Ability to ignore Events or Properties

[FutureTD]

Hello, I have quite a few classes that implement INotifyPropertyChanged due to mvvm, cloning these classes seems to lead to a memory error and crash problem.

Is there a way to not clone events or specific properties?

[force-net]

Currently, there is no such ability. I've received another similar issues and will try to implement related feature.

[FutureTD]

Has this been implemented yet? This is a great library but this causes problems if a object implements INotifyPropertyChanged.

Maybe you can hard code it to not clone that property for the time being.

[force-net]

Not implemented yet. Sorry, I have no time to do this in nearest time. It not simple because code tries to clone object itself in one step (if possible), for this case I need some more analyzing to find best way to copy and test it. Also, before implementing I should check, whereas real problem exists.
I'll to to implement this asap, but cannot give any estimations about time.
Sorry

[luislhg]

Same issue here... When using INotifyPropertyChanged it becomes a problem that it copies the events. I was using MemberwiseClone before and had the same issue... Hoping for this to be configurable anytime soon. Thanks!

[maskalek]

Any hacks? How to override behavior?

[force-net]

I have ideas, but do not have enough time to fix it. You can try to do something like

var assembly = Assembly.GetAssembly(typeof(DeepClonerExtensions));
var deepClonerSafeTypes = assembly.GetType("Force.DeepCloner.Helpers.DeepClonerSafeTypes");
var knownTypesField = deepClonerSafeTypes.GetField("KnownTypes", BindingFlags.Static | BindingFlags.NonPublic);
var knownTypes = (ConcurrentDictionary<Type, bool>)knownTypesField.GetValue(null);
knownTypes.TryAdd(typeof(type_to_ignore), true);

It's dirty hack, and it will not work in future versions, but I'll try to do something with this feature in future versions :)

[GF-Huang]

Any progress?

[sgf]

A feasible method may be to add a generic overload to DeepClone DeepClone(params Expression<T,TFieldName>[] ignoreExps)
or
DeepClone(params string[] ignoreExps)
Get the field names, attribute names, etc. that need to be ignored through ignoreExp.

[Dunge]

Adding the event in the the ignore code above doesn't seem to be working.

    public class Test : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;

        private string _prop;
        public string Prop
        {
            get
            {
                return _prop;
            }

            set
            {
                _prop = value;
                PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(Prop)));
            }
        }
    }

    public void TestMethod()
    {
            var assembly = Assembly.GetAssembly(typeof(DeepClonerExtensions));
            var deepClonerSafeTypes = assembly.GetType("Force.DeepCloner.Helpers.DeepClonerSafeTypes");
            var knownTypesField = deepClonerSafeTypes.GetField("KnownTypes", BindingFlags.Static | BindingFlags.NonPublic);
            var knownTypes = (ConcurrentDictionary<Type, bool>)knownTypesField.GetValue(null);
            knownTypes.TryAdd(typeof(PropertyChangedEventHandler), true);

            var a = new Test();
            a.PropertyChanged += (sender, args) => { _logger.LogInformation(((Test)sender).Prop); };
            a.Prop = "A changed";
            var b = a.DeepClone();
            b.Prop = "B changed";
    }

The event trigger on the cloned objects and it prints both changed line.