CODEWITHSUNDEEP
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staff614
staff614

Reputation: 91

C# - How not make WPF UI Freeze while elaborating

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
        }

Upvotes: 0

Views: 640

Answers (1)

Clemens
Clemens

Reputation: 128146

One straighforward approach for running a background operation in an event handler is to declare the event handler async and run and await a Task:

private async void btn_Start_Click(object sender, RoutedEventArgs e)
{
     // prevent click while operation in progress
     btn_Start.IsEnabled = false;

     pb_loader.IsIndeterminate = true;

     // access UI elements before running the Task
     var mail = txtMail.Text + idIniziale + "@mail.local";
     ...

     await Task.Run(() =>
     {
         // perform background operation
         // use local variables "mail" etc. here
     });

     pb_loader.IsIndeterminate = false;

     btn_Start.IsEnabled = true;
}

Upvotes: 5

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