public AsyncActionsCreator <State> NewsFetchActionAsync_1(TopStoriesCategory category)
{
return(async(dispatch, getState) => {
System.Diagnostics.Debug.WriteLine("NewsFetchAction...");
dispatch(new NewsFetchAction {
Category = category
});
await Task.Delay(1000);
System.Diagnostics.Debug.WriteLine("NewsFetchSuccessAction...");
dispatch(new NewsFetchSuccessAction {
Articles = new List <Article> {
new Article()
{
Url = "1"
},
new Article()
{
Url = "2"
},
new Article()
{
Url = "3"
}
}
});
});
}
public async Task <List <Article> > TopStories(TopStoriesCategory category)
{
var response = await this.RequestTopStories(category);
List <Article> articles = response != null ? response.Results : new List <Article> ();
return(articles);
}
public List <Article> TopStoriesSync(TopStoriesCategory category)
{
var assembly = this.GetType().GetTypeInfo().Assembly;
var textStreamReader = new StreamReader(assembly.GetManifestResourceStream("StartingPCL.Resources.top-stories.json"));
var json = textStreamReader.ReadToEnd();
var list = JsonConvert.DeserializeObject <List <Article> >(json);
return(list);
}
private void OnLoadMore()
{
var nextCategory = Enum.GetValues(typeof(TopStoriesCategory))
.Cast <TopStoriesCategory> ()
.SkipWhile(e => e != this.Category)
.Skip(1)
.FirstOrDefault();
this.Category = nextCategory;
this.ActionsFactory.NewsFetchActionAsync(this.Category).DispatchAsync();
}
public Task <List <Article> > TopStories(TopStoriesCategory category)
{
// var _assembly = Assembly.GetExecutingAssembly();
var assembly = this.GetType().GetTypeInfo().Assembly;
// _imageStream = assembly.GetManifestResourceStream("MyNamespace.MyImage.bmp");
var textStreamReader = new StreamReader(assembly.GetManifestResourceStream("StartingPCL.Resources.top-stories.json"));
var json = textStreamReader.ReadToEnd();
var list = Task.Factory.StartNew(() => JsonConvert.DeserializeObject <List <Article> >(json));
// var list = JsonConvert.DeserializeObject<List<Article>>(json);
return(list);
}
async Task <TopStoriesResponse> RequestTopStories(TopStoriesCategory category)
{
Log.Info("Request top stories: {0}", category.ToString());
// TopStoriesResponse res = await this.RestService.TopStories (TopStoriesApiKey, category);
// return res;
TopStoriesResponse res = null;
try {
res = await this.RestService.TopStories(TopStoriesApiKey, category);
return(res);
} catch (Exception ex) {
// TODO: Do not handle all exceptions
// TODO: Implement error handling
Debug.WriteLine($"Loading error: {ex}");
}
return(res);
}
// async Task FetchAllArticlesAsync ()
// {
// await this.FetchArticlesAsync (TopStoriesCategory.automobiles);
// await this.FetchArticlesAsync (TopStoriesCategory.travel);
// await this.FetchArticlesAsync (TopStoriesCategory.food);
// await this.FetchArticlesAsync (TopStoriesCategory.sports);
// await this.FetchArticlesAsync (TopStoriesCategory.arts);
// await this.FetchArticlesAsync (TopStoriesCategory.technology);
// await this.FetchArticlesAsync (TopStoriesCategory.business);
// await this.FetchArticlesAsync (TopStoriesCategory.magazine);
// await this.FetchArticlesAsync (TopStoriesCategory.realestate);
// await this.FetchArticlesAsync (TopStoriesCategory.obituaries);
// await this.FetchArticlesAsync (TopStoriesCategory.fashion);
// }
//
async Task FetchArticlesAsync(TopStoriesCategory category)
{
if (this.IsBusy)
{
return;
}
this.IsBusy = true;
try {
Debug.WriteLine($"[NewsListViewModel] FetchArticles {category.ToString()}...");
var loadTask = this.NewsService.TopStories(category);
var viewModels = await loadTask.ContinueWith(t => {
// Debug.WriteLine ($"AppBase.IsMainThread = {AppBase.IsMainThread}");
var objs = t.Result;
// create view models in background
var vms = from article in objs
select this.ViewModelsFactory.ArticleViewModel(article);
return(vms);
});
// TaskScheduler.FromCurrentSynchronizationContext()
this.Articles.AddRange(viewModels);
var count = this.Articles.Count;
this.Title = $"NY Times ({count} articles)";
this.IsBusy = false;
} catch (Exception ex) {
Debug.WriteLine(ex.ToString());
await this.Router.DisplayAlert("FetchArticlesAsync", ex.Message, "OK");
} finally {
this.IsBusy = false;
}
}
public AsyncActionsCreator <State> NewsFetchActionAsync(TopStoriesCategory category)
{
return(async(dispatch, getState) => {
Log.Info("NewsFetchAction...");
dispatch(new NewsFetchAction {
Category = category
});
try {
var models = await this.newsService.TopStories(category);
Log.Info($"NewsFetchSuccessAction... {models.Count}");
dispatch(new NewsFetchSuccessAction {
Articles = models
});
} catch (Exception ex) {
dispatch(new NewsFetchFailureAction {
Error = ex
});
}
});
}
public IAction CreateNewsFetchAction(TopStoriesCategory category)
{
return(new NewsFetchAction {
Category = category
});
}
