我有一个按钮，单击它后会在远程数据库中循环发送大量数据，但在此操作期间，整个 wpf UI 都冻结了。我的目标是让加载程序在处理数据库中的所有内容时工作。我的按钮代码：

 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
        }

回答

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;
}