoxItem Content="不包含"></ComboBoxItem>
                        </ComboBox>
                        <TextBox x:Name="txtAgeMenu2" Height="28" Width="100" VerticalContentAlignment="Center"></TextBox>
                    </StackPanel>
                    <Button Tag="Age" Content="取消" Width="100" Height="28" HorizontalAlignment="Left" Grid.Row="3" Grid.Column="0" Click="btnCancelFilter_Click"></Button>
                    <Button Tag="Age" Content="确定" Width="100" Height="28" HorizontalAlignment="Right" Grid.Row="3" Grid.Column="1" Click="btnOkFilter_Click"></Button>
                </Grid>
            </Border>
        </Popup>
    </Grid>
</Window>
业务逻辑【MainWindowViewModel】
业务逻辑处理主要复责数据初始化等业务相关内容,和UI无关,如下所示:
using CommunityToolkit.Mvvm.ComponentModel;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace DemoDataGrid
{
    public class MainWindowViewModel:ObservableObject
    {
        #堆代码 duidaima.com
        #region 属性及构造函数
        private List<Student> students;

        public List<Student> Students
        {
            get { return students; }
            set { SetProperty(ref students, value); }
        }

        private List<FilterInfo> names;

        public List<FilterInfo> Names
        {
            get { return names; }
            set { SetProperty(ref names, value); }
        }

        private List<FilterInfo> nos;

        public List<FilterInfo> Nos
        {
            get { return nos; }
            set {SetProperty(ref nos , value); }
        }

        private List<FilterInfo> ages;

        public List<FilterInfo> Ages
        {
            get { return ages; }
            set {SetProperty(ref ages , value); }
        }



        public MainWindowViewModel()
        {
            this.Students= new List<Student>();
            for (int i = 0; i < 20; i++) {
                this.Students.Add(new Student()
                {
                    Id = i,
                    Name = $"张{i}牛",
                    Age = (i % 10) + 10,
                    No = i.ToString().PadLeft(4, '0'),
                });
            }
            this.Nos= new List<FilterInfo>();
            this.Names= new List<FilterInfo>();
            this.Ages= new List<FilterInfo>();
            this.Students.ForEach(s => {
                this.Nos.Add(new FilterInfo() { FilterText=s.No,IsChecked=false });
                this.Names.Add(new FilterInfo() { FilterText = s.Name, IsChecked = false });
                this.Ages.Add(new FilterInfo() { FilterText = s.Age.ToString(), IsChecked = false });
            });
            this.Ages=this.Ages.Distinct().ToList();//去重
        }

        #endregion


    }
}
筛选功能实现【MainWindow.xaml.cs】
本示例为了简化实现,筛选功能处理主要在cs后端实现,如下所示:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace DemoDataGrid
{
    /// <summary>
    /// 堆代码 duidaima.com
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        private MainWindowViewModel viewModel;

        public MainWindow()
        {
            InitializeComponent();
            viewModel = new MainWindowViewModel();
            this.DataContext = viewModel;
        }
        #region 筛选
        private void TextBlock_MouseRightButtonDown(object sender, MouseButtonEventArgs e)
        {
            if (sender != null && sender is TextBlock)
            {
                var textBlock = sender as TextBlock;
                var tag = textBlock.Tag.ToString();
                var pop = this.FindName($"popup{tag}");
                if (pop != null)
                {
                    var popup = pop as System.Windows.Controls.Primitives.Popup;
                    if (popup != null)
                    {
                        popup.IsOpen = true;
                        popup.PlacementTarget = textBlock;
                        popup.Placement = System.Windows.Controls.Primitives.PlacementMode.RelativePoint;
                        popup.VerticalOffset = 10;
                        popup.HorizontalOffset = 10;
                    }
                }
            }
        }

        private void TextBox_TextChanged(object sender, TextChangedEventArgs e)
        {
            TextBox textBox = e.OriginalSource as TextBox;
            var tag = textBox.Tag;//条件
            var text = textBox.Text;
            if (tag != null)
            {
                if (tag.ToString() == "No")
                {
                    Filter(this.lbNos.ItemsSource, this.txtNo.Text);
                }
                if (tag.ToString() == "Name")
                {
                    Filter(this.lbNames.ItemsSource, this.txtName.Text);
                }
                if (tag.ToString() == "Age")
                {
                    Filter(this.lbAges.ItemsSource, this.txtAge.Text);
                }
            }

