Add IComponentActivator

src/Components/Components/src/ComponentActivator.cs

@@ -0,0 +1,19 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System;
+
+namespace Microsoft.AspNetCore.Components
+{
+    /// <summary>
+    /// Default implementation of component activator.
+    /// </summary>
+    public class ComponentActivator : IComponentActivator
+    {
+        /// <inheritdoc />
+        public object CreateInstance(Type componentType)
+        {
+            return Activator.CreateInstance( componentType );
+        }
+    }
+}

src/Components/Components/src/ComponentFactory.cs

@@ -6,6 +6,7 @@
 using System.Linq;
 using System.Reflection;
 using Microsoft.AspNetCore.Components.Reflection;
+using Microsoft.Extensions.DependencyInjection;
 
 namespace Microsoft.AspNetCore.Components
 {
@@ -25,7 +26,12 @@ private readonly ConcurrentDictionary<Type, Action<IServiceProvider, IComponent>
 
         public IComponent InstantiateComponent(IServiceProvider serviceProvider, Type componentType)
         {
-            var instance = Activator.CreateInstance(componentType);
+            var activator = serviceProvider.GetService<IComponentActivator>();
+
+            var instance = activator != null
+                ? activator.CreateInstance(componentType)
+                : Activator.CreateInstance(componentType);
+
             if (!(instance is IComponent component))
             {
                 throw new ArgumentException($"The type {componentType.FullName} does not implement {nameof(IComponent)}.", nameof(componentType));

src/Components/Components/src/IComponentActivator.cs

@@ -0,0 +1,20 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System;
+
+namespace Microsoft.AspNetCore.Components
+{
+    /// <summary>
+    /// Represents an activator that can be used to instantiate components.
+    /// </summary>
+    public interface IComponentActivator
+    {
+        /// <summary>
+        /// Creates an component of the specified type using that type's default constructor.
+        /// </summary>
+        /// <param name="componentType">The type of component to create.</param>
+        /// <returns>A reference to the newly created component.</returns>
+        object CreateInstance(Type componentType);
+    }
+}

src/Components/Server/src/DependencyInjection/ComponentServiceCollectionExtensions.cs

@@ -74,6 +74,7 @@ public static IServerSideBlazorBuilder AddServerSideBlazor(this IServiceCollecti
             services.AddScoped<IJSRuntime, RemoteJSRuntime>();
             services.AddScoped<INavigationInterception, RemoteNavigationInterception>();
             services.AddScoped<AuthenticationStateProvider, ServerAuthenticationStateProvider>();
+            services.AddScoped<IComponentActivator, ComponentActivator>();
 
             services.TryAddEnumerable(ServiceDescriptor.Singleton<IConfigureOptions<CircuitOptions>, CircuitOptionsJSInteropDetailedErrorsConfiguration>());
 

src/Mvc/Mvc.ViewFeatures/src/DependencyInjection/MvcViewFeaturesMvcCoreBuilderExtensions.cs

@@ -212,6 +212,7 @@ internal static void AddViewServices(IServiceCollection services)
             services.TryAddScoped<NavigationManager, HttpNavigationManager>();
             services.TryAddScoped<IJSRuntime, UnsupportedJavaScriptRuntime>();
             services.TryAddScoped<INavigationInterception, UnsupportedNavigationInterception>();
+            services.TryAddScoped<IComponentActivator, ComponentActivator>();
 
             services.TryAddTransient<ControllerSaveTempDataPropertyFilter>();