Question

the generated code from EF for a property of an entity looks like this:

        /// <summary>
        /// No Metadata Documentation available.
        /// </summary>
        [EdmScalarPropertyAttribute(EntityKeyProperty=false, IsNullable=false)]
        [DataMemberAttribute()]
        public global::System.DateTime DateCreated
        {
            get
            {
                return _DateCreated;
            }
            set
            {
                OnDateCreatedChanging(value);
                ReportPropertyChanging("DateCreated");
                _DateCreated = StructuralObject.SetValidValue(value);
                ReportPropertyChanged("DateCreated");
                OnDateCreatedChanged();
            }
        }
        private global::System.DateTime _DateCreated;
        partial void OnDateCreatedChanging(global::System.DateTime value);
        partial void OnDateCreatedChanged();

This code doesn’t check if the value has actually changed (in the setter). Therefore the PropertyChanged event is raised even if you set a value that is equal to the current value. But in this case nothing would have changed, so I wouldn’t want this event…

For EntityKey properties they do check this:

        /// <summary>
        /// No Metadata Documentation available.
        /// </summary>
        [EdmScalarPropertyAttribute(EntityKeyProperty=true, IsNullable=false)]
        [DataMemberAttribute()]
        public global::System.Guid Id
        {
            get
            {
                return _Id;
            }
            set
            {
                if (_Id != value)
                {
                    OnIdChanging(value);
                    ReportPropertyChanging("Id");
                    _Id = StructuralObject.SetValidValue(value);
                    ReportPropertyChanged("Id");
                    OnIdChanged();
                }
            }
        }
        private global::System.Guid _Id;
        partial void OnIdChanging(global::System.Guid value);
        partial void OnIdChanged();

I would expect this behavior from all properties.
Am I missing a setting in the model designer, or is there another solution?

Thanx!

Answer 1

It is point of T4 templates to allow you modifications you need. It is absolutely wrong approach to say:

But I would rather not use a custom template in my project!

It is like throwing all advantages of T4 templates away and going back to hardcoded custom tools for code generating.