如何将更新推迟到WPF中的绑定

        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:WpfApp1"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
   <StackPanel>
       <TextBox x:Name="txtName" Text="{Binding Name, UpdateSourceTrigger=Explicit}" Width="200" Margin="5"/>
       <Button Content="Update" Click="Button_Click" Margin="5"/>
    </StackPanel>
</Window>

private void Button_Click(object sender, RoutedEventArgs e)
{
    BindingExpression be = txtName.GetBindingExpression(TextBox.TextProperty);
    be.UpdateSource();
}