Base types on nested validation exclude

Author: i4004

src/Simplify.Web.Tests/Model/Validation/ValidationAttributesExecutorTests.cs

@@ -73,5 +73,19 @@ public void Validate_InheritedProperty_NestedNullAttributeException()
 			Assert.That(ex.Message,
 				Does.StartWith($"Required property '{nameof(BaseNestedModel.BuiltInType)}' is null or empty"));
 		}
+
+		[Test]
+		public void Validate_NotNullSystemTypes_NoExceptions()
+		{
+			// Arrange
+			var model = new SystemTypesModel
+			{
+				StringProperty = "test",
+				IntProperty = 23
+			};
+
+			// Act
+			_validator.Validate(model, null);
+		}
 	}
 }

src/Simplify.Web.Tests/TestEntities/SystemTypesModel.cs

@@ -0,0 +1,16 @@
+#nullable disable
+
+using Simplify.Web.Model.Validation.Attributes;
+
+namespace Simplify.Web.Tests.TestEntities
+{
+	public class SystemTypesModel
+	{
+		[Required]
+		public string StringProperty { get; set; }
+
+		public int IntProperty { get; set; }
+
+		public bool BoolProperty { get; set; }
+	}
+}

src/Simplify.Web/Model/Validation/ValidationAttributesExecutor.cs

@@ -56,7 +56,7 @@ private static void ValidateProperty(object? value, PropertyInfo propertyInfo, I
 		private void Validate(Type type, object? value, IDIResolver resolver)
 		{
 			if (Nesting)
-				if (type.BaseType != null && type.BaseType != typeof(object))
+				if (type.BaseType != null && type.BaseType != typeof(object) && !IsSystemType(type.BaseType))
 					Validate(type.BaseType, value, resolver);
 
 			foreach (var item in type.GetProperties())
@@ -65,9 +65,14 @@ private void Validate(Type type, object? value, IDIResolver resolver)
 
 				ValidateProperty(currentItemValue, item, resolver);
 
-				if (Nesting && currentItemValue != default)
+				if (Nesting && currentItemValue != default && !IsSystemType(item.PropertyType))
 					Validate(item.PropertyType, currentItemValue, resolver);
 			}
 		}
+
+		private bool IsSystemType(Type type)
+		{
+			return type.Namespace?.StartsWith("System") ?? false;
+		}
 	}
 }