将一个对象映射到另一个对象的最佳实践 [英] Best Practices for mapping one object to another

问题描述

我的问题是，以最可维护的方式将一个对象映射到另一个对象的最佳方式是什么.我无法改变我们获得的 Dto 对象的设置方式，使其更加规范化，因此我需要创建一种方法将其映射到我们对他们对象的实现.

My question is, what is the best way I can map one object to another in the most maintainable manner. I cannot change the way the Dto object that we are getting is setup to be more normalized so I need to create a way to map this to our implementation of their object.

以下示例代码显示了我需要执行的操作:

Here is example code to show what I need to happen:

class Program
{
    static void Main(string[] args)
    {
        var dto = new Dto();

        dto.Items = new object[] { 1.00m, true, "Three" };
        dto.ItemsNames = new[] { "One", "Two", "Three" };            

        var model = GetModel(dto);

        Console.WriteLine("One: {0}", model.One);
        Console.WriteLine("Two: {0}", model.Two);
        Console.WriteLine("Three: {0}", model.Three);
        Console.ReadLine();
    }

    private static Model GetModel(Dto dto)
    {
        var result = new Model();

        result.One = Convert.ToDecimal(dto.Items[Array.IndexOf(dto.ItemsNames, "One")]);
        result.Two = Convert.ToBoolean(dto.Items[Array.IndexOf(dto.ItemsNames, "Two")]);
        result.Three = dto.Items[Array.IndexOf(dto.ItemsNames, "Three")].ToString();

        return result;
    }
}

class Dto
{
    public object[] Items { get; set; }
    public string[] ItemsNames { get; set; }
}

class Model
{
    public decimal One { get; set; }
    public bool Two { get; set; }
    public string Three { get; set; }
}

我认为如果我有某种映射器类可以接收模型对象的propertyInfo、我想转换成的类型以及我想取出的itemname"，那就太好了.有没有人有任何建议可以使这个更清洁?

I think what would be great is if I had some sort of mapper class that would take in the model objects propertyInfo, the type I want to convert to, and the "itemname" I want to pull out. Does anyone have any suggestions to make this cleaner?

谢谢！

推荐答案

我会选择 AutoMapper，一个开源的和免费的映射库，它允许基于约定将一种类型映射到另一种类型(即映射具有相同名称和相同/派生/可转换类型的公共属性，以及许多其他 智能的).非常好用，会让你达到这样的效果:

I would opt for AutoMapper, an open source and free mapping library which allows to map one type into another, based on conventions (i.e. map public properties with the same names and same/derived/convertible types, along with many other smart ones). Very easy to use, will let you achieve something like this:

Model model = Mapper.Map<Model>(dto);

不确定您的具体要求，但 AutoMapper 还支持自定义值解析器，它应该可以帮助您编写特定映射器的单一通用实现.

Not sure about your specific requirements, but AutoMapper also supports custom value resolvers, which should help you writing a single, generic implementation of your particular mapper.

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