Add _AsValue for blittable struct properties

src/ZeroSerializerGenerator.cs

@@ -1316,15 +1316,7 @@ var propertyReturnType
                     "propertyDataOffset");
                 break;
             case PropertySerializationKind.BlittableStruct:
-                if (property.NestedSerializableType is not null)
-                {
-                    sourceBuilder.AppendLine($"return new {GetQualifiedViewName(property.NestedSerializableType)}(serializedMemory.Slice(propertyDataOffset, {property.ElementByteCount}));");
-                }
-                else
-                {
-                    sourceBuilder.AppendLine("// Fallback generated unexpectedly. According to the specification, this fallback should not be reached (the view always returns the view in any case).");
-                    sourceBuilder.AppendLine($"return MemoryMarshal.Read<{GetSerializedPropertyType(property).ToDisplayString(SymbolDisplayFormat.FullyQualifiedFormat)}>(serializedData.Slice(propertyDataOffset, {property.ElementByteCount}));");
-                }
+                sourceBuilder.AppendLine($"return new {GetQualifiedViewName(property.NestedSerializableType!)}(serializedMemory.Slice(propertyDataOffset, {property.ElementByteCount}));");
                 break;
             case PropertySerializationKind.String:
                 EmitViewCollectionHeader(sourceBuilder, "serializedData", "propertyDataOffset");
@@ -1350,6 +1342,28 @@ var propertyReturnType
 
         sourceBuilder.CloseBlock();
         sourceBuilder.CloseBlock();
+
+        if (property.Kind == PropertySerializationKind.BlittableStruct && !property.IsNullableType)
+        {
+            sourceBuilder.AppendLine();
+            string valueType = property.Symbol.Type.ToDisplayString(SymbolDisplayFormat.FullyQualifiedFormat);
+            sourceBuilder.AppendLine($"{propertyAccessibility} {valueType} {EscapeIdentifier(property.Symbol.Name)}_AsValue");
+            sourceBuilder.OpenBlock();
+            sourceBuilder.AppendLine("get");
+            sourceBuilder.OpenBlock();
+            if (containingModel.IsBlittableStruct)
+            {
+                sourceBuilder.AppendLine($"return MemoryMarshal.Read<{valueType}>(serializedMemory.Span.Slice({property.BlittableByteOffset}, {property.ElementByteCount}));");
+            }
+            else
+            {
+                sourceBuilder.AppendLine("ReadOnlySpan<byte> serializedData = serializedMemory.Span;");
+                sourceBuilder.AppendLine($"int propertyDataOffset = BinaryPrimitives.ReadInt32LittleEndian(serializedData.Slice({propertyIndex * 4}, 4));");
+                sourceBuilder.AppendLine($"return MemoryMarshal.Read<{valueType}>(serializedData.Slice(propertyDataOffset, {property.ElementByteCount}));");
+            }
+            sourceBuilder.CloseBlock();
+            sourceBuilder.CloseBlock();
+        }
     }
 
     private static void EmitViewCollectionHeader(

tests/SerializationTests.cs

@@ -1387,4 +1387,45 @@ public void NullableStructViewsSerializeAndDeserializeCorrectly()
         TestAssert.Equal(ByteState.Ready, viewNull.NonBlittableStruct.ByteState, "NonBlittableStruct.ByteState");
         Assert.Null(viewNull.NullableNonBlittableStruct);
     }
+
+    [Fact]
+    public void ViewStructProvidesAsValuePropertyOnlyForBlittableStructProperties()
+    {
+        Type viewType = typeof(NullableStructContainerModelView);
+
+        // Verify BlittableStruct has _AsValue property
+        PropertyInfo? blittableAsValueProp = viewType.GetProperty("BlittableStruct_AsValue");
+        Assert.NotNull(blittableAsValueProp);
+        TestAssert.Equal(typeof(PackedRecord), blittableAsValueProp.PropertyType, "BlittableStruct_AsValue PropertyType");
+
+        // Verify NullableBlittableStruct does NOT have _AsValue property
+        PropertyInfo? nullableBlittableAsValueProp = viewType.GetProperty("NullableBlittableStruct_AsValue");
+        Assert.Null(nullableBlittableAsValueProp);
+
+        // Verify NonBlittableStruct does NOT have _AsValue property
+        PropertyInfo? nonBlittableAsValueProp = viewType.GetProperty("NonBlittableStruct_AsValue");
+        Assert.Null(nonBlittableAsValueProp);
+
+        // Verify NullableNonBlittableStruct does NOT have _AsValue property
+        PropertyInfo? nullableNonBlittableAsValueProp = viewType.GetProperty("NullableNonBlittableStruct_AsValue");
+        Assert.Null(nullableNonBlittableAsValueProp);
+
+        // Verify behavior on serialized instance
+        NullableStructContainerModel source = new NullableStructContainerModel
+        {
+            BlittableStruct = new PackedRecord { Number = 100, State = SignedState.Positive },
+            NullableBlittableStruct = new PackedRecord { Number = 200, State = SignedState.Negative },
+            NonBlittableStruct = new EnumStruct(ByteState.Ready, SignedState.Positive),
+            NullableNonBlittableStruct = null
+        };
+
+        byte[] buffer = new byte[256];
+        int written = source.Serialize(buffer);
+        NullableStructContainerModelView view = new NullableStructContainerModelView(buffer.AsMemory(0, written));
+
+        PackedRecord blittableValue = view.BlittableStruct_AsValue;
+        TestAssert.Equal(100, blittableValue.Number, "BlittableStruct_AsValue.Number");
+        TestAssert.Equal(SignedState.Positive, blittableValue.State, "BlittableStruct_AsValue.State");
+
+    }
 }