Fix bug using injectable properties from ExecuteSectionAsync

samples/RazorSlices.Samples.WebApp/Slices/Lorem/LoremInjectableProperties.cshtml

@@ -17,7 +17,7 @@
     {
         if (name == "lorem-header")
         {
-            <p class="text-info">This page renders lorem ipsum content from a service that's injected vie the <code>@@inject</code> directive.</p>
+            <p class="text-info">This page renders lorem ipsum content from a service (@LoremService.GetType().Name) that's injected via the <code>@@inject</code> directive.</p>
         }
 
         return Task.CompletedTask;

src/RazorSlices/RazorLayoutSlice.cs

@@ -1,4 +1,5 @@
-using Microsoft.AspNetCore.Html;
+using System.Diagnostics;
+using Microsoft.AspNetCore.Html;
 
 namespace RazorSlices;
 
@@ -37,7 +38,10 @@ protected ValueTask<HtmlString> RenderSectionAsync(string sectionName)
 
         if (ContentSlice is not null)
         {
+            Debug.WriteLine($"Rendering section '{sectionName}' on child slice of type '{ContentSlice.GetType().Name}' from layout slice of type '{GetType().Name}'");
+
             var renderTask = ContentSlice.ExecuteSectionAsync(sectionName);
+
             if (!renderTask.HandleSynchronousCompletion())
             {
                 return AwaitRenderTask(renderTask);

src/RazorSlices/RazorLayoutSliceOfTModel.cs

@@ -1,4 +1,5 @@
-using Microsoft.AspNetCore.Html;
+using System.Diagnostics;
+using Microsoft.AspNetCore.Html;
 
 namespace RazorSlices;
 
@@ -41,7 +42,10 @@ protected ValueTask<HtmlString> RenderSectionAsync(string sectionName)
 
         if (ContentSlice is not null)
         {
+            Debug.WriteLine($"Rendering section '{sectionName}' on child slice of type '{ContentSlice.GetType().Name}' from layout slice of type '{GetType().Name}'");
+
             var renderTask = ContentSlice.ExecuteSectionAsync(sectionName);
+
             if (!renderTask.HandleSynchronousCompletion())
             {
                 return AwaitRenderTask(renderTask);

src/RazorSlices/RazorSlice.cs

@@ -26,6 +26,7 @@ public abstract partial class RazorSlice : IDisposable
     private HtmlEncoder _htmlEncoder = HtmlEncoder.Default;
     private PipeWriter? _pipeWriter;
     private TextWriter? _textWriter;
+    private bool _initialized;
     private bool _disposed;
 
     /// <summary>
@@ -72,10 +73,7 @@ public IServiceProvider? ServiceProvider
 
     internal Task ExecuteAsyncImpl()
     {
-        if (Initialize is not null)
-        {
-            Initialize(this, _serviceProvider, HttpContext);
-        }
+        EnsureInitialized();
 
         return ExecuteAsync();
     }
@@ -248,6 +246,7 @@ private ValueTask RenderViaLayout<TWriter>(Func<RazorSlice, TWriter, HtmlEncoder
 
         if (layoutSlice is IRazorLayoutSlice razorLayoutSlice and RazorSlice)
         {
+            EnsureInitialized();
             razorLayoutSlice.ContentSlice = this;
             CopySliceState(this, (RazorSlice)razorLayoutSlice);
 
@@ -271,6 +270,16 @@ internal static async ValueTask<HtmlString> AwaitRenderTask(Task renderTask)
         return HtmlString.Empty;
     }
 
+    private void EnsureInitialized()
+    {
+        if (!_initialized && Initialize is not null)
+        {
+            Debug.WriteLine($"Initializing slice of type '{GetType().Name}'. {nameof(_serviceProvider)} is currently {(_serviceProvider is null ? "null" : "not null")}.");
+            Initialize(this, _serviceProvider, HttpContext);
+            _initialized = true;
+        }
+    }
+
     private ValueTask<FlushResult> AutoFlush()
     {
         Debug.Assert(_pipeWriter is null || _pipeWriter.CanGetUnflushedBytes, "PipeWriter must support unflushed bytes to auto-flush.");