如何創建與成員變量的XAML綁定？

Question

我是XAML和數據綁定的新手。 我想定義在GUI控制MainWindow.xaml從在一個成員變量中獲取數據MainWindow.xaml.cs 。 為簡單起見，我只創建了一個顯示計數器的程序以及一個增加計數器的按鈕。

根據我查過的早期主題 ，我想出了以下代碼：

MainWindow.xaml.cs

using System;
using System.Collections.Generic;
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 XAMLBindingTest
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        private int Counter
        {
            get { return (int)GetValue(CounterProperty); }
            set { SetValue(CounterProperty, value); }
        }
        public static readonly DependencyProperty CounterProperty = 
            DependencyProperty.Register("Counter", typeof(int), typeof(MainWindow), new PropertyMetadata(null));

        public MainWindow()
        {
            Counter = 0;
            InitializeComponent();
        }

        private void incrementCounter(object sender, RoutedEventArgs e)
        {
            ++Counter;
        }
    }
}

MainWindow.xaml

<Window x:Class="XAMLBindingTest.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="140" Width="180">
    <Grid>
        <StackPanel HorizontalAlignment="Left" VerticalAlignment="Top">
            <TextBlock x:Name="txbCounter" HorizontalAlignment="Left" TextWrapping="Wrap" Text="{Binding Counter}" VerticalAlignment="Top"/>
            <Button x:Name="btnIncrement" Content="Increment" Width="75" Click="incrementCounter"/>
        </StackPanel>
    </Grid>
</Window>

此示例編譯，但TextBlock未顯示計數器值。 如何以正確的方式將TextBlock連接到Counter成員？

Answer 1

嘗試在窗口中添加“名稱”並使用“ElementName”綁定

<Window x:Class="XAMLBindingTest.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" Name="UI">
    <Grid>
        <StackPanel HorizontalAlignment="Left" VerticalAlignment="Top">
            <TextBlock x:Name="txbCounter" HorizontalAlignment="Left" TextWrapping="Wrap" Text="{Binding ElementName=UI, Path=Counter}" VerticalAlignment="Top"/>
            <Button x:Name="btnIncrement" Content="Increment" Width="75" Click="incrementCounter"/>
        </StackPanel>
    </Grid>

</Window>

Answer 2

如果我理解正確的話：

ItemSource="{Binding Path=TestData, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type common:LayoutAwarePage}}}"

TestData是在.xaml.cs文件中聲明的ObservableCollection類型的屬性。 ItemSource - 是您要綁定的示例屬性。

UPD2：

<ItemsControl ItemSource="{Binding Path=TestData, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type common:LayoutAwarePage}}}">
      <ItemsControl.ItemTemplate>
          <DataTemplate>
              <TextBlock Text="{Binding}" />
          </DataTemplate>
      </ItemsControl.ItemTemplate>
</ItemsControl>