Upgraded to .NET 10 (#1147)

app/TrimSmokeTest/JsonRoundTrips.cs

@@ -6,16 +6,32 @@ using AIStudio.Settings;
 using AIStudio.Settings.DataModel;
 using AIStudio.Tools;
 
+using Microsoft.AspNetCore.Components.Forms;
+
 namespace AIStudio.TrimSmokeTest;
 
 /// <summary>
 /// Writes and reads filled values of the roots which matter most, since some parts of a contract only come
 /// into play once there is a value, e.g., the factory which builds an immutable collection.
 /// </summary>
+/// <remarks>
+/// Blazor writes some state of its own as JSON, too: it puts it into the page and reads it again when the
+/// circuit starts. When that fails, the circuit closes at once, and the window of AI Studio stays empty.
+/// </remarks>
 public static class JsonRoundTrips
 {
     private const string TEXT_WITH_WEB_ADDRESS = "The details are on https://example.org/chosen.";
 
+    /// <summary>
+    /// The options with which Blazor writes and reads its state, as JsonSerializerOptionsProvider in ASP.NET Core sets them.
+    /// </summary>
+    private static readonly JsonSerializerOptions BLAZOR_STATE_OPTIONS = new()
+    {
+        PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
+        PropertyNameCaseInsensitive = true,
+        IncludeFields = true,
+    };
+
     /// <summary>
     /// Returns a description of every value which does not survive being written and read again.
     /// </summary>
@@ -44,6 +60,11 @@ public static class JsonRoundTrips
         AddLoss(chat, WorkspaceBehaviour.JSON_OPTIONS, failures);
         AddLoss(new Data(), SettingsManager.JSON_OPTIONS, failures);
         AddLoss(new VisualBriefingManifest { Name = "Trim smoke test", Restrictions = restrictions }, VisualBriefingJson.Persistence, failures);
+
+        //
+        // Since .NET 10, Blazor carries the antiforgery token from the page into the circuit:
+        //
+        AddLoss(new AntiforgeryRequestToken("Trim smoke test", "__RequestVerificationToken"), BLAZOR_STATE_OPTIONS, failures);
         return failures;
     }
 

app/TrimSmokeTest/TrimSmokeTest.csproj

@@ -7,7 +7,7 @@
     -->
     <PropertyGroup>
         <OutputType>Exe</OutputType>
-        <TargetFramework>net9.0</TargetFramework>
+        <TargetFramework>net10.0</TargetFramework>
         <RootNamespace>AIStudio.TrimSmokeTest</RootNamespace>
         <LangVersion>latest</LangVersion>
         <ImplicitUsings>enable</ImplicitUsings>