Question

我正在尝试在DataBinding类型的ComboBox中的可编辑myStrings和设置Properties.Settings.Default之间创建双向System.Collections.Specialized.StringCollection。

在我的示例中，Properties.Settings.Default.myStrings中的代码只被加载到ComboBox中一次。使用button_Click()更新和保存设置（名为＆＃34的按钮;填充＆＃34;）不会更新ComboBox。我必须重新启动应用才能看到更改。

打字＆＃34;梨＆＃34;在ComboBox中并使用button_Click()保存设置（按钮名为＆＃34; fill2＆＃34;），根本不做任何事情。

我想要实现的目标是：

ComboBox应始终显示Properties.Settings.Default.myStrings的当前内容，即使设置已更新。
Properties.Settings.Default.myStrings应该更新并保存。

MainWindow.xaml

<Window
        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:comboBoxDataBinding"
        xmlns:Properties="clr-namespace:comboBoxDataBinding.Properties" x:Class="comboBoxDataBinding.MainWindow"
        mc:Ignorable="d"
        Title="MainWindow" Height="212" Width="318">
    <Window.DataContext>
        <Properties:Settings/>
    </Window.DataContext>
    <Window.Resources>
        <local:MyStringsConverter x:Key="MyStringsConverter"/>
    </Window.Resources>
    <Grid>
        <ComboBox x:Name="comboBox" Margin="10,10,10,10" VerticalAlignment="Top" IsEditable="True" ItemsSource="{Binding myStrings, Mode=TwoWay, UpdateSourceTrigger=LostFocus}"/>
        <Button x:Name="button" Content="fill" HorizontalAlignment="Left" Margin="21,86,0,0" VerticalAlignment="Top" Width="75" Click="button_Click"/>
        <Button x:Name="button1" Content="fill2" HorizontalAlignment="Left" Margin="21,111,0,0" VerticalAlignment="Top" Width="75" Click="button1_Click"/>
    </Grid>
</Window>

MainWindow.xaml.cs

using System;
using System.Globalization;
using System.Windows;
using System.Windows.Data;

namespace comboBoxDataBinding {
    /// <summary>
    /// Interaktionslogik für MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window {
        public MainWindow() {
            InitializeComponent();
        }

        private void button_Click(object sender, RoutedEventArgs e) {
            System.Collections.Specialized.StringCollection sc = Properties.Settings.Default.myStrings;
            sc.Add("Apple");
            sc.Add("Orange");
            Properties.Settings.Default.myStrings = sc;
            Properties.Settings.Default.Save();
        }

        private void button1_Click(object sender, RoutedEventArgs e) {
            Properties.Settings.Default.Save();
        }
    }
    class MyStringsConverter : IValueConverter {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture) {
            return value;
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture) {
            return value;
        }
    }
}

ComboBox与Properties.Settings的双向数据绑定

0 个答案: