WPF 【十月的寒流】学习笔记(1):DataGrid过滤

相关链接

十月的寒流

在 WPF 中制作 DataGrid 的数据筛选功能

WPF 中如何制作 DataGrid 的分页功能

代码仓库

我为了方便展示源代码，我将代码提交到了代码仓库里面

B站【十月的寒流】对应课程的代码 Github仓库

前言

为了深入的重新学习WPF的基础知识，打算从【B站：十月的寒流】这位大佬上面去学习WPF的相关的知识。我其实更推荐大家去看原视频的相关教程内容。

环境

• visual studio 2022
• .net core 8.0
• windows11

DataGrid 数据筛选

项目配置

如何使用我这里就不展开说明了

WPF CommunityToolkit.Mvvm

WPF CommunityToolkit.Mvvm Messenger通讯

WPF-UI HandyControl 简单介绍

WPF-UI HandyControl 控件简单实战+IconPacks矢量图导入

Bogus，.NET生成批量模拟数据

使用原理

WPF DataGrid 数据过滤

ICollectionView让MVVM更简单

微软官方文档|ICollectionView 接口

这里不得不提到微软的WPF文档了，写了和没写差不多。

实现原理就是微软为了方便对数据进行分组、排序和筛选。给ItemSorce添加了ICollectionView 专门用于干这个。然后我们可以对ICollectionView添加规则，Ture就是需要，False就是不需要。

主要代码（详细代码可以看我的GitHub仓库）

Models.Person

    public class Person{public int Id { get; set; }public string FullName { get; set; }public string FirstName { get; set; }public string LastName { get; set; }public DateTime BirthDay { get; set; }}

DataGirdView

<UserControl x:Class="DataGrid_Filter.Views.DataGirdView"xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"xmlns:d="http://schemas.microsoft.com/expression/blend/2008"xmlns:local="clr-namespace:DataGrid_Filter.Views"xmlns:hc="https://handyorg.github.io/handycontrol"xmlns:viewModels="clr-namespace:DataGrid_Filter.ViewModels"mc:Ignorable="d"d:DesignHeight="450"d:DesignWidth="800"><UserControl.DataContext><viewModels:DataGridViewModel  x:Name="ViewModel" /></UserControl.DataContext><DockPanel LastChildFill="True"><StackPanel DockPanel.Dock="Bottom"Orientation="Horizontal"Margin="5"><Button Command="{Binding AddItemCommand}"Content="AddNewItem" /><!--添加名称，方便绑定--><hc:TextBox Text="{Binding FilterStr,UpdateSourceTrigger=PropertyChanged}"hc:InfoElement.Placeholder="Filter By Name"MinWidth="200"Margin="5 0 0 0"x:Name="FilterBox" /></StackPanel><!--添加名称，方便绑定--><DataGrid ItemsSource="{Binding PeopleList}"x:Name="PeopleDataGrid"></DataGrid></DockPanel>
</UserControl>

    public partial class DataGirdView : UserControl{public DataGirdView(){InitializeComponent();//将主要的代码逻辑放在ViewModel里面ViewModel.DataGirdView = this;}}

DataGridViewModel

 public partial class DataGridViewModel : ObservableObject{[ObservableProperty]private string title = "DataGird Tttle";[ObservableProperty]private ObservableCollection<Models.Person> peopleList = new();[ObservableProperty]private ICollectionView collectionView;[ObservableProperty]private string filterStr = "";private DataGrid_Filter.Views.DataGirdView dataGirdView;public DataGrid_Filter.Views.DataGirdView DataGirdView{get => dataGirdView;set {dataGirdView = value;ViewInit();}}public static int OrderId = 1;/// <summary>/// 生成模拟的数据/// </summary>public static Faker<Models.Person> Faker = new Faker<Models.Person>().RuleFor(t => t.Id, f => OrderId++).RuleFor(t => t.FirstName, f => f.Name.FirstName()).RuleFor(t => t.LastName, f => f.Name.LastName()).RuleFor(t => t.FullName, f => f.Name.FullName()).RuleFor(t => t.BirthDay, f => f.Date.Between(new DateTime(1990, 1, 1), new DateTime(2010, 1, 1)));public DataGridViewModel(){PeopleList = new ObservableCollection<Models.Person>(Faker.Generate(10));}[RelayCommand]public void AddItem(){var item = Faker.Generate();PeopleList.Add(item);}public void ViewInit(){//获取ItemSource的CollectionViewCollectionView = CollectionViewSource.GetDefaultView(DataGirdView.PeopleDataGrid.ItemsSource);//给CollectionView添加过滤规则CollectionView.Filter = (item) =>{if (string.IsNullOrEmpty(FilterStr)){return true;}else{var model = item as Models.Person;return model.FirstName.Contains(FilterStr) || model.LastName.Contains(FilterStr) || model.FullName.Contains(FilterStr);}};//在TextChanged的时候，实时更新DataGirdView.FilterBox.TextChanged += (s, e) =>{CollectionView.Refresh();};}}

实现效果

DataGrid直接绑定CollectionView

第一种方法是通过获取ItemSorce来获取CollectionView，实在是舍近求远。这次我们选择第二种方法。直接绑定设置好的CollectionView。然后我们在每次刷新输入框和改动数据的时候，主动更新绑定内容。

xaml

<UserControl x:Class="DataGrid_Filter.Views.DataGrid2View"xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:local="clr-namespace:DataGrid_Filter.Views"xmlns:viewModels="clr-namespace:DataGrid_Filter.ViewModels"xmlns:hc="https://handyorg.github.io/handycontrol"mc:Ignorable="d" d:DesignHeight="450" d:DesignWidth="800"><UserControl.DataContext><viewModels:DataGrid2ViewModel /></UserControl.DataContext><Grid><DockPanel LastChildFill="True"><StackPanel DockPanel.Dock="Bottom"Orientation="Horizontal"Margin="5"><Button Command="{Binding AddItemCommand}"Content="AddNewItem" /><!--添加名称，方便绑定--><hc:TextBox Text="{Binding FilterStr,UpdateSourceTrigger=PropertyChanged}"hc:InfoElement.Placeholder="Filter By Name"MinWidth="200"Margin="5 0 0 0"x:Name="FilterBox" /></StackPanel><!--添加名称，方便绑定--><DataGrid ItemsSource="{Binding CollectionView}"x:Name="PeopleDataGrid"></DataGrid></DockPanel></Grid>
</UserControl>

ViewModel

using Bogus;
using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;
using DataGrid_Filter.Views;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Data;namespace DataGrid_Filter.ViewModels
{public partial class DataGrid2ViewModel : ObservableObject{[ObservableProperty]private List<Models.Person> people = new List<Models.Person>();[ObservableProperty]private ICollectionView collectionView;private string filterStr = "";public string FilterStr{get{return filterStr;}set{SetProperty(ref filterStr, value);CollectionView.Refresh();}}[RelayCommand]public void AddItem(){var item = DataGridViewModel.Faker.Generate();People.Add(item);CollectionView.Refresh();}public DataGrid2ViewModel(){People = DataGridViewModel.Faker.Generate(10).ToList();CollectionView = CollectionViewSource.GetDefaultView(People);CollectionView.Filter = (item) =>{if (string.IsNullOrEmpty(FilterStr)){return true;}else{var model = item as Models.Person;return model.FirstName.Contains(FilterStr) || model.LastName.Contains(FilterStr) || model.FullName.Contains(FilterStr);}};}}
}

总结

学WPF还是不能闭门造车，一定要先找网上有没有对应的方法，实在没有再自己想方法解决。【十月的寒流】的【WPF教程】确实不错，建议大家都去看一下。