Implement Application.DoEvents in WPF : Application « Windows Presentation Foundation « C# / C Sharp

1. C# / C Sharp
2. Windows Presentation Foundation
3. Application

Implement Application.DoEvents in WPF

  
<Window x:Class="WpfApplication1.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="WPF" Height="200" Width="300">
    <StackPanel>
        <Button x:Name="btnWithout" Click="btnWithout_Click">Without DoEvents</Button>
        <Button x:Name="btnWith" Click="btnWith_Click">With DoEvents</Button>
        <ListBox x:Name="listBox"/>

    </StackPanel>
</Window>

//File:Window.xaml.cs

using System.Windows;
using System.Windows.Threading;

namespace WpfApplication1
{
    public partial class Window1 : Window
    {
        private delegate void EmptyDelegate();
        public Window1()
        {
            InitializeComponent();
        }

        private void btnWithout_Click(object sender, RoutedEventArgs e)
        {
            LoadNumbers(false);
        }

        private void btnWith_Click(object sender, RoutedEventArgs e)
        {
            LoadNumbers(true);
        }

        private void LoadNumbers(bool callDoEvents)
        {
            listBox.Items.Clear();

            btnWithout.IsEnabled = false;
            btnWith.IsEnabled = false;

            for(int i = 1; i <= 10000; i++)
            {
                listBox.Items.Add("Number " + i.ToString());
                if(callDoEvents){
                    DoEvents();
                }
                
            }
            btnWithout.IsEnabled = true;
            btnWith.IsEnabled = true;
        }
        public static void DoEvents()
        {
            Dispatcher.CurrentDispatcher.Invoke(DispatcherPriority.Background,new EmptyDelegate(delegate{}));
        }


    }
}

   
    
  

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