WPF我没有让Label和Texblock之间的绑定起作用

using System.ComponentModel;

public class MainViewModel : INotifyPropertyChanged
{
    private string _text;
    public string Text
    {
        get { return _text; }
        set
        {
            _text = value;
            OnPropertyChanged(nameof(Text));
        }
    }

    public event PropertyChangedEventHandler PropertyChanged;
    protected void OnPropertyChanged(string propertyName)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }
}

<Window x:Class="YourNamespace.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <Window.DataContext>
        <local:MainViewModel Text="Hello, World!" />
    </Window.DataContext>
    <StackPanel>
        <Label Content="{Binding Text}" />
        <TextBlock Text="{Binding Text}" />
    </StackPanel>
</Window>