omu.valueinjecter deep clone unlike types

Question

I think I\'m missing a simple concept with valueinjecter and/or AutoMapper, but how do you deep clone a parent dto.Entity to biz.Entity and include all children?

For

Answer 1

I had this issue, even using the CloneInjection wasn't working to copy the properties with same name and diferent types. So I changed a few things in the CloneInjection (I'm using ValueInjecter version 3.1.3).

public class CloneInjection : LoopInjection
{
    protected override void Execute(PropertyInfo sp, object source, object target)
    {
        var tp = target.GetType().GetProperty(sp.Name);
        if (tp == null) return;
        var val = sp.GetValue(source);
        if (val == null) return;

        tp.SetValue(target, GetClone(sp, tp, val));
    }

    private static object GetClone(PropertyInfo sp, PropertyInfo tp, object val)
    {
        if (sp.PropertyType.IsValueType || sp.PropertyType == typeof(string))
        {
            return val;
        }

        if (sp.PropertyType.IsArray)
        {
            var arr = val as Array;
            var arrClone = arr.Clone() as Array;

            for (int index = 0; index < arr.Length; index++)
            {
                var a = arr.GetValue(index);
                if (a.GetType().IsValueType || a is string) continue;

                arrClone.SetValue(Activator.CreateInstance(a.GetType()).InjectFrom<CloneInjection>(a), index);
            }

            return arrClone;
        }

        if (sp.PropertyType.IsGenericType)
        {
            //handle IEnumerable<> also ICollection<> IList<> List<>
            if (sp.PropertyType.GetGenericTypeDefinition().GetInterfaces().Contains(typeof(IEnumerable)))
            {
                var genericType = tp.PropertyType.GetGenericArguments()[0];

                var listType = typeof(List<>).MakeGenericType(genericType);
                var list = Activator.CreateInstance(listType);

                var addMethod = listType.GetMethod("Add");
                foreach (var o in val as IEnumerable)
                {
                    var listItem = genericType.IsValueType || genericType == typeof(string) ? o : Activator.CreateInstance(genericType).InjectFrom<CloneInjection>(o);
                    addMethod.Invoke(list, new[] { listItem });
                }

                return list;
            }

            //unhandled generic type, you could also return null or throw
            return val;
        }

        return Activator.CreateInstance(tp.PropertyType)
            .InjectFrom<CloneInjection>(val);
    }
}

I used like this:

var entityDto = new EntityDto().InjectFrom<CloneInjection>(sourceEntity);

I hope it helps!

Answer 2

I was having the same issue when the arrays/lists in the objects have the same names but different types (ie a property named Animals of type ORMAnimals[] mapping to a property named Animals of type Animals[]).

With some minor tweaks to the sample code Chuck Norris has on the Deep Cloning page I got it working in my test code:

public class CloneInjection : ConventionInjection
{
    protected override bool Match(ConventionInfo c)
    {
        return c.SourceProp.Name == c.TargetProp.Name && c.SourceProp.Value != null;
    }

    protected override object SetValue(ConventionInfo c)
    {
        //for value types and string just return the value as is
        if (c.SourceProp.Type.IsValueType || c.SourceProp.Type == typeof(string)
            || c.TargetProp.Type.IsValueType || c.TargetProp.Type == typeof(string))
            return c.SourceProp.Value;

        //handle arrays
        if (c.SourceProp.Type.IsArray)
        {
            var arr = c.SourceProp.Value as Array;
            var clone = Activator.CreateInstance(c.TargetProp.Type, arr.Length) as Array;

            for (int index = 0; index < arr.Length; index++)
            {
                var a = arr.GetValue(index);
                if (a.GetType().IsValueType || a.GetType() == typeof(string)) continue;
                clone.SetValue(Activator.CreateInstance(c.TargetProp.Type.GetElementType()).InjectFrom<CloneInjection>(a), index);
            }
            return clone;
        }


        if (c.SourceProp.Type.IsGenericType)
        {
            //handle IEnumerable<> also ICollection<> IList<> List<>
            if (c.SourceProp.Type.GetGenericTypeDefinition().GetInterfaces().Contains(typeof(IEnumerable)))
            {
                var t = c.TargetProp.Type.GetGenericArguments()[0];
                if (t.IsValueType || t == typeof(string)) return c.SourceProp.Value;

                var tlist = typeof(List<>).MakeGenericType(t);
                var list = Activator.CreateInstance(tlist);

                var addMethod = tlist.GetMethod("Add");
                foreach (var o in c.SourceProp.Value as IEnumerable)
                {
                    var e = Activator.CreateInstance(t).InjectFrom<CloneInjection>(o);
                    addMethod.Invoke(list, new[] { e }); // in 4.0 you can use dynamic and just do list.Add(e);
                }
                return list;
            }

            //unhandled generic type, you could also return null or throw
            return c.SourceProp.Value;
        }

        //for simple object types create a new instace and apply the clone injection on it
        return Activator.CreateInstance(c.TargetProp.Type)
            .InjectFrom<CloneInjection>(c.SourceProp.Value);
    }
}