From 78a19c07e90b1a086c28e455cef16099ea11bdca Mon Sep 17 00:00:00 2001
From: Steve Sanderson <SteveSandersonMS@users.noreply.github.com>
Date: Tue, 20 Feb 2018 14:57:31 +0000
Subject: [PATCH] In RazorCompiler, allow HTML comments

---
 samples/StandaloneApp/App.cshtml                    |  8 +++++++-
 .../BlazorIntermediateNodeWriter.cs                 |  3 +++
 .../RazorCompilerTest.cs                            | 13 +++++++++++++
 3 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/samples/StandaloneApp/App.cshtml b/samples/StandaloneApp/App.cshtml
index 00e26124af..e7bed1320d 100644
--- a/samples/StandaloneApp/App.cshtml
+++ b/samples/StandaloneApp/App.cshtml
@@ -1,2 +1,8 @@
 @using Microsoft.AspNetCore.Blazor.Browser.Routing
-<c:BrowserRouter AppAssembly=@(typeof(StandaloneApp.Program).Assembly) PagesNamespace=@("StandaloneApp.Pages") />
+<!--
+    Configuring this stuff here is temporary. Later we'll move the app config
+    into Program.cs, and it won't be necessary to specify AppAssembly.
+-->
+<c:BrowserRouter
+    AppAssembly=@(typeof(StandaloneApp.Program).Assembly)
+    PagesNamespace=@("StandaloneApp.Pages") />
diff --git a/src/Microsoft.AspNetCore.Blazor.Razor.Extensions/BlazorIntermediateNodeWriter.cs b/src/Microsoft.AspNetCore.Blazor.Razor.Extensions/BlazorIntermediateNodeWriter.cs
index 9621a56aa8..3901555366 100644
--- a/src/Microsoft.AspNetCore.Blazor.Razor.Extensions/BlazorIntermediateNodeWriter.cs
+++ b/src/Microsoft.AspNetCore.Blazor.Razor.Extensions/BlazorIntermediateNodeWriter.cs
@@ -285,6 +285,9 @@ namespace Microsoft.AspNetCore.Blazor.Razor
                             break;
                         }
 
+                    case HtmlTokenType.Comment:
+                        break;
+
                     default:
                         throw new InvalidCastException($"Unsupported token type: {nextToken.Type.ToString()}");
                 }
diff --git a/test/Microsoft.AspNetCore.Blazor.Build.Test/RazorCompilerTest.cs b/test/Microsoft.AspNetCore.Blazor.Build.Test/RazorCompilerTest.cs
index e02ec49362..cb825b3307 100644
--- a/test/Microsoft.AspNetCore.Blazor.Build.Test/RazorCompilerTest.cs
+++ b/test/Microsoft.AspNetCore.Blazor.Build.Test/RazorCompilerTest.cs
@@ -187,6 +187,19 @@ namespace Microsoft.AspNetCore.Blazor.Build.Test
                 frame => AssertFrame.Element(frame, "img", 1, 1));
         }
 
+        [Fact]
+        public void SupportsComments()
+        {
+            // Arrange/Act
+            var component = CompileToComponent("Start<!-- My comment -->End");
+            var frames = GetRenderTree(component);
+
+            // Assert
+            Assert.Collection(frames,
+                frame => AssertFrame.Text(frame, "Start", 0),
+                frame => AssertFrame.Text(frame, "End", 1));
+        }
+
         [Fact]
         public void SupportsAttributesWithLiteralValues()
         {