omu.valueinjecter 深度克隆不同类型 [英] omu.valueinjecter deep clone unlike types

问题描述

我想我缺少 valueinjecter 和/或 AutoMapper 的一个简单概念，但是您如何将父 dto.Entity 深度克隆到 biz.Entity 并包括所有子项?

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?

例如，biz.person.InjectFrom(dto.person).我希望 dto.person.AddressList 集合向下复制到 biz.person.AddressList 集合，即使 dto.Address 和 biz.Address 是不同的类型，但有相同的属性名称.

For example, biz.person.InjectFrom(dto.person). I want the dto.person.AddressList collection to copy down to biz.person.AddressList collection, even though dto.Address and biz.Address are unlike types, but have the same property names.

我的想法是，如果父属性名称拼写相同，例如AddressList，那么 2 个底层对象是否属于不同类型都无关紧要.它仍然会复制同名的简单类型，如 int、string 等.

My thinking is that if the Parent property names are spelled the same, e.g. AddressList, then it wouldn't matter if the 2 underlying objects were of different types. It would still copy same-named simple types like int, string, etc.

谢谢

推荐答案

当对象中的数组/列表具有相同的名称但类型不同(即类型为 ORMAnimals[] 映射的名为 Animals 的属性时，我遇到了同样的问题到类型为 Animals[] 的名为 Animals 的属性).

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[]).

对 Chuck Norris 在 Deep Cloning 页面上的示例代码进行了一些小的调整 我在我的测试代码中得到了它:

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);
    }
}

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