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Add example of IAsyncEnumerable version of RSS reader
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| <CascadingAuthenticationState> | ||
| <Router AppAssembly="typeof(Startup).Assembly"> | ||
| <NotFoundContent> | ||
| <p>Sorry, there's nothing at this address.</p> | ||
| </NotFoundContent> | ||
| </Router> | ||
| </CascadingAuthenticationState> |
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| @page "/" | ||
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| <RssBox></RssBox> | ||
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projects/blazor-ss/RssReader-2/Components/Pages/RssBox.razor
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| @using Microsoft.SyndicationFeed | ||
| @inject RssNews rss | ||
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| <h1>RSS News </h1> | ||
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| <ul> | ||
| @foreach(var n in News) | ||
| { | ||
| <li>@((MarkupString)n.Description)</li> | ||
| } | ||
| </ul> | ||
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| @code | ||
| { | ||
| List<SyndicationItem> News {get; set;} = new List<SyndicationItem>(); | ||
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| protected override async Task OnInitAsync() | ||
| { | ||
| var feeds = new string[] | ||
| { | ||
| "http://scripting.com/rss.xml", | ||
| "https://hnrss.org/jobs", | ||
| "https://hnrss.org/newest", | ||
| "http://feeds.bbci.co.uk/news/rss.xml", | ||
| "http://feeds.bbci.co.uk/news/world/rss.xml", | ||
| "http://feeds.bbci.co.uk/news/uk/rss.xml", | ||
| "http://feeds.bbci.co.uk/news/business/rss.xml", | ||
| "http://feeds.bbci.co.uk/news/politics/rss.xml", | ||
| "http://feeds.bbci.co.uk/news/health/rss.xml", | ||
| "http://feeds.bbci.co.uk/news/education/rss.xml", | ||
| "http://feeds.bbci.co.uk/news/entertainment_and_arts/rss.xml" | ||
| }; | ||
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| await foreach(var news in rss.GetMultipleNewsAsync(feeds)) | ||
| { | ||
| foreach(var n in news) | ||
| { | ||
| News.Insert(0, n); | ||
| } | ||
| this.StateHasChanged(); | ||
| } | ||
| } | ||
| } |
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| @using System.Net.Http | ||
| @using Microsoft.AspNetCore.Components.Forms | ||
| @using Microsoft.AspNetCore.Components.Layouts | ||
| @using Microsoft.AspNetCore.Components.Routing | ||
| @using Microsoft.JSInterop | ||
| @using RssReader.Services |
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| @page "/" | ||
| <!DOCTYPE html> | ||
| <html> | ||
| <head> | ||
| <meta charset="utf-8" /> | ||
| <meta name="viewport" content="width=device-width, initial-scale=1.0" /> | ||
| <title>RSS Reader</title> | ||
| <base href="~/" /> | ||
| <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" | ||
| asp-fallback-href="css/bootstrap/bootstrap.min.css" | ||
| asp-fallback-test-class="sr-only" asp-fallback-test-property="position" asp-fallback-test-value="absolute" | ||
| crossorigin="anonymous" | ||
| integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T"/> | ||
| <link href="css/site.css" rel="stylesheet" /> | ||
| </head> | ||
| <body> | ||
| <app></app> | ||
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| <script src="_framework/blazor.server.js"></script> | ||
| </body> | ||
| </html> |
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| @using RssReader.Components | ||
| @namespace RssReader.Pages | ||
| @addTagHelper *, Microsoft.AspNetCore.Mvc.TagHelpers |
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| using Microsoft.AspNetCore.Hosting; | ||
| using Microsoft.AspNetCore.Builder; | ||
| using Microsoft.Extensions.Hosting; | ||
| using Microsoft.Extensions.DependencyInjection; | ||
| using RssReader.Services; | ||
| using RssReader.Components; | ||
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| namespace RssReader | ||
| { | ||
| public class Startup | ||
| { | ||
| public void ConfigureServices(IServiceCollection services) | ||
| { | ||
| services.AddRazorPages(); | ||
| services.AddServerSideBlazor(); | ||
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| services.AddSingleton<RssNews>(); | ||
| } | ||
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| // This method gets called by the runtime. Use this method to configure the HTTP request pipeline. | ||
| public void Configure(IApplicationBuilder app, IHostEnvironment env) | ||
| { | ||
| if (env.IsDevelopment()) | ||
| { | ||
| app.UseDeveloperExceptionPage(); | ||
| } | ||
| else | ||
| { | ||
| // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts. | ||
