C# - How not make WPF UI Freeze while elaborating

Question

I have a button that after I click it send a lot of data in a remote database with a loop, but during this operation whole wpf UI is freezing. My goal is to make the loader work while it is processing everything with the database. My button code:

 private void btn_Start_Click(object sender, RoutedEventArgs e)
        {
            pb_loader.IsIndeterminate = true; //<- it has to start to make animation

            IEmailService emailService = new EmailService();
            IUserQueryService emailQueryService = new UserQueryService();
            var idIniziale = int.Parse(txtIdIniziale.Text);
            var idFinale = int.Parse(txtIdFinale.Text);
            var n = idFinale - idIniziale;
            string mail = "";
            for(int i=0; i<=n; i++)
            {
                mail = txtMail.Text + idIniziale + "@mail.local";
                var exist = emailQueryService.CheckUserExist(mail); //<- db operation method
                if (exist == false)
                {
                   var lastUniqueId = emailQueryService.GetLastUniqueId();//<- db operation method
                   lastUniqueId = lastUniqueId + 1;
                   var idUtente = emailService.SalvaUtente(mail, lastUniqueId); //<- db operation method
                   emailService.AssegnaReferente(idUtente, txtMail.Text);//<- db operation method
                   emailService.AssegnaRuoli(idUtente); //<- db operation method

                }
                idIniziale++;
            }
            pb_loader.IsIndeterminate = false; //<- it has to end animation of loading
        }

Answer 1

To prevent your WPF (Windows Presentation Foundation) UI from freezing during lengthy operations, you need to ensure that these operations do not run on the UI thread. Here are some strategies to achieve this:

Use Asynchronous Programming

Task-Based Asynchronous Pattern (TAP): Use async and await keywords to perform operations asynchronously. This keeps the UI responsive while the operation completes.

csharpCopy code
private

BackgroundWorker: This is an older approach but still valid for performing background operations. It provides progress reporting and completion handling.

csharpCopy code
private

Use Dispatcher to Update UI

When you need to update the UI from a background thread, use the Dispatcher to marshal the update back to the UI thread.

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private

Summary

Use async and await for asynchronous operations. Use BackgroundWorker for background processing with progress reporting. Use Dispatcher to update the UI from a background thread.

By following these strategies, you can keep your WPF UI responsive and prevent it from freezing during long-running operations.To prevent your WPF (Windows Presentation Foundation) UI from freezing during lengthy operations, you need to ensure that these operations do not run on the UI thread. Here are some strategies to achieve this:

Use Asynchronous Programming

Task-Based Asynchronous Pattern (TAP): Use async and await keywords to perform operations asynchronously. This keeps the UI responsive while the operation completes.

csharp
private

BackgroundWorker: This is an older approach but still valid for performing background operations. It provides progress reporting and completion handling.

csharp
private

Use Dispatcher to Update UI

When you need to update the UI from a background thread, use the Dispatcher to marshal the update back to the UI thread.

csharp
private

Summary

Use async and await for asynchronous operations.

Use BackgroundWorker for background processing with progress reporting.

Use Dispatcher to update the UI from a background thread.

By following these strategies, you can keep your WPF UI responsive and prevent it from freezing during long-running operations.