stop

src/TerribleDev.Blog.Web/Factories/BlogCacheFactory.cs

@@ -15,16 +15,9 @@ namespace TerribleDev.Blog.Web.Factories
             .Aggregate(
              ImmutableDictionary.Create<string, ImmutableList<IPost>>(),
             (accum, item) => {
-                foreach(var tag in item.tags.Select(i => i.ToLower()))
+                foreach(var tag in item.tags.Where(i => !string.IsNullOrWhiteSpace(i)).Select(i => i.ToLower()))
                 {
-                    if(accum.TryGetValue(tag, out var list))
+                    accum = accum.TryGetValue(tag, out var list) ? accum.SetItem(tag, list.Add(item)) : accum.Add(tag, ImmutableList.Create(item));
-                    {
-                        accum = accum.SetItem(tag, list.Add(item));
-                    }
-                    else
-                    {
-                        accum = accum.Add(tag, ImmutableList.Create<IPost>(item));
-                    }
                 }
                 return accum;
             }).ToImmutableSortedDictionary();
@@ -46,6 +39,7 @@ namespace TerribleDev.Blog.Web.Factories
                 return accum.SetItem(highestPage, current.Add(item));
             }).ToImmutableDictionary();
             var syndicationPosts = posts.Select(i => i.ToSyndicationItem()).ToImmutableList();
+            var postsToPosition = posts.Select((item, index) => (item, index)).ToImmutableDictionary(i => i.item, i => i.index);
             return new PostCache()
             {
                 PostsAsLists = posts,

src/TerribleDev.Blog.Web/Models/Post.cs

@@ -18,5 +18,7 @@ namespace TerribleDev.Blog.Web.Models
         public string SummaryPlainShort { get; set; }
         public IList<string> tags { get; set; }
         public IList<string> Images { get; set;}
+
     }
+
 }

src/TerribleDev.Blog.Web/Models/PostCache.cs

@@ -10,6 +10,7 @@ namespace TerribleDev.Blog.Web.Models
         public ImmutableDictionary<string, IPost> UrlToPost { get; set; }
         public  ImmutableDictionary<int, ImmutableList<IPost>> PostsByPage { get; set; }
         public ImmutableList<SyndicationItem> PostsAsSyndication { get; set; }
-        
+        public ImmutableDictionary<IPost, int> PostToPosition { get; set; }
+
     }
 }

src/TerribleDev.Blog.Web/TerribleDev.Blog.Web.csproj

@@ -7,6 +7,7 @@
     <UserSecretsId>9a1f51b6-f4d9-4df7-a0af-e345176e9927</UserSecretsId>
     <ApplicationInsightsResourceId>/subscriptions/088a81c7-d703-41c9-a1d0-476bce11df60/resourcegroups/WebResourceGroup/providers/microsoft.insights/components/tparnellblognew</ApplicationInsightsResourceId>
     <ApplicationInsightsAnnotationResourceId>/subscriptions/088a81c7-d703-41c9-a1d0-476bce11df60/resourcegroups/WebResourceGroup/providers/microsoft.insights/components/tparnellblognew</ApplicationInsightsAnnotationResourceId>
+    <LangVersion>7.3</LangVersion>
   </PropertyGroup>
 
   <ItemGroup>