From a565f9ff5827f255babd839e7a4d539a6f4697ae Mon Sep 17 00:00:00 2001
From: mnltejaswini <mnl.tejaswini@gmail.com>
Date: Fri, 15 Apr 2016 13:29:49 -0700
Subject: [PATCH] [Perf] Reduce DefaultTagHelperContent allocations in
 LinkTagHelper and ScriptTagHelper Fixes #4468

---
 src/Microsoft.AspNetCore.Mvc.TagHelpers/LinkTagHelper.cs   | 6 +++---
 src/Microsoft.AspNetCore.Mvc.TagHelpers/ScriptTagHelper.cs | 7 +++----
 2 files changed, 6 insertions(+), 7 deletions(-)

diff --git a/src/Microsoft.AspNetCore.Mvc.TagHelpers/LinkTagHelper.cs b/src/Microsoft.AspNetCore.Mvc.TagHelpers/LinkTagHelper.cs
index b344975e83..b73162131c 100644
--- a/src/Microsoft.AspNetCore.Mvc.TagHelpers/LinkTagHelper.cs
+++ b/src/Microsoft.AspNetCore.Mvc.TagHelpers/LinkTagHelper.cs
@@ -256,7 +256,9 @@ namespace Microsoft.AspNetCore.Mvc.TagHelpers
                 }
             }
 
-            var builder = new DefaultTagHelperContent();
+            var builder = output.PostElement;
+            builder.Clear();
+
             if (mode == Mode.GlobbedHref || mode == Mode.Fallback && !string.IsNullOrEmpty(HrefInclude))
             {
                 BuildGlobbedLinkTags(output.Attributes, builder);
@@ -278,8 +280,6 @@ namespace Microsoft.AspNetCore.Mvc.TagHelpers
 
                 BuildFallbackBlock(builder);
             }
-
-            output.PostElement.SetHtmlContent(builder);
         }
 
         private void BuildGlobbedLinkTags(TagHelperAttributeList attributes, TagHelperContent builder)
diff --git a/src/Microsoft.AspNetCore.Mvc.TagHelpers/ScriptTagHelper.cs b/src/Microsoft.AspNetCore.Mvc.TagHelpers/ScriptTagHelper.cs
index 3f4c46c75a..ff74569057 100644
--- a/src/Microsoft.AspNetCore.Mvc.TagHelpers/ScriptTagHelper.cs
+++ b/src/Microsoft.AspNetCore.Mvc.TagHelpers/ScriptTagHelper.cs
@@ -239,7 +239,8 @@ namespace Microsoft.AspNetCore.Mvc.TagHelpers
                 }
             }
 
-            var builder = new DefaultTagHelperContent();
+            var builder = output.PostElement;
+            builder.Clear();
 
             if (mode == Mode.GlobbedSrc || mode == Mode.Fallback && !string.IsNullOrEmpty(SrcInclude))
             {
@@ -262,8 +263,6 @@ namespace Microsoft.AspNetCore.Mvc.TagHelpers
 
                 BuildFallbackBlock(output.Attributes, builder);
             }
-
-            output.PostElement.SetHtmlContent(builder);
         }
 
         private void BuildGlobbedScriptTags(
@@ -289,7 +288,7 @@ namespace Microsoft.AspNetCore.Mvc.TagHelpers
             }
         }
 
-        private void BuildFallbackBlock(TagHelperAttributeList attributes, DefaultTagHelperContent builder)
+        private void BuildFallbackBlock(TagHelperAttributeList attributes, TagHelperContent builder)
         {
             EnsureGlobbingUrlBuilder();