Make ProjectEngineBuilderAction public and invoke it when compiling template.

RazorEngineCore.Tests/TestCompileAndRun.cs

@@ -908,6 +908,27 @@ public void TestCompileAndRun_IncludeDebuggingForTypedAnonymous_EnabledDebugging
             Assert.AreEqual("<h1>Hello Alex</h1>", actual);
         }
 
+        [TestMethod]
+        public void TestCompileAndRun_ProjectEngineBuilderAction_IsInvoked()
+        {
+            var builderActionIsInvoked = false; 
+            RazorEngine razorEngine = new RazorEngine();
+            IRazorEngineCompiledTemplate template = razorEngine.Compile("<h1>Hello @Model.Name</h1>", builder =>
+            {
+                builder.IncludeDebuggingInfo();
+                builder.Options.ProjectEngineBuilderAction = (x) => builderActionIsInvoked = true;
+            });
+
+            template.EnableDebugging();
+
+            string actual = template.Run(new
+            {
+                Name = "Alex"
+            });
+
+            Assert.IsTrue(builderActionIsInvoked);
+        }
+
         [TestMethod]
         public void TestCompileAndRun_Typed_EnabledDebuggingThrowsException()
         {

RazorEngineCore/RazorEngine.cs

@@ -67,6 +67,7 @@ protected virtual RazorEngineCompiledTemplateMeta CreateAndCompileToStream(strin
                 (builder) =>
                 {
                     builder.SetNamespace(options.TemplateNamespace);
+                    options.ProjectEngineBuilderAction?.Invoke(builder);
                 });
 
             RazorSourceDocument document = RazorSourceDocument.Create(templateSource, fileName);

RazorEngineCore/RazorEngineCompilationOptions.cs

@@ -3,6 +3,7 @@
 using System.Runtime.InteropServices;
 using Microsoft.CodeAnalysis;
 using System;
+using Microsoft.AspNetCore.Razor.Language;
 
 namespace RazorEngineCore
 {
@@ -22,6 +23,7 @@ public class RazorEngineCompilationOptions
             "System.Collections",
             "System.Collections.Generic"
         };
+        public Action<RazorProjectEngineBuilder> ProjectEngineBuilderAction { get; set; }
 
         public RazorEngineCompilationOptions()
         {