Display a warning if XML parsing error is encountered

ref #75

PodcastRewind/Pages/Setup.cshtml

@@ -10,12 +10,25 @@
 <div class="d-flex flex-row justify-content-start align-items-center mb-3 bg-secondary bg-opacity-10 p-2 rounded">
     @if (!string.IsNullOrEmpty(Model.PodcastImageUrl))
     {
-        <img class="img-fluid rounded me-2" src="@Model.PodcastImageUrl" height="100" width="100" alt="" />
+        <img class="img-fluid rounded" src="@Model.PodcastImageUrl" height="100" width="100" alt="" />
     }
-    <h2>@Model.PodcastTitle</h2>
+    <h2 class="m-2">@Model.PodcastTitle</h2>
 </div>
 
-@if (Model.PodcastEpisodes.Count == 0)
+@if (Model.XmlParsingError)
+{
+    <div class="alert alert-warning" role="alert">
+        Whoops! There's a
+        <a class="alert-link" href="https://github.com/dougwaldron/podcast-rewind/issues/75">
+            bug in Microsoft's feed parsing library
+        </a> 
+        that prevents some feeds from working, including this one. Unfortunately, there's nothing I can do about it 
+        until Microsoft fixes it. I've already sent them
+        <a class="alert-link" href="https://github.com/dotnet/runtime/pull/99194">code that fixes the issue</a>.
+        If you want, you can go there and express your support.
+    </div>
+}
+else if (Model.PodcastEpisodes.Count == 0)
 {
     <p>That podcast feed doesn't seem to have any episodes!</p>
 }
@@ -77,5 +90,5 @@ else
 
 @section Scripts
 {
-<partial name="_ValidationScriptsPartial" />
+    <partial name="_ValidationScriptsPartial" />
 }

PodcastRewind/Pages/Setup.cshtml.cs

@@ -1,8 +1,8 @@
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.AspNetCore.Mvc.RazorPages;
-using PodcastRewind.Services;
-using System.ServiceModel.Syndication;
 using PodcastRewind.Models.Dto;
+using PodcastRewind.Services;
+using System.Xml;
 
 namespace PodcastRewind.Pages;
 
@@ -15,6 +15,7 @@ public class SetupModel(IFeedRewindInfoRepository repository, ISyndicationFeedSe
     public string PodcastTitle { get; private set; } = string.Empty;
     public string PodcastImageUrl { get; private set; } = string.Empty;
     public List<ViewPodcastEpisodeDto> PodcastEpisodes { get; private set; } = [];
+    public bool XmlParsingError { get; private set; }
 
     public async Task<IActionResult> OnGetAsync(string? feedUrl, int interval = 7)
     {
@@ -24,7 +25,18 @@ public async Task<IActionResult> OnGetAsync(string? feedUrl, int interval = 7)
         var feed = await feedService.GetSyndicationFeedAsync(feedUrl);
         if (feed is null) return NotFound();
 
-        LoadData(feed);
+        PodcastTitle = feed.Title.Text;
+        PodcastImageUrl = feed.ImageUrl?.ToString() ?? "";
+        try
+        {
+            PodcastEpisodes = feed.Items.Select(item => new ViewPodcastEpisodeDto(item))
+                .OrderBy(dto => dto.PublishDate).ToList();
+        }
+        catch (XmlException e)
+        {
+            XmlParsingError = true;
+            return Page();
+        }
 
         if (PodcastEpisodes.Count > 0)
         {
@@ -46,19 +58,14 @@ public async Task<IActionResult> OnPostAsync()
             var feed = await feedService.GetSyndicationFeedAsync(CreateFeedRewindInfo.FeedUrl);
             if (feed is null) return NotFound();
 
-            LoadData(feed);
+            PodcastTitle = feed.Title.Text;
+            PodcastEpisodes = feed.Items.Select(item => new ViewPodcastEpisodeDto(item))
+                .OrderBy(dto => dto.PublishDate).ToList();
+            PodcastImageUrl = feed.ImageUrl?.ToString() ?? "";
             return Page();
         }
 
         var id = await repository.SaveAsync(CreateFeedRewindInfo);
         return RedirectToPage("Details", new { id });
     }
-
-    private void LoadData(SyndicationFeed feed)
-    {
-        PodcastTitle = feed.Title.Text;
-        PodcastEpisodes = feed.Items.Select(item => new ViewPodcastEpisodeDto(item))
-            .OrderBy(dto => dto.PublishDate).ToList();
-        PodcastImageUrl = feed.ImageUrl?.ToString() ?? "";
-    }
 }