XAF0002: XPO business class properties should not be overridden

• Jun 19, 2024
• 2 minutes to read

Severity: Warning

XAF and XPO do not support the following business object’s properties:

• Declared with the new keyword.
• Overridden and virtual properties.
• Abstract properties.

For more information about these requirements, see the following article: Can I override properties of business objects?.

This diagnostic works only for XPO classes derived from the DevExpress.Xpo.PersistentBase class. This diagnostic does not check static properties.

Examples

Invalid Code

C#

using DevExpress.Persistent.BaseImpl;
using DevExpress.Xpo;

namespace MySolution.Module.BusinessObjects {
    public class TestClass : TestClassBase {
        public TestClass(Session session) : base(session) { }

        private int testProperty1;
        // The property must not be virtual
        //public virtual int TestProperty1 { // Warning: XAF0002
        //    get { return testProperty1; }
        //    set { SetPropertyValue(nameof(TestProperty1), ref testProperty1, value); }
        //}

        private int testProperty2; 
        // The property must not override a property from a base class
        //public override int TestProperty2 { // Warning: XAF0002
        //    get { return testProperty2 + 1; }
        //    set { SetPropertyValue(nameof(TestProperty2), ref testProperty2, value); }
        //}

        private int testProperty3; 
        // The property must not be declared with the `new` keyword
        //public new int TestProperty3 { // Warning: XAF0002
        //    get { return testProperty3 + 1; }
        //    set { SetPropertyValue(nameof(TestProperty3), ref testProperty3, value); }
        //}
    }
}

Valid Code

C#

using DevExpress.Persistent.BaseImpl;
using DevExpress.Xpo;

namespace MySolution.Module.BusinessObjects {
    public class TestClass : TestClassBase {
        public TestClass(Session session) : base(session) { }

        private int testProperty;
        // The property that meets the requirements
        public int TestProperty { 
            get { return testProperty; }
            set { SetPropertyValue(nameof(TestProperty), ref testProperty, value); }
        }
    }
}

How to Fix

Check the business object’s property declaration and ensure the property is declared without the following modifiers:

• abstract
• virtual
• override
• new