Avoid checking the shared cache on a per-request basis to resolve the type for existing persistent service registrations

Author: javiercn

src/Components/Components/src/PersistentState/IPersistentServiceRegistration.cs

@@ -10,4 +10,6 @@ internal interface IPersistentServiceRegistration
     public string FullTypeName { get; }
 
     public IComponentRenderMode? GetRenderModeOrDefault();
+
+    public Type? GetResolvedTypeOrNull() => null;
 }

src/Components/Components/src/PersistentState/PersistentServiceRegistration.cs

@@ -13,5 +13,7 @@ internal sealed class PersistentServiceRegistration<TService>(IComponentRenderMo
 
     public IComponentRenderMode? GetRenderModeOrDefault() => componentRenderMode;
 
+    public Type? GetResolvedTypeOrNull() => typeof(TService);
+
     private string GetDebuggerDisplay() => $"{Assembly}::{FullTypeName}";
 }

src/Components/Components/src/PersistentState/PersistentServicesRegistry.cs

@@ -50,7 +50,7 @@ internal void RegisterForPersistence(PersistentComponentState state)
         for (var i = 0; i < _registrations.Length; i++)
         {
             var registration = _registrations[i];
-            var type = ResolveType(registration.Assembly, registration.FullTypeName);
+            var type = ResolveType(registration);
             if (type == null)
             {
                 continue;
@@ -112,7 +112,7 @@ private void RestoreRegistrationsIfAvailable(PersistentComponentState state)
     {
         foreach (var registration in _registrations)
         {
-            var type = ResolveType(registration.Assembly, registration.FullTypeName);
+            var type = ResolveType(registration);
             if (type == null)
             {
                 continue;
@@ -142,8 +142,16 @@ private static void RestoreInstanceState(object instance, Type type, PersistentC
 
     private static IPersistentServiceRegistration[] ResolveRegistrations(IEnumerable<IPersistentServiceRegistration> registrations) => [.. registrations.DistinctBy(r => (r.Assembly, r.FullTypeName)).OrderBy(r => r.Assembly).ThenBy(r => r.FullTypeName)];
 
-    private static Type? ResolveType(string assembly, string fullTypeName) =>
-        _persistentServiceTypeCache.GetRootType(assembly, fullTypeName);
+    private static Type? ResolveType(IPersistentServiceRegistration registration)
+    {
+        if(registration.GetResolvedTypeOrNull() is Type type)
+        {
+            return type;
+        }
+        var assembly = registration.Assembly;
+        var fullTypeName = registration.FullTypeName;
+        return _persistentServiceTypeCache.GetRootType(assembly, fullTypeName);
+    }
 
     private sealed class PropertiesAccessor
     {