[英]How to keep my selection to the DataGrid Row after refresh the data grid using timer in WPF
我有WPF DataGrid,并且正在绑定DataGrid,但是如果对Data进行了任何更改,它将自动刷新,但是我对datagrid行的选择将未被选中。
Instead of using a List
to store the data, try using an ObservableCollection
. 与其使用
List
来存储数据, ObservableCollection
尝试使用ObservableCollection
。 The advantage of using the ObservableCollection
is that whenever you add an item to the collection the UI get automatically updated so a manually refresh of the DataGrid
is not required. 使用
ObservableCollection
的好处是,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
。 Below I have shared a sample application that adds and updates record in the DataGrid
. 下面,我共享了一个示例应用程序,该应用程序添加和更新了
DataGrid
记录。
XAML: 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>
Code Behind: 背后的代码:
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));
}
}
}
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.