如何通过更改通知绑定到词典项？ [英] How to make binding to dictionary item with change notification?

问题描述

考虑以下XAML：

<Window x:Class="WpfApplication1.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">
    <StackPanel>
        <TextBlock Text="{Binding Dic[foo]}" />
        <Button Content="test" Click="Button_Click" />
    </StackPanel>
</Window>

和后备代码：

namespace WpfApplication1
{
    public partial class MainWindow : Window
    {
        public Dictionary<string, string> Dic { get; set; }

        public MainWindow()
        {
            InitializeComponent();
            Dic = new Dictionary<string, string>();
            Dic.Add("foo", "bar");
            DataContext = this;
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            // Doesn't work :(
            Dic["foo"] = "YEAH!";
        }
    }
}

在这里 TextBlock 可以正确地绑定到字典项 foo，但是当值改变时如何使其更新？

Here TextBlock properly binds to dictionary item "foo". But how to make it to update when its value is changed?

推荐答案

您需要使用 Binding.IndexerName 作为属性名称，您可能希望将其封装在继承或管理字典。

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