        }

        private void Filter(object source, string filter)
        {
            var cv = CollectionViewSource.GetDefaultView(source);
            if (cv != null && cv.CanFilter)
            {
                cv.Filter = new Predicate<object>((obj) => {
                    bool flag = true;
                    var t = obj as FilterInfo;
                    if (t != null)
                    {
                        flag = t.FilterText.Contains(filter);
                    }
                    return flag;
                });
            }
        }

        private void popup_MouseLeave(object sender, MouseEventArgs e)
        {
            var popup = e.OriginalSource as System.Windows.Controls.Primitives.Popup;
            var showContext = (this.FindResource("queryConditionMenu") as ContextMenu)?.IsOpen;
            if (popup != null && showContext==false)
            {
                popup.IsOpen = false;
            }
        }

        private void btnCancel_Click(object sender, RoutedEventArgs e)
        {
            var btn = e.OriginalSource as Button;
            if (btn != null)
            {
                var tag = btn.Tag;
                if (tag.ToString() == "No")
                {
                    ClearFilter(this.txtNo, this.viewModel.Nos);
                }
                if (tag.ToString() == "Name")
                {
                    ClearFilter(this.txtName, this.viewModel.Names);

                }
                if (tag.ToString() == "Age")
                {
                    ClearFilter(this.txtAge, this.viewModel.Ages);
                }
                FilterTask();//清除以后,重新刷新
            }
        }

        private void ClearFilter(TextBox textBox, List<FilterInfo> collection)
        {
            textBox.Clear();
            foreach (var f in collection)
            {
                f.IsChecked = false;
            }
        }

        private void btnOk_Click(object sender, RoutedEventArgs e)
        {
            //
            FilterTask();
        }


        private void FilterTask()
        {
            var cv = CollectionViewSource.GetDefaultView(this.dgStudents.ItemsSource);
            if (cv != null && cv.CanFilter)
            {
                cv.Filter = new Predicate<object>((obj) =>
                {
                    bool flag = true;
                    var t = obj as Student;
                    if (t != null)
                    {
                        var nos = this.viewModel.Nos.Where(r => r.IsChecked == true).ToList();
                        var names = this.viewModel.Names.Where(r => r.IsChecked == true).ToList();
                        var ages = this.viewModel.Ages.Where(r => r.IsChecked == true).ToList();
                        if (nos.Count() > 0)
                        {
                            flag = flag && nos.Select(r => r.FilterText).Contains(t.No);
                        }
                        if (names.Count() > 0)
                        {
                            flag = flag && names.Select(r => r.FilterText).Contains(t.Name);
                        }
                        if (ages.Count() > 0)
                        {
                            flag = flag && ages.Select(r => r.FilterText).Contains(t.Age.ToString());
                        }
                    }
                    return flag;
                });
            }
        }

        #endregion

        private List<string> condition = new List<string>() { "Equal", "NotEqual", "Begin", "End", "In", "NotIn" };

        private void ButtonFilter_Click(object sender, RoutedEventArgs e)
        {
            var btn = e.OriginalSource as Button;
            if (btn != null)
            {
                var tag = btn.Tag;
                var popup = this.FindName($"popup{tag}") as System.Windows.Controls.Primitives.Popup;
                if (popup != null)
                {
                    popup.IsOpen = true;
                }
                if (btn.ContextMenu.IsOpen)
                {
                    btn.ContextMenu.IsOpen = false;
                }
                else
                {
                    btn.ContextMenu.Tag = tag;
                    btn.ContextMenu.Width = 100;
                    btn.ContextMenu.Height = 150;
                    btn.ContextMenu.IsOpen = true;
                    btn.ContextMenu.PlacementTarget = btn;
                    btn.ContextMenu.Placement = System.Windows.Controls.Primitives.PlacementMode.Bottom;
                }
            }
        }

        private void ContextMenu_MouseLeave(object sender, MouseEventArgs e)
        {
            var menu = e.OriginalSource as ContextMenu;
            if (menu != null)
            {
                menu.IsOpen = false;
            }
        }