| app.UseHsts(); | ||
| } | ||
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| app.UseHttpsRedirection(); | ||
| app.UseStaticFiles(); | ||
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| app.UseRouting(); | ||
| app.UseEndpoints(routes => | ||
| { | ||
| routes.MapRazorPages(); | ||
| routes.MapFallbackToPage("/Index"); | ||
| routes.MapBlazorHub<App>("app"); | ||
| }); | ||
| } | ||
| } | ||
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| public class Program | ||
| { | ||
| public static void Main(string[] args) | ||
| { | ||
| CreateHostBuilder(args).Build().Run(); | ||
| } | ||
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| public static IHostBuilder CreateHostBuilder(string[] args) => | ||
| Host.CreateDefaultBuilder(args) | ||
| .ConfigureWebHostDefaults(webBuilder => | ||
| { | ||
| webBuilder.UseStartup<Startup>(); | ||
| webBuilder.UseEnvironment(Environments.Development); | ||
| }); | ||
| } | ||
| } |
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| # Rss Reader | ||
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| This version of RSS Reader uses C# 8.0 `IAsyncEnumerable` to process RSS data as they are available. There is an artificial `await Task.Delay(3000);` added to `RssNews.GetNewsAsync` so you can see visually how the UI changes. |
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| <Project Sdk="Microsoft.NET.Sdk.Web"> | ||
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| <PropertyGroup> | ||
| <TargetFramework>netcoreapp3.0</TargetFramework> | ||
| <LangVersion>8.0</LangVersion> | ||
| </PropertyGroup> | ||
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| <ItemGroup> | ||
| <PackageReference Include="Microsoft.SyndicationFeed.ReaderWriter" Version="1.0.0" /> | ||
| </ItemGroup> | ||
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| <ItemGroup> | ||
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| <Watch Include="**\*.cshtml" /> | ||
| <Watch Include="**\*.razor" /> | ||
| </ItemGroup> | ||
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| </Project> |
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| using System.Collections.Generic; | ||
| using System.Threading.Tasks; | ||
| using Microsoft.SyndicationFeed; | ||
| using Microsoft.SyndicationFeed.Rss; | ||
| using System.Xml; | ||
| using System.Text; | ||
| namespace RssReader.Services | ||
| { | ||
| public class RssNews | ||
| { | ||
| public async IAsyncEnumerable<List<SyndicationItem>> GetMultipleNewsAsync(params string[] news) | ||
| { | ||
| foreach (var x in news) | ||
| { | ||
| yield return await GetNewsAsync(x); | ||
| } | ||
| } | ||
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| public async Task<List<SyndicationItem>> GetNewsAsync(string url) | ||
| { | ||
| var items = new List<SyndicationItem>(); | ||
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| using (var xmlReader = XmlReader.Create(url, new XmlReaderSettings { Async = true })) | ||
| { | ||
| var feedReader = new RssFeedReader(xmlReader); | ||
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| while (await feedReader.Read()) | ||
| { | ||
| switch (feedReader.ElementType) | ||
| { | ||
| case SyndicationElementType.Item: | ||
| ISyndicationItem item = await feedReader.ReadItem(); | ||
| items.Add(new SyndicationItem(item)); | ||
| break; | ||
| default: | ||
| break; | ||
| } | ||
| } | ||
| } | ||
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| await Task.Delay(3000); | ||
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| return items; | ||
| } | ||
| } | ||
| } |
Empty file.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,25 @@ | ||
| <!DOCTYPE html> | ||
| <html> | ||
|
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| <head> | ||
| <meta charset="utf-8" /> | ||
| <meta name="viewport" content="width=device-width" /> | ||
| <title>Rss Reader</title> | ||
| <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" | ||
| crossorigin="anonymous"> | ||
| <base href="/" /> | ||
| </head> | ||
|
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| <body> | ||
| <app>Loading...</app> | ||
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| <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" | ||
| crossorigin="anonymous"></script> | ||
| <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1" | ||
| crossorigin="anonymous"></script> | ||
| <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" | ||
| crossorigin="anonymous"></script> | ||
| <script src="_framework/components.server.js"></script> | ||
| </body> | ||
|
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| </html> |