Enable lazy DI registration

Fixes dnnsoftware#5646

DNN Platform/DotNetNuke.DependencyInjection/DotNetNuke.DependencyInjection.csproj

@@ -6,6 +6,7 @@
     <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
     <RootDirectory>$(MSBuildProjectDirectory)\..\..</RootDirectory>
     <DocumentationFile>bin/$(Configuration)/$(TargetFramework)/DotNetNuke.DependencyInjection.xml</DocumentationFile>
+    <LangVersion>latest</LangVersion>
   </PropertyGroup>
 
   <PropertyGroup>

DNN Platform/DotNetNuke.DependencyInjection/LazyWrapper.cs

@@ -0,0 +1,18 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information
+namespace DotNetNuke.DependencyInjection;
+using System;
+using Microsoft.Extensions.DependencyInjection;
+
+/// <summary>A <see cref="Lazy{T}"/> wrapper which allows requesting <see cref="Lazy{T}"/> via dependency injection and delaying instantiation.</summary>
+/// <typeparam name="T">The type of service to conditionally instantiate.</typeparam>
+public class LazyWrapper<T> : Lazy<T>
+{
+    /// <summary>Initializes a new instance of the <see cref="LazyWrapper{T}"/> class.</summary>
+    /// <param name="serviceProvider">The DI container.</param>
+    public LazyWrapper(IServiceProvider serviceProvider)
+        : base(serviceProvider.GetService<T>)
+    {
+    }
+}

DNN Platform/Library/Startup.cs

@@ -3,6 +3,7 @@
 // See the LICENSE file in the project root for more information
 namespace DotNetNuke
 {
+    using System;
     using DotNetNuke.Abstractions;
     using DotNetNuke.Abstractions.Application;
     using DotNetNuke.Abstractions.Logging;
@@ -26,6 +27,8 @@ public class Startup : IDnnStartup
         /// <inheritdoc />
         public void ConfigureServices(IServiceCollection services)
         {
+            services.AddTransient(typeof(Lazy<>), typeof(LazyWrapper<>));
+
             services.AddSingleton<WebFormsModuleControlFactory>();
             services.AddSingleton<Html5ModuleControlFactory>();
             services.AddSingleton<ReflectedModuleControlFactory>();