[英]Why I can't bind static property with notification in .net core?
這些天我需要在 .Net5 中綁定一個靜態屬性。 我按照http://10rem.net/blog/2011/11/29/wpf-45-binding-and-change-notification-for-static-properties 中的教程來實現這一點。
XAML:
<Window x:Class="WpfApp1.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:WpfApp1"
mc:Ignorable="d"
Title="MainWindow" Height="450" Width="800">
<Grid>
<Grid.RowDefinitions>
<RowDefinition></RowDefinition>
<RowDefinition></RowDefinition>
</Grid.RowDefinitions>
<TextBlock Text="{Binding Source={x:Static local:MainWindow.ResultText}}"></TextBlock>
<Button Grid.Row="1" Click="Button_Click">Add</Button>
</Grid>
</Window>
代碼隱藏:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
namespace WpfApp1
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
static string _ResultText = "0";
public static string ResultText
{
get => _ResultText; set
{
_ResultText = value;
NotifyStaticPropertyChanged("ResultText");
}
}
public MainWindow()
{
InitializeComponent();
this.DataContext = this;
}
private void Button_Click(object sender, RoutedEventArgs e)
{
int i = Convert.ToInt32(_ResultText)+1;
ResultText = i.ToString() ;
}
public static event EventHandler<PropertyChangedEventArgs> StaticPropertyChanged;
private static void NotifyStaticPropertyChanged(string propertyName)
{
if (StaticPropertyChanged != null)
StaticPropertyChanged(null, new PropertyChangedEventArgs(propertyName));
}
}
}
程序運行后,盡管值發生了變化,但 UI 沒有任何變化。
我的代碼有什么問題? 謝謝你。
您的綁定語法錯誤。 如果您使用正確的語法(如您所引用的文章中所示),則它可以正常工作:
<TextBlock Text="{Binding Path=(local:MainWindow.ResultText)}"/>
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