brminnick / hackernews

A .NET MAUI app for displaying the top posts on Hacker News that demonstrates text sentiment analysis gathered using artificial intelligence

HackerNews

A .NET MAUI app for displaying the top posts on Hacker News.

This app demonstrates how to use IAsyncEnumerable + C# 8.0 to improve performance. Thanks to IAsyncEnumerable, the items are added to the list as soon as they're available making the app feel faster and more responsive.

This app also uses the Text Analytics API from Microsoft Cognitive Services to analyze the sentiment of each headline.

• 😃 Headline is Happy
• ☹️ Headline is Sad
• 😐 Headline is Neither Happy or Sad

hackernews's Issues

Question regarding `ConfigureAwait(false)`

Hi,

I have been trying to figure out a question of mine regarding:

HackerNews/src/HackerNews/ViewModels/NewsViewModel.cs

Lines 76 to 106 in aaad245

	try
	{
	await foreach (var story in GetTopStories(StoriesConstants.NumberOfStories).ConfigureAwait(false))
	{
	StoryModel? updatedStory = null;
	try
	{
	updatedStory = story with { TitleSentiment = await _textAnalysisService.GetSentiment(story.Title).ConfigureAwait(false) };
	}
	catch (Exception)
	{
	//Todo Add TextAnalysis API Key in TextAnalysisConstants.cs
	updatedStory = story;
	}
	finally
	{
	if (updatedStory is not null && !TopStoryCollection.Any(x => x.Title.Equals(updatedStory.Title)))
	InsertIntoSortedCollection(TopStoryCollection, (a, b) => b.Score.CompareTo(a.Score), updatedStory);
	}
	}
	}
	catch (Exception e)
	{
	OnPullToRefreshFailed(e.ToString());
	}
	finally
	{
	IsListRefreshing = false;
	}
	}

Basically, my question is: Is it OK to use ConfigureAwait(false) here:

HackerNews/src/HackerNews/ViewModels/NewsViewModel.cs

Line 78 in aaad245

await foreach (var story in GetTopStories(StoriesConstants.NumberOfStories).ConfigureAwait(false))

?

The reason I'm asking is that IsListRefreshing is not necessarily set on the UI thread:

HackerNews/src/HackerNews/ViewModels/NewsViewModel.cs

Line 104 in aaad245

IsListRefreshing = false;

And I wonder whether one can set view model properties (used in data bindings) on non-UI threads. Is it or is it not?

Best regards!

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What should I do with the navigation bar at the bottom and the Tab at the top? Can you give me a rough demo

Browser.OpenAsync did not open a new page

Browser.OpenAsync did not open a new page

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