diff --git a/GameFrameX.Foundation.Extensions/IEnumerableExtensions.cs b/GameFrameX.Foundation.Extensions/IEnumerableExtensions.cs
index 2ed74a1..6736111 100644
--- a/GameFrameX.Foundation.Extensions/IEnumerableExtensions.cs
+++ b/GameFrameX.Foundation.Extensions/IEnumerableExtensions.cs
@@ -1283,26 +1283,65 @@ public static bool SequenceEqual<T1, T2>(this IEnumerable<T1> first, IEnumerable
 
         if (first is ICollection<T1> source1 && second is ICollection<T2> source2)
         {
-            if (source1.Count != source2.Count)
-            {
-                return false;
-            }
+            return EqualAsCollection(source1, source2, condition);
+        }
 
-            if (source1 is IList<T1> list1 && source2 is IList<T2> list2)
+        return EqualByEnumerator(first, second, condition);
+    }
+
+    /// <summary>
+    /// 当双方都已实现 <see cref="ICollection{T}"/> 时走集合快路径：长度不一致直接 <c>false</c>；只要一方同时实现 <see cref="IList{T}"/> 就以 <see cref="IList{T}"/> 索引方式逐元素比较，否则回退到枚举器比较。
+    /// </summary>
+    /// <remarks>
+    /// Compares two <see cref="ICollection{T}"/> with a custom condition.
+    /// Returns <c>false</c> immediately when the counts differ;
+    /// if both sides also implement <see cref="IList{T}"/> the indexed access path is used,
+    /// otherwise the enumerator fallback is used.
+    /// Splitting this branch out of <see cref="SequenceEqual{T1, T2}"/> keeps that method's cognitive complexity within Sonar S3776's 15.
+    /// </remarks>
+    /// <param name="first">第一个序列 / The first sequence</param>
+    /// <param name="second">第二个序列 / The second sequence</param>
+    /// <param name="condition">用于比较两个元素的条件 / The condition to compare two elements</param>
+    /// <returns>长度相等且所有对应元素满足条件时返回 <c>true</c> / Returns <c>true</c> if lengths match and all pairs satisfy <paramref name="condition"/></returns>
+    private static bool EqualAsCollection<T1, T2>(ICollection<T1> first, ICollection<T2> second, Func<T1, T2, bool> condition)
+    {
+        if (first.Count != second.Count)
+        {
+            return false;
+        }
+
+        if (first is IList<T1> list1 && second is IList<T2> list2)
+        {
+            var count = list1.Count;
+            for (var index = 0; index < count; ++index)
             {
-                var count = source1.Count;
-                for (var index = 0; index < count; ++index)
+                if (!condition(list1[index], list2[index]))
                 {
-                    if (!condition(list1[index], list2[index]))
-                    {
-                        return false;
-                    }
+                    return false;
                 }
-
-                return true;
             }
+
+            return true;
         }
 
+        return EqualByEnumerator(first, second, condition);
+    }
+
+    /// <summary>
+    /// 通过并行枚举两个 <see cref="IEnumerable{T}"/> 序列并以 <paramref name="condition"/> 逐元素比较，确认二者长度相等且每个对应位置的元素都满足条件。
+    /// </summary>
+    /// <remarks>
+    /// Compares two sequences element-by-element via parallel enumeration.
+    /// Used by <see cref="SequenceEqual{T1, T2}"/> when no <see cref="ICollection{T}"/> fast path is available,
+    /// and by the collection fast path when at least one side is not an <see cref="IList{T}"/>.
+    /// Splitting this branch out of <see cref="SequenceEqual{T1, T2}"/> keeps that method's cognitive complexity within Sonar S3776's 15.
+    /// </remarks>
+    /// <param name="first">第一个序列 / The first sequence</param>
+    /// <param name="second">第二个序列 / The second sequence</param>
+    /// <param name="condition">用于比较两个元素的条件 / The condition to compare two elements</param>
+    /// <returns>长度相等且所有对应元素满足条件时返回 <c>true</c> / Returns <c>true</c> if lengths match and all pairs satisfy <paramref name="condition"/></returns>
+    private static bool EqualByEnumerator<T1, T2>(IEnumerable<T1> first, IEnumerable<T2> second, Func<T1, T2, bool> condition)
+    {
         using var enumerator1 = first.GetEnumerator();
         using var enumerator2 = second.GetEnumerator();
         while (enumerator1.MoveNext())
diff --git a/GameFrameX.Foundation.Tests/Extensions/IEnumerableExtensionsTests.cs b/GameFrameX.Foundation.Tests/Extensions/IEnumerableExtensionsTests.cs
index 5af1fb2..6bff2cc 100644
--- a/GameFrameX.Foundation.Tests/Extensions/IEnumerableExtensionsTests.cs
+++ b/GameFrameX.Foundation.Tests/Extensions/IEnumerableExtensionsTests.cs
@@ -361,6 +361,68 @@ public void SequenceEqual_DifferentTypes_ShouldReturnTrue()
         Assert.True(result);
     }
 
+
+    [Fact]
+    public void SequenceEqual_ICollectionLengthMismatch_ShouldReturnFalse()
+    {
+        // Arrange: both sides are IList<T> (also ICollection<T>) with differing lengths.
+        var first = new[] { 1, 2, 3 };
+        var second = new[] { 1, 2 };
+
+        // Act
+        var result = first.SequenceEqual(second, (x, y) => x == y);
+
+        // Assert
+        Assert.False(result);
+    }
+
+    [Fact]
+    public void SequenceEqual_PredicateFailure_ShouldReturnFalse()
+    {
+        // Arrange: identical lengths but predicate rejects the second element.
+        var first = new[] { 1, 2, 3 };
+        var second = new[] { 1, 9, 3 };
+
+        // Act
+        var result = first.SequenceEqual(second, (x, y) => x == y);
+
+        // Assert
+        Assert.False(result);
+    }
+
+    [Fact]
+    public void SequenceEqual_CollectionNotList_ShouldReturnTrue()
+    {
+        // Arrange: LinkedList<T> implements ICollection<T> but not IList<T>, so the
+        // helper must fall back to the enumerator path while still returning true.
+        var first = new LinkedList<int>(new[] { 1, 2, 3 });
+        var second = new LinkedList<int>(new[] { 1, 2, 3 });
+
+        // Act
+        var result = first.SequenceEqual(second, (x, y) => x == y);
+
+        // Assert
+        Assert.True(result);
+    }
+
+    [Fact]
+    public void SequenceEqual_LazyEnumerable_ShouldReturnTrue()
+    {
+        // Arrange: pure IEnumerable<T> with no collection optimisation available.
+        static IEnumerable<int> Range(int from, int count)
+        {
+            for (var i = 0; i < count; i++)
+            {
+                yield return from + i;
+            }
+        }
+
+        // Act
+        var result = Range(10, 3).SequenceEqual(Range(10, 3), (x, y) => x == y);
+
+        // Assert
+        Assert.True(result);
+    }
     #endregion
 
     #region CompareChanges Tests