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perf: Potential performance improvement when comparing enumerables

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This commit is contained in:
Chris Cameron
2018-10-30 13:47:08 -04:00
parent 6eacc21e45
commit 03de74a494
1 changed files with 12 additions and 0 deletions
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12
ICD.Common.Utils/Extensions/EnumerableExtensions.cs
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@@ -227,6 +227,12 @@ namespace ICD.Common.Utils.Extensions
if (comparer == null) if (comparer == null)
throw new ArgumentNullException("comparer"); 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> firstPos = extends.GetEnumerator())
{ {
using (IEnumerator<T> secondPos = other.GetEnumerator()) using (IEnumerator<T> secondPos = other.GetEnumerator())
@@ -285,6 +291,12 @@ namespace ICD.Common.Utils.Extensions
if (comparer == null) if (comparer == null)
throw new ArgumentNullException("comparer"); 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); Dictionary<T, int> count = new Dictionary<T, int>(comparer);
foreach (T item in extends) foreach (T item in extends)