[c#] WORKING WITH ASYNCHRONOUS METHODS IN C#

출처 : http://gigi.nullneuron.net/gigilabs/working-with-asynchronous-methods-in-c/

Working with Asynchronous Methods in C#

 

반환값 없는 경우

private async void Button_Click(object sender, RoutedEventArgs e)
{
    await GetHtmlAsync();
}
 
private async Task GetHtmlAsync()
{
    var baseAddress = new Uri("http://mta.com.mt");
 
    using (var httpClient = new HttpClient() { BaseAddress = baseAddress })
    {
        var response = await httpClient.GetAsync("/");
        var content = await response.Content.ReadAsStringAsync();
 
        MessageBox.Show("Response arrived!", "Slow website");
    }
}

 

반환값이 있는 경우

private async void Button_Click(object sender, RoutedEventArgs e)
{
    string html = await GetHtmlAsync();
}
 
private async Task<string> GetHtmlAsync()
{
    var baseAddress = new Uri("http://mta.com.mt");
 
    using (var httpClient = new HttpClient() { BaseAddress = baseAddress })
    {
        var response = await httpClient.GetAsync("/");
        var content = await response.Content.ReadAsStringAsync();
 
        return content;
    }
}

 

Summary

1. Use async Task methods wherever you can.
2. Use async void methods for event handlers, but beware the dangers even there.
3. Use the –Async suffix in asynchronous method names to make them easily recognisable as awaitable.
4. Use Task.CompletedTask and Task.FromResult() to satisfy asynchronous contracts with synchronous code.
5. Asynchronous code in Main() has not been possible until recently. Use C# 7.1+ or a workaround to get this working.