From 43b1176f39bb70b085ea939bd902218047fa7051 Mon Sep 17 00:00:00 2001
From: Dustin Campbell <dustin@teamcampbell.org>
Date: Fri, 14 Apr 2023 15:19:55 -0700
Subject: [PATCH] Convert to ImmutableArray<T> to avoid extra LINQ evaluation

---
 .../src/DefaultTagHelperDescriptorFactory.cs       | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/src/Compiler/Microsoft.CodeAnalysis.Razor/src/DefaultTagHelperDescriptorFactory.cs b/src/Compiler/Microsoft.CodeAnalysis.Razor/src/DefaultTagHelperDescriptorFactory.cs
index 4df495a374..fa5d160e98 100644
--- a/src/Compiler/Microsoft.CodeAnalysis.Razor/src/DefaultTagHelperDescriptorFactory.cs
+++ b/src/Compiler/Microsoft.CodeAnalysis.Razor/src/DefaultTagHelperDescriptorFactory.cs
@@ -64,9 +64,17 @@ internal class DefaultTagHelperDescriptorFactory
 
     private static void AddTagMatchingRules(INamedTypeSymbol type, TagHelperDescriptorBuilder descriptorBuilder)
     {
-        var targetElementAttributes = type
-            .GetAttributes()
-            .Where(static attribute => attribute.AttributeClass.HasFullName(TagHelperTypes.HtmlTargetElementAttribute));
+        using var builder = new PooledArrayBuilder<AttributeData>();
+
+        foreach (var attribute in type.GetAttributes())
+        {
+            if (attribute.AttributeClass.HasFullName(TagHelperTypes.HtmlTargetElementAttribute))
+            {
+                builder.Add(attribute);
+            }
+        }
+
+        var targetElementAttributes = builder.ToImmutable();
 
         // If there isn't an attribute specifying the tag name derive it from the name
         if (!targetElementAttributes.Any())