        private void ContextMenu_Click(object sender, RoutedEventArgs e)
        {
            var contextMenu = sender as ContextMenu;
            if (contextMenu == null)
            {
                return;
            }
            var menuItem = e.OriginalSource as MenuItem;
            if (menuItem == null)
            {
                return;
            }
            var tag1 = contextMenu.Tag.ToString();//点击的哪一个按钮
            var tag2 = menuItem.Tag.ToString();//点击的是哪一个菜单
            var pop = this.FindName($"popup{tag1}Menu");
            var comb = this.FindName($"comb{tag1}Menu1");
            HideParentPopup(tag1);//隐藏父Popup
            if (comb != null)
            {
                var combMenu = comb as ComboBox;
                combMenu.SelectedIndex = condition.IndexOf(tag2);
            }
            if (pop != null)
            {
                var popup = pop as System.Windows.Controls.Primitives.Popup;
                popup.IsOpen = true;
                popup.PlacementTarget = dgStudents;
                popup.Placement = System.Windows.Controls.Primitives.PlacementMode.Center;
            }
        }

        private void btnCancelFilter_Click(object sender, RoutedEventArgs e)
        {
            if (sender == null)
            {
                return;
            }
            var btn = sender as System.Windows.Controls.Button;
            if (btn != null)
            {
                var tag = btn.Tag.ToString();
                HidePopupMenu(tag);//隐藏Popup控件
                if (tag == "No")
                {
                    ClearMenuFilter(this.txtNoMenu1, this.txtNoMenu2);
                }
                if (tag == "Name")
                {
                    ClearMenuFilter(this.txtNameMenu1, this.txtNameMenu2);
                }
                if (tag == "Age")
                {
                    ClearMenuFilter(this.txtAgeMenu1, this.txtAgeMenu2);
                }
                FilterMenuTask();
            }
        }


        private void btnOkFilter_Click(object sender, RoutedEventArgs e)
        {
            if (sender == null)
            {
                return;
            }
            var btn = sender as System.Windows.Controls.Button;
            if (btn != null)
            {
                var tag = btn.Tag.ToString();
                HidePopupMenu(tag);
                FilterMenuTask();
            }
        }

        /// <summary>
        /// 隐藏父Popup
        /// </summary>
        /// <param name="tag"></param>
        private void HideParentPopup(string tag)
        {
            //点击右键菜单时,隐藏父Popup控件
            if (tag == "No")
            {
                this.popupNo.IsOpen = false;
            }
            if (tag == "Name")
            {
                this.popupName.IsOpen = false;
            }
            if (tag == "Age")
            {
                this.popupAge.IsOpen = false;
            }
        }

        /// <summary>
        /// 隐藏菜单弹出的Popup控件
        /// </summary>
        /// <param name="tag"></param>
        private void HidePopupMenu(string tag)
        {
            var pop = this.FindName($"popup{tag}Menu");
            if (pop != null)
            {
                var popup = pop as System.Windows.Controls.Primitives.Popup;
                popup.IsOpen = false;
            }
        }

        /// <summary>
        /// 清除菜单中的文本过滤条件
        /// </summary>
        /// <param name="txt1"></param>
        /// <param name="txt2"></param>
        private void ClearMenuFilter(TextBox txt1, TextBox txt2)
        {
            txt1?.Clear();
            txt2?.Clear();
        }

