diff --git a/AyCode.Core.Serializers.SourceGenerator/AcBinarySourceGenerator.cs b/AyCode.Core.Serializers.SourceGenerator/AcBinarySourceGenerator.cs
index 719df13..38ea653 100644
--- a/AyCode.Core.Serializers.SourceGenerator/AcBinarySourceGenerator.cs
+++ b/AyCode.Core.Serializers.SourceGenerator/AcBinarySourceGenerator.cs
@@ -158,6 +158,15 @@ public class AcBinarySourceGenerator : IIncrementalGenerator
                 sb.AppendLine($"{i}AcBinarySerializer.WriteStringGenerated({a}, context);");
                 break;
             case PropertyTypeKind.Complex:
+                // Complex object: use WriteObjectGenerated (skips type dispatch in WriteValueNonPrimitive)
+                if (p.IsNullable)
+                {
+                    sb.AppendLine($"{i}if ({a} == null) context.WriteByte(BinaryTypeCode.PropertySkip);");
+                    sb.AppendLine($"{i}else AcBinarySerializer.WriteObjectGenerated({a}, {a}.GetType(), context, depth);");
+                }
+                else
+                    sb.AppendLine($"{i}AcBinarySerializer.WriteObjectGenerated({a}, {a}.GetType(), context, depth);");
+                break;
             case PropertyTypeKind.Collection:
                 if (p.IsNullable)
                 {
diff --git a/AyCode.Core/Serializers/Binaries/AcBinarySerializer.cs b/AyCode.Core/Serializers/Binaries/AcBinarySerializer.cs
index 807a3e5..7a20084 100644
--- a/AyCode.Core/Serializers/Binaries/AcBinarySerializer.cs
+++ b/AyCode.Core/Serializers/Binaries/AcBinarySerializer.cs
@@ -499,6 +499,26 @@ public static partial class AcBinarySerializer
         WriteString(value, context);
     }
 
+    /// <summary>
+    /// Bridge for generated writers: writes a non-null complex OBJECT directly.
+    /// Skips WriteValueNonPrimitive type dispatch (is byte[]?, is IDictionary?, is IEnumerable?, GetWrapper)
+    /// because the SrcGen knows at compile-time that the property is a complex object.
+    /// Uses pre-resolved wrapper type to avoid GetWrapper dictionary lookup.
+    /// </summary>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    internal static void WriteObjectGenerated<TOutput>(object value, Type type, BinarySerializationContext<TOutput> context, int depth)
+        where TOutput : struct, IBinaryOutputBase
+    {
+        if (depth > context.MaxDepth)
+        {
+            context.WriteByte(BinaryTypeCode.Null);
+            return;
+        }
+
+        var wrapper = context.GetWrapper(type);
+        WriteObject(value, wrapper, context, depth, isNested: depth > 0);
+    }
+
     #endregion
 
     #region Value Writing