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：
- 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。
- 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。
- 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。
- 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。
示例截图
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。
<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
{
#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 = $"张{i}牛",
Age = (i % 10) + 10,
No = i.ToString().PadLeft(4, '0'),
});
}
this.Nos= new List<FilterInfo>();
this.Names= new List<FilterInfo>();
this.Ages= new List<FilterInfo>();
this.Students.ForEach(s => {
this.Nos.Add(new FilterInfo() { FilterText=s.No,IsChecked=false });
this.Names.Add(new FilterInfo() { FilterText = s.Name, IsChecked = false });
this.Ages.Add(new FilterInfo() { FilterText = s.Age.ToString(), IsChecked = false });
});
this.Ages=this.Ages.Distinct().ToList();//去重
}
#endregion
}
}筛选功能实现【MainWindow.xaml.cs】
本示例为了简化实现，筛选功能处理主要在cs后端实现，如下所示：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
namespace DemoDataGrid
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
private MainWindowViewModel viewModel;
public MainWindow()
{
InitializeComponent();
viewModel = new MainWindowViewModel();
this.DataContext = viewModel;
}
#region 筛选
private void TextBlock_MouseRightButtonDown(object sender, MouseButtonEventArgs e)
{
if (sender != null && sender is TextBlock)
{
var textBlock = sender as TextBlock;
var tag = textBlock.Tag.ToString();
var pop = this.FindName($"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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