        /// <summary>
        ///
        /// </summary>
        private void FilterMenuTask()
        {
            var cv = CollectionViewSource.GetDefaultView(this.dgStudents.ItemsSource);
            if (cv != null && cv.CanFilter)
            {
                cv.Filter = new Predicate<object>((obj) =>
                {
                    bool flag = true;
                    var t = obj as Student;
                    if (t != null)
                    {
                        string noText1 = this.txtNoMenu1.Text.Trim();
                        string noText2 = this.txtNoMenu2.Text.Trim();
                        int noConditionType1 = this.combNoMenu1.SelectedIndex;
                        int noConditionType2 = this.combNoMenu2.SelectedIndex;
                        string nameText1 = this.txtNameMenu1.Text.Trim();
                        string nameText2 = this.txtNameMenu2.Text.Trim();
                        int nameConditionType1 = this.combNameMenu1.SelectedIndex;
                        int nameConditionType2 = this.combNameMenu2.SelectedIndex;
                        string ageText1 = this.txtAgeMenu1.Text.Trim();
                        string ageText2 = this.txtAgeMenu2.Text.Trim();
                        int ageConditionType1 = this.combAgeMenu1.SelectedIndex;
                        int ageConditionType2 = this.combAgeMenu2.SelectedIndex;
                        bool? isNoAnd = this.rbNoAnd.IsChecked;
                        bool? isNoOr = this.rbNoOr.IsChecked;
                        bool? isNameAnd = this.rbNameAnd.IsChecked;
                        bool? isNameOr = this.rbNameOr.IsChecked;
                        bool? isAgeAnd = this.rbAgeAnd.IsChecked;
                        bool? isAgeOr = this.rbAgeOr.IsChecked;
                        bool flagNo = true;
                        bool flagName = true;
                        bool flagAge = true;
                        flagNo = CheckConditions(noConditionType1, noConditionType2, t.No, noText1, noText2, isNoAnd, isNoOr);
                        flagName = CheckConditions(nameConditionType1, nameConditionType2, t.Name, nameText1, nameText2, isNameAnd, isNameOr);
                        flagAge = CheckConditions(ageConditionType1, ageConditionType2, t.Age.ToString(), ageText1, ageText2, isAgeAnd, isAgeOr);
                        flag = flag && flagNo && flagName && flagAge;
                    }
                    return flag;
                });
            }
        }

        private bool CheckConditions(int conditionIndex1, int conditionIndex2, string source, string condition1, string condition2, bool? isAnd, bool? isOr)
        {
            bool flag = true;
            bool flag1 = true;
            bool flag2 = true;
            if (!string.IsNullOrEmpty(condition1) && !string.IsNullOrWhiteSpace(condition1) && conditionIndex1 != -1)
            {
                flag1 = CheckCondition(conditionIndex1, source, condition1);
            }
            if (!string.IsNullOrEmpty(condition2) && !string.IsNullOrWhiteSpace(condition2) && conditionIndex2 != -1)
            {
                flag2 = CheckCondition(conditionIndex2, source, condition2);
            }
            if (isAnd == true)
            {
                flag = flag1 && flag2;
            }
            if (isOr == true)
            {
                flag = flag1 || flag2;
            }
            return flag;
        }

        private bool CheckCondition(int condtionIndex, string source, string condition)
        {
            bool flag = true;
            if (condtionIndex == 0)
            {
                flag = flag && source == condition;
            }
            if (condtionIndex == 1)
            {
                flag = flag && source != condition;
            }
            if (condtionIndex == 2)
            {
                flag = flag && source.StartsWith(condition);
            }
            if (condtionIndex == 3)
            {
                flag = flag && source.EndsWith(condition);
            }
            if (condtionIndex == 4)
            {
                flag = flag && source.Contains(condition);
            }
            if (condtionIndex == 5)
            {
                flag = flag && !source.Contains(condition);
            }
            return flag;
        }
    }
}
学号,姓名,年龄三列过滤列表绑定内容模型一致,为FilterInfo,如下所示:
using CommunityToolkit.Mvvm.ComponentModel;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace DemoDataGrid
{
    public class FilterInfo : ObservableObject
    {
        private string filterText;

        public string FilterText
        {
            get { return filterText; }
            set { SetProperty(ref filterText, value); }
        }

        private bool isChecked;

        public bool IsChecked
        {
            get { return isChecked; }
            set { SetProperty(ref isChecked, value); }
        }
    }
}
不足与思考
上述筛选实现方式,并非唯一实现,也并非最优实现,同样存在许多可以优化的地方。在本示例中,存在许多冗余代码,如视图页面,对三列的弹出窗口,内容虽然相对统一,只是列名和绑定内容不同而已,却堆积了三大段代码,是否可以从控件模块或者数据模板的角度,进行简化呢?

筛选功能实现上,同样存在许多冗余代码,是否可以进行简化呢?以上是我们需要思考的地方,希望可以集思广益,共同学习,一起进步。
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