Hi,@Santhosh Badam. Welcome to Microsoft Q&A.
Here is a complete example of how to implement database connection refresh functionality in a WPF application using the MVVM pattern and Entity Framework. You could try to refer to it.
xaml:
<StackPanel>
<Button Content="Refresh Database" Command="{Binding RefreshCommand}" />
</StackPanel>
Codebehind:
using Microsoft.EntityFrameworkCore;
using System.ComponentModel;
using System.Text;
using System.Timers;
using System.Windows;
using System.Windows.Input;
namespace WpfApp4
{
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
DataContext = new MainViewModel();
}
}
public class MainViewModel : INotifyPropertyChanged
{
public ICommand RefreshCommand { get; }
public MainViewModel()
{
RefreshCommand = new RelayCommand(async () => await RefreshDatabaseConnectionsAsync());
}
private async Task RefreshDatabaseConnectionsAsync()
{
await Task.Run(() =>
{
using (var context = new ApplicationDbContext())
{
context.Database.CloseConnection();
context.Database.OpenConnection();
}
});
OnDatabaseRefreshed();
}
private void OnDatabaseRefreshed()
{
// Notify other parts of your application if needed
}
public event PropertyChangedEventHandler PropertyChanged;
protected virtual void OnPropertyChanged(string propertyName)
{
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
}
public class RelayCommand : ICommand
{
private readonly Action _execute;
private readonly Func<bool> _canExecute;
public event EventHandler CanExecuteChanged;
public RelayCommand(Action execute, Func<bool> canExecute = null)
{
_execute = execute ?? throw new ArgumentNullException(nameof(execute));
_canExecute = canExecute;
}
public bool CanExecute(object parameter)
{
return _canExecute == null || _canExecute();
}
public void Execute(object parameter)
{
_execute();
}
public void RaiseCanExecuteChanged()
{
CanExecuteChanged?.Invoke(this, EventArgs.Empty);
}
}
public class ApplicationDbContext : DbContext
{
public ApplicationDbContext() : base()
{
// Initialize the DbContext as needed
}
protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
{
optionsBuilder.UseOracle("Your Oracle Connection String Here");
}
}
}
Best Regards,
Hui
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