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Async and Await - Asynchronous Programming
<Window x:Class="AsyncAwaitExample.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:AsyncAwaitExample"
mc:Ignorable="d"
Title="MainWindow" Height="350" Width="525">
<StackPanel>
<TextBlock Text="Enter number to sum:" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="0,50,0,0"/>
<TextBox Name="Input" Width="100" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="0,10,0,0" />
<Button Content="Calculate" HorizontalAlignment="Center" VerticalAlignment="Center" Width="75" Margin="0,10,0,0" Click="Button_Click"/>
<TextBlock Text="The sum is:" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="0,25,0,0"/>
<TextBlock Name="Answer" Text="" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="0,10,0,0"/>
</StackPanel>
</Window>
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
namespace AsyncAwaitExample
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
}
public async void DoSum(int number)
{
Console.WriteLine("Task started");
var result = Calculate(number);
Console.WriteLine("Task completed");
if (!result.IsCompleted)
await result;
Answer.Text = result.Result.ToString();
Console.WriteLine(string.Format("Answer is {0}", result.Result.ToString()));
}
public async Task<int> Calculate(int number)
{
var sum = 0;
Task myTask = new Task(() =>
{
for (int i = 1; i <= number; i++)
{
System.Threading.Thread.Sleep(1000);
sum += i;
}
});
myTask.Start();
await myTask;
return sum;
}
private void Button_Click(object sender, RoutedEventArgs e)
{
if (!string.IsNullOrEmpty(Input.Text))
{
Console.WriteLine("Sum process started");
var number = Convert.ToInt32(Input.Text);
DoSum(number);
Console.WriteLine("Sum process completed");
}
}
}
}
Owner

miteshsureja commented May 29, 2017

Output -

Sum process started
Task started
Task completed
Sum process completed
Answer is 55

image

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