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NewsService.cs
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NewsService.cs
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using System.Xml;
using AutoMapper;
using Microsoft.SyndicationFeed;
using Microsoft.SyndicationFeed.Rss;
using SimpleFeedReader.ViewModels;
namespace SimpleFeedReader.Services
{
public class NewsService
{
private readonly IMapper _mapper;
public NewsService(IMapper mapper)
{
_mapper = mapper;
}
public async Task<List<NewsStoryViewModel>> GetNews(string feedUrl)
{
var news = new List<NewsStoryViewModel>();
var feedUri = new Uri(feedUrl);
using (var xmlReader = XmlReader.Create(feedUri.ToString(),
new XmlReaderSettings { Async = true }))
{
try
{
var feedReader = new RssFeedReader(xmlReader);
while (await feedReader.Read())
{
switch (feedReader.ElementType)
{
// RSS Item
case SyndicationElementType.Item:
// <SnippetCreateNewsItem>
ISyndicationItem item = await feedReader.ReadItem();
var newsStory = _mapper.Map<NewsStoryViewModel>(item);
news.Add(newsStory);
// </SnippetCreateNewsItem>
break;
// Something else
default:
break;
}
}
}
catch (AggregateException ae)
{
throw ae.Flatten();
}
}
return news.OrderByDescending(story => story.Published).ToList();
}
}
// <SnippetConfigureAutoMapper>
public class NewsStoryProfile : Profile
{
public NewsStoryProfile()
{
// Create the AutoMapper mapping profile between the 2 objects.
// ISyndicationItem.Id maps to NewsStoryViewModel.Uri.
CreateMap<ISyndicationItem, NewsStoryViewModel>()
.ForMember(dest => dest.Uri, opts => opts.MapFrom(src => src.Id));
}
}
// </SnippetConfigureAutoMapper>
}