wpf 数据绑定 INotifyPropertyChanged封装

BindableBase.cs

public abstract class BindableBase : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;
    

    // 调用方法 : public string Name { get => name; set { SetProperty<string>(ref name, value); } }
    // 1. ref T storage：这是一个引用参数，表示要设置的属性的存储字段。ref关键字意味着如果在方法内部修改了storage，那么原始变量也会被修改。
    // 2. T value：这是要设置的新值。
    // 3. [CallerMemberName] string propertyName = null：这是属性的名称。
    //    [CallerMemberName]是一个特性，它会自动将调用该方法的属性的名称作为参数传入。
    //    如果在调用SetProperty<T>()时没有提供propertyName，那么编译器会自动插入调用该方法的属性的名称。
    protected virtual bool SetProperty<T>(ref T storage, T value, [CallerMemberName] string propertyName = null)
    {
        if (object.Equals(storage, value)) return false;

        storage = value;
        this.OnPropertyChanged(propertyName);

        return true;
    }
    
    protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
    {
        if (PropertyChanged != null)
        {
            PropertyChanged.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }
    }
}

src\Juster.Music\MainWindow.xaml

<Window 
        x:Class="Juster.Music.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:Juster.Music"
        mc:Ignorable="d"
        Title="MainWindow" Height="200" Width="200">

    <Window.Resources>
        <local:UserModel x:Key="MyDataSource"/>
    </Window.Resources>

    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition></RowDefinition>
            <RowDefinition></RowDefinition>
        </Grid.RowDefinitions>

        <StackPanel Grid.Row="0" HorizontalAlignment="Center">
            <Label>Enter a Name:</Label>
            <TextBox>
                <Binding Source="{StaticResource MyDataSource}" Path="Name"
                   UpdateSourceTrigger="PropertyChanged" />
            </TextBox>
        </StackPanel>

        <StackPanel Grid.Row="1" HorizontalAlignment="Center">
            <Label>The name you entered:</Label>
            <TextBlock Text="{Binding Source={StaticResource MyDataSource}, Path=Name}"/>
        </StackPanel>

    </Grid>
</Window>

src\Juster.Music\MainWindow.xaml.cs

/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
    }
    
}

UserModel.cs

public class UserModel : BindableBase
{
    private string name;
    // 调用父类的SetProperty()方法 
    public string Name { get => name; set { SetProperty<string>(ref name, value); } }
    public UserModel(){ }
}