From 03de74a49450f882990b9145637574bb9b192052 Mon Sep 17 00:00:00 2001
From: Chris Cameron <chris.cameron@wedoresi.com>
Date: Tue, 30 Oct 2018 13:47:08 -0400
Subject: [PATCH] perf: Potential performance improvement when comparing
 enumerables

---
 ICD.Common.Utils/Extensions/EnumerableExtensions.cs | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/ICD.Common.Utils/Extensions/EnumerableExtensions.cs b/ICD.Common.Utils/Extensions/EnumerableExtensions.cs
index 1d1269b..edac918 100644
--- a/ICD.Common.Utils/Extensions/EnumerableExtensions.cs
+++ b/ICD.Common.Utils/Extensions/EnumerableExtensions.cs
@@ -227,6 +227,12 @@ namespace ICD.Common.Utils.Extensions
 			if (comparer == null)
 				throw new ArgumentNullException("comparer");
 
+			// Simple count check
+			ICollection<T> a = extends as ICollection<T>;
+			ICollection<T> b = other as ICollection<T>;
+			if (a != null && b != null && a.Count != b.Count)
+				return false;
+
 			using (IEnumerator<T> firstPos = extends.GetEnumerator())
 			{
 				using (IEnumerator<T> secondPos = other.GetEnumerator())
@@ -285,6 +291,12 @@ namespace ICD.Common.Utils.Extensions
 			if (comparer == null)
 				throw new ArgumentNullException("comparer");
 
+			// Simple count check
+			ICollection<T> a = extends as ICollection<T>;
+			ICollection<T> b = other as ICollection<T>;
+			if (a != null && b != null && a.Count != b.Count)
+				return false;
+
 			Dictionary<T, int> count = new Dictionary<T, int>(comparer);
 
 			foreach (T item in extends)