WPF数据绑定，属性值更改UI不刷新其内容[重复]
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【中文标题】WPF数据绑定，属性值更改UI不刷新其内容[重复]【英文标题】：WPF data binding, on properties values changed the UI don't refresh its content [duplicate] 【发布时间】：2021-12-13 05:30:45 【问题描述】：我知道有很多问题可能看起来像这样，但我在这里和其他论坛上真的找不到任何人回答我的问题。
所以，我对 WPF 比较陌生，我正在测试数据绑定，但我遇到了一个问题，即当 ObservableCollection 的值发生更改时，数据没有得到更新。
我会举个例子。
Main.xaml
<Window x:Class="TestWPF.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:TestWPF"
mc:Ignorable="d"
Title="MainWindow" Height="450" Width="800">
<Grid x:Name="MyGrid">
</Grid>
</Window>
Main.xaml.cs
using System.Windows;
namespace TestWPF
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
public MainWindow()
InitializeComponent();
Stand stand = new Stand("Best Seller Stand");
stand.cars.Add(new Car()
ID = "1",
Brand = "BMW",
CarNumber = 165,
HaveRadio = true
);
stand.cars.Add(new Car()
ID = "2",
Brand = "Toyota",
CarNumber = 421,
HaveRadio = true
);
stand.cars.Add(new Car()
ID = "4",
Brand = "FIAT",
CarNumber = 312,
HaveRadio = false
);
stand.cars.Add(new Car()
ID = "3",
Brand = "Ferrari",
CarNumber = 12,
HaveRadio = true
);
MyGrid.Children.Add(stand.GetCatalog());
汽车.cs
using System;
namespace TestWPF
public class Car : IComparable, IComparable<int>
public string ID get; set;
public string Brand get; set;
public int CarNumber get; set;
public bool HaveRadio get; set;
public void GerateRandomCarNumber()
CarNumber = new Random().Next(int.MinValue, int.MaxValue);
public int CompareTo(int other)
return CarNumber.CompareTo(other);
public int CompareTo(object obj)
Car other = null;
if (obj is Car)
other = obj as Car;
return CarNumber.CompareTo(other.CarNumber);
Stand.cs
using System.Collections.Generic;
using System.Linq;
namespace TestWPF
public class Stand
public Stand(string name)
Name = name;
public string Name get; set;
public SortedSet<Car> cars get; set; = new SortedSet<Car>();
public Car BestChoice
get
return cars.First();
public StandCatalog Catalog get; set; = null;
public StandCatalog GetCatalog()
if (Catalog == null)
Catalog = new StandCatalog(this);
return Catalog;
StandCatalog.xaml（用户控件）
<UserControl x:Class="TestWPF.StandCatalog"
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:TestWPF"
mc:Ignorable="d"
d:DesignHeight="450" d:DesignWidth="800">
<StackPanel Orientation="Vertical">
<Label Name="StandName" Content="Binding Model.Name" Margin="10"/>
<Label Name="CarBrand" Content="Binding Model.BestChoice.Brand" Margin="10"/>
<DataGrid AutoGenerateColumns="False" ItemsSource="Binding CatalogCar">
<DataGrid.Columns>
<DataGridTextColumn Header="ID" Binding="Binding ID"/>
<DataGridTextColumn Header="Brand" Binding="Binding Brand"/>
<DataGridTextColumn Header="Car Number" Binding="Binding CarNumber"/>
<DataGridCheckBoxColumn Header="Have Radio" Binding="Binding HaveRadio"/>
</DataGrid.Columns>
</DataGrid>
<Button Content="Gerate Random Number" Click="btn_GerateRandomNumber"/>
</StackPanel>
</UserControl>
StandCatalog.xaml.cs
using System.Collections.ObjectModel;
using System.Windows;
using System.Windows.Controls;
namespace TestWPF
/// <summary>
/// Interaction logic for StandCatalog.xaml
/// </summary>
public partial class StandCatalog : UserControl
public Stand Model get; init;
public ObservableCollection<Car> CatalogCar get; set;
public StandCatalog()
InitializeComponent();
this.DataContext = this;
public StandCatalog(Stand model) : this()
Model = model;
CatalogCar = new ObservableCollection<Car>(Model.cars);
private void btn_GerateRandomNumber(object sender, RoutedEventArgs e)
foreach (var item in Model.cars)
item.GerateRandomCarNumber();
所以我得到了这个应用程序：
但是当我点击按钮生成随机数时，数据网格不会刷新，标签 (Name="CarBrand") 也不会改变...... 当元素更改其值时，数据绑定不会刷新 UI 吗？
我知道值发生了变化，因为当我重新排序数据网格时，我得到了这个：
谁能帮帮我？
另一个问题，我将 Stand 类用作 StandCatalog（视图/控制器）的模型，同时使用 SortedSet 和 ObservableCollection 的最佳方法是什么？还是应该在模型中使用 SortedSet？
【问题讨论】：
您尚未为您的属性实现 INotifyPropertyChanged。当属性更改时，UI 不会收到通知，因为没有反馈。实现 INotifyPropertyChanged 并在所有属性设置器中调用 PropertyChanged，它应该可以工作。 【参考方案1】：选项 1：INotifyPropertyChanged
Car 类应实现INotifyPropertyChanged 接口，以便在属性更改时通知目标。
public class Car : IComparable, IComparable<int>, INotifyPropertyChanged
private int _carNumber;
public string ID get; set;
public string Brand get; set;
public int CarNumber
get => _carNumber;
set
if (_carNumber == value) return;
_carNumber = value;
OnPropertyChanged();
public bool HaveRadio get; set;
public void GerateRandomCarNumber() CarNumber = new Random().Next(int.MinValue, int.MaxValue);
public int CompareTo(int other) return CarNumber.CompareTo(other);
public int CompareTo(object obj)
Car other = null;
if (obj is Car)
other = obj as Car;
return CarNumber.CompareTo(other.CarNumber);
public event PropertyChangedEventHandler PropertyChanged;
protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null) PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
选项 2：DependencyProperty
将CarNumber 属性定义为DependencyProperty。基础架构将处理这些更改。
public class Car : DependencyObject, IComparable, IComparable<int>
public static readonly DependencyProperty
CarNumberProperty = DependencyProperty.Register("CarNumber", typeof(int), typeof(Car));
public string ID get; set;
public string Brand get; set;
public int CarNumber
get => (int)GetValue(CarNumberProperty);
set => SetValue(CarNumberProperty, value);
public bool HaveRadio get; set;
public void GerateRandomCarNumber() CarNumber = new Random().Next(int.MinValue, int.MaxValue);
public int CompareTo(int other) return CarNumber.CompareTo(other);
public int CompareTo(object obj)
Car other = null;
if (obj is Car)
other = obj as Car;
return CarNumber.CompareTo(other.CarNumber);
【讨论】：
See here 为什么在视图模型中通常不使用选项 2。以上是关于WPF数据绑定，属性值更改UI不刷新其内容[重复]的主要内容，如果未能解决你的问题，请参考以下文章