WPF练习开发扫雷时StackPanel的DataContext无法找到row对象问题

修复步骤 #

• 修正MainWindow上下文绑定源问题
• 修复RowUpper类属性递归、通知不匹配、计时器失效问题
• 调整XAML绑定逻辑

1. 修改MainWindow.xaml.cs #

原代码中row是构造函数局部变量，绑定无法访问，改为公共属性并指定窗口DataContext：

public partial class MainWindow : Window
{
    // 改为公共属性，绑定才能识别访问
    public RowUpper row { get; set; }
    public MainWindow()
    {
        InitializeComponent();
        row = new RowUpper();
        // 指定窗口DataContext为当前实例，{Binding row}才能找到对应源
        this.DataContext = this;
        // 启动计时器测试
        RowUpper.ResetTimer();
    }
    // 其余业务代码保持不变
}

2. 修改RowUpper.cs #

修复属性递归、通知参数错误、计时器自动释放、跨线程更新问题：

namespace MineSweeper
{
    public class RowUpper : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged = delegate { };
        // 私有字段存储属性值，避免递归调用
        private string _timeshown;
        private static int _time = 0;
        // 静态存储计时器，避免using作用域结束后被自动释放
        private static Timer _timer;
        public static RowUpper row = new RowUpper();
        
        public string timeshown
        {
            get
            {
                return _timeshown;
            }
            set
            {
                _timeshown = value;
                // 通知参数名和属性名保持完全一致才能触发UI更新
                PropertyChanged(this, new PropertyChangedEventArgs(nameof(timeshown)));
            }
        }

        public static void ResetTimer()
        {   
            _time = 0;
            _timer = new Timer(1000);
            _timer.Elapsed += OnTimedEvent;
            _timer.Start();
        }

        private static void OnTimedEvent(object source, System.Timers.ElapsedEventArgs e)
        {
            _time++;
            // 用静态实例更新属性触发通知
            row.timeshown = _time.ToString();
        }
    }
}

3. 修改MainWindow.xaml #

移除重复的DataContext设置，直接绑定Text属性即可：

<Window x:Class="MineSweeper.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:minesweeper="clr-namespace:MineSweeper" 
        mc:Ignorable="d"
        Title="MineSweeper" Height="920" Width="920">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="80"/>
            <RowDefinition Height="900"/>
        </Grid.RowDefinitions>
        <StackPanel x:Name="Stackpanel" Grid.Row="0" DataContext="{Binding row}"  VerticalAlignment="Top" Height="80">
            <Grid>
                <Grid.RowDefinitions>
                    <RowDefinition Height="40"/>
                    <RowDefinition Height="40"/>
                </Grid.RowDefinitions>
               
                <!--其余控件代码保持不变-->
                
                <!--去掉TextBox的DataContext设置，直接绑定Text属性-->
                <TextBox x:Name="ZeitAnzeigeTB" TextAlignment="Right" Text="{Binding timeshown}" Width="389" Height="40" HorizontalAlignment="Left" FontSize="25" Grid.Row="1" IsReadOnly="True" Margin="70 0 0 0" BorderThickness="0" IsTabStop="True"/>
                <!--其余控件代码保持不变-->
            </Grid>
        </StackPanel>
    </Grid>
</Window>

内容的提问来源于stack exchange，提问作者birni