WPF实现带筛选功能的DataGrid
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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。
到此这篇关于WPF实现带筛选功能的DataGrid的文章就介绍到这了,更多相关WPF DataGrid内容请搜索编程网以前的文章或继续浏览下面的相关文章希望大家以后多多支持编程网！
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