Merge branch 'feature/Runtime-View-Compilation' into develop

When we migrated to .NET Core 3.0, we lost the ability to have views dynamically compiled at runtime. This is preferable in the production environment, where we don't expect the views to change frequently, as it means that precompiled views are loaded, which is much faster. For development, though, it adds a lot of overhead as it means we need to stop running the debugger, make a change, build the assembly, and then rerun the debugger. This can be mitigated by installing Microsoft's `RuntimeCompilation` package. In addition, this offers support for Razor Class Libraries with the aid of the `FileProviders` option, thus allowing us to change views in the OnTopic Editor and have them (almost) immediately available within the browser window being used for debugging.

Author: JeremyCaney

OnTopic.Editor.AspNetCore.Host/OnTopic.Editor.AspNetCore.Host.csproj

@@ -12,6 +12,7 @@
     <PackageReference Include="OnTopic.AspNetCore.Mvc" Version="4.3.0" />
     <PackageReference Include="OnTopic.Data.Caching" Version="4.3.0" />
     <PackageReference Include="OnTopic.Data.Sql" Version="4.3.0" />
+    <PackageReference Include="Microsoft.AspNetCore.Mvc.Razor.RuntimeCompilation" Version="3.1.7" />
   </ItemGroup>
 
   <ItemGroup>

OnTopic.Editor.AspNetCore.Host/Startup.cs

@@ -3,13 +3,16 @@
 | Client        Ignia, LLC
 | Project       Sample OnTopic Site
 \=============================================================================================================================*/
+using System.IO;
 using Microsoft.AspNetCore.Builder;
 using Microsoft.AspNetCore.Hosting;
 using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.Mvc.Controllers;
+using Microsoft.AspNetCore.Mvc.Razor.RuntimeCompilation;
 using Microsoft.AspNetCore.Mvc.ViewComponents;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.FileProviders;
 using Microsoft.Extensions.Hosting;
 using OnTopic.AspNetCore.Mvc;
 using OnTopic.Editor.AspNetCore;
@@ -74,14 +77,25 @@ public void ConfigureServices(IServiceCollection services) {
       /*------------------------------------------------------------------------------------------------------------------------
       | Configure: MVC
       \-----------------------------------------------------------------------------------------------------------------------*/
-      services.AddControllersWithViews()
+      var mvcBuilder = services.AddControllersWithViews()
 
         //Add OnTopic support
         .AddTopicSupport()
 
         //Add OnTopic editor support
         .AddTopicEditor();
 
+      /*------------------------------------------------------------------------------------------------------------------------
+      | Configure: Runtime View Compilation
+      \-----------------------------------------------------------------------------------------------------------------------*/
+      if (HostingEnvironment.IsDevelopment()) {
+        mvcBuilder.AddRazorRuntimeCompilation();
+        services.Configure<MvcRazorRuntimeCompilationOptions>(options => {
+          var libraryPath = Path.GetFullPath(Path.Combine(HostingEnvironment.ContentRootPath, "..", "OnTopic.Editor.AspNetCore"));
+          options.FileProviders.Add(new PhysicalFileProvider(libraryPath));
+        });
+      }
+
       /*------------------------------------------------------------------------------------------------------------------------
       | Configure: Watch Razor Class Library (RCLs) views
       >-------------------------------------------------------------------------------------------------------------------------