如何在WPF中使用计时器刷新数据网格后，将我的选择保留在数据网格行中

不要使用List来存储数据，而是尝试使用ObservableCollection。使用ObservableCollection的优点是，每当您向集合中添加项目时，UI都会自动更新，因此不需要手动刷新DataGrid。下面我分享了一个示例应用程序，它在DataGrid中添加和更新记录。

XAML:

<Grid>
    <Grid.RowDefinitions>
        <RowDefinition Height="Auto"/>
        <RowDefinition Height="Auto"/>
    </Grid.RowDefinitions>
    <StackPanel Orientation="Horizontal">
        <RadioButton Name="CBAdd" GroupName="AddOrEdit" Content="Add Messages" IsChecked="True"></RadioButton>
        <RadioButton Name="CBUpdate" GroupName="AddOrEdit" Content="Update Messages"></RadioButton>
    </StackPanel>
    <DataGrid Grid.Row="1" Name="DGNew" CanUserAddRows="False">
    </DataGrid>
</Grid>

代码背后：

using System;
using System.Windows;
using System.Timers;
using System.Collections.ObjectModel;
using System.Windows.Threading;
using System.ComponentModel;
namespace WpfApplication1
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        Timer _timer = null;
        ObservableCollection<CustomMessage> _messages = null;
        int count = 0;
        public MainWindow()
        {
            InitializeComponent();
            _messages = new ObservableCollection<CustomMessage>();
            count++;
            _messages.Add(new CustomMessage() { ID = count, Message = "Message" });
            _timer = new Timer(1000);
            _timer.Elapsed += new ElapsedEventHandler(_timer_Elapsed);
            this.DGNew.ItemsSource = _messages;
            _timer.Start();
        }
        void _timer_Elapsed(object sender, ElapsedEventArgs e)
        {
            try
            {
                _timer.Stop();
                Application.Current.Dispatcher.Invoke(DispatcherPriority.Background, new Action(() =>
                {
                    if (this.CBAdd.IsChecked == true)
                    {
                        count++;
                        _messages.Add(new CustomMessage() { ID = count, Message = "Timer Message " + count });
                    }
                    else
                    {
                        // Udpate existing Message
                        Random random = new Random();
                        CustomMessage message = _messages[random.Next(0, count)];
                        message.Message = "Updated Time" + DateTime.Now.ToLongTimeString();
                    }
                }));
            }
            finally
            {
                _timer.Start();
            }
        }
    }
    public class CustomMessage : INotifyPropertyChanged
    {
        private int _ID;
        public int ID
        {
            get { return _ID; }
            set
            {
                _ID = value;
                OnPropertyChanged("ID");
            }
        }
        private string _Message;
        public string Message
        {
            get { return _Message; }
            set
            {
                _Message = value;
                OnPropertyChanged("Message");
            }
        }
        public event PropertyChangedEventHandler PropertyChanged;
        public void OnPropertyChanged(string propertyName)
        {
            if (PropertyChanged != null)
                PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }
    }
}