INotifyPropertyChanged不适用于传统绑定，但适用于编译绑定

问题描述

如果我做错了什么或者我缺少什么，我不会，但是当我使用编译时绑定进行操作时INotifyPropertyChanged可以工作，而使用传统绑定进行操作时则无法工作。

I don't if I am doing something wrong or if there is something I am missing but the INotifyPropertyChanged works when I do it with compile time binding and doesn't work when I do it with traditional binding.

public class Students : INotifyPropertyChanged
{

    private string name;
    private string surname;


    public event PropertyChangedEventHandler PropertyChanged;

    private void NotifyPropertyChanged([CallerMemberName] string propertyName = "")
    {
        if (PropertyChanged != null)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }
    }

    public string Name
    {
        get { return name; }
        set
        {
            if(value != name)
            {
                name = value;
                NotifyPropertyChanged();
            }

        }
    }

    public string Surname
    {
        get { return surname; }
        set
        {
            if (value != surname)
            {
                surname = value;
                NotifyPropertyChanged();
            }

        }
    }

    public Students()
    {
        Name = "John";
        Surname = "Smith";
    }


}

MainPage.xaml

MainPage.xaml

<Page.DataContext>
    <local:Students/>
</Page.DataContext>

<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">

    <StackPanel Margin="0,200,0,0">
        <TextBlock Text="{Binding Name}"/>
        <TextBlock Text="{Binding Surname}"/>
        <Button Content="Change Name" Click="change_name"/>
        <Button Content="Change Surname" Click="change_surname"/>
    </StackPanel>

</Grid>

MianPage.xaml.cs

MianPage.xaml.cs

public sealed partial class MainPage : Page
{
    Students st;
    public MainPage()
    {
        this.InitializeComponent();
        st = new Students();
    }

    private void change_name(object sender, RoutedEventArgs e)
    {
        st.Name = "MM";
    }

    private void change_surname(object sender, RoutedEventArgs e)
    {
        st.Surname = "SS";
    }
}

我真的很困惑，因为当您绑定编译时时间绑定，效果很好。

I am really confused, because when you bind with compile time binding, it works fine. What's going on?

推荐答案

我看不到要在其中将当前DataContext设置为对象的任何地方。

I don't see any place in which you are setting the current DataContext to your object.

 public MainPage()
    {
        this.InitializeComponent();
        st = new Students();
        this.DataContext = st;
    }

OR ：您正在设置数据上下文XAML，但您没有引用它。

OR: You are setting a datacontext in your XAML, but you aren't referencing it.

<Page.DataContext>
<local:Students/>
</Page.DataContext>

如果要使用该对象，则需要从代码中引用该对象。

You would need to reference that object from code if you intend to use it.

 private void change_name(object sender, RoutedEventArgs e)
    {
        ((Students)this.DataContext).Name = "MM";
    }

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