Question

我遇到了一个问题，我有一个对象列表，让我们说人：

class Person : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;
    private string _name;
    private string _surname;
    public string name
    {
        get { return _name; }
        set { SetField(ref _name, value, "name"); }

    }
    public string surname
    {
        get { return _surname; }
        set { SetField(ref _surname, value, "surname"); }

    }
    protected virtual void OnPropertyChanged(string propertyName)
    {
        PropertyChangedEventHandler handler = PropertyChanged;
        if (handler != null)
        {
            handler(this, new PropertyChangedEventArgs(propertyName));

        }
    }
    protected bool SetField<T>(ref T field, T value, string propertyName)
    {
        if (EqualityComparer<T>.Default.Equals(field, value)) return false;
        field = value;
        OnPropertyChanged(propertyName);
        return true;
    }
}

和XAML：

<TextBlock HorizontalAlignment="Left" Margin="310,167,0,0" TextWrapping="Wrap" Text="{Binding Path=name}" VerticalAlignment="Top" FontSize="36"/>
    <TextBlock HorizontalAlignment="Left" Margin="585,167,0,0" TextWrapping="Wrap" Text="{Binding Path=surname}" VerticalAlignment="Top" FontSize="36"/>
    <Button Content="Button" HorizontalAlignment="Left" Margin="721,355,0,0" VerticalAlignment="Top" Click="Button_Click"/>

在初始页面上我执行此操作：

List<Person> Persons = new List<Person>();
    public MainPage()
    {
        this.InitializeComponent();

        Person a = new Person();
        a.name = "First";
        a.surname = "FirstSurname";
        Persons.Add(a);
        Person b = new Person();
        b.name = "Second";
        b.surname = "SecondSurname";
        Persons.Add(b);
        this.DataContext = Persons[0];
    }

我不想更改属性，但更改整个对象：

private void Button_Click(object sender, RoutedEventArgs e)
    {

        Person a = new Person();
        a.name = "Test";
        a.surname = "Test";
        Persons[0] = a;
    }

如何让TextBlocks自动重新获取数据？不做这个.DataContext = Persons [0];再次

Answer 1

在 TextBlock 的文字属性中，尝试将 UpdateSourceTrigger 设置为 PropertyChanged ：

Text="{Binding Path=name, UpdateSourceTrigger=PropertyChanged}"

DataBinding到List中的对象

1 个答案: