ASP.Net MVC 你在哪里从实体转换到视图模型? [英] ASP.Net MVC Where do you convert from Entities to ViewModels?

问题描述

标题几乎解释了这一切，这是我尝试在我们的项目中工作的最后一件事.我们由一个包含类似功能的服务库构成.

Title pretty much explains it all, its the last thing I'm trying to work into our project. We are structured with a Service Library which contains a function like so.

        /// <summary>
        /// Returns a single category based on the specified ID.
        /// </summary>
        public Category GetCategory(int CategoryID)
        {
            var RetVal = _session.Single<Category>(x => x.ID == CategoryID);
            return RetVal;
        }

现在 Category 是一个实体(我们正在使用实体框架)，我们需要将其转换为 CategoryViewModel.

Now Category is a Entity (We are using Entity Framework) we need to convert that to a CategoryViewModel.

现在，人们将如何构建它?你会确保服务函数返回一个 CategoryViewModel 吗?让控制器从服务中提取数据，然后调用另一个函数转换到视图模型?

Now, how would people structure this? Would you make sure the service function returned a CategoryViewModel? Have the controller pull the data from the service then call another function to covnert to a view model?

推荐答案

这是博客文章 我写道:

[AutoMap(typeof(IEnumerable<User>), typeof(IEnumerable<UserViewModel>))]
public ActionResult Index()
{
    // return all users
    IEnumerable<User> users = Repository.GetUsers();
    return View(users);
}

在这种情况下，相应的视图被强类型化为 IEnumerable.它使用 AutoMapper 来定义实体和视图模型之间的转换规则.至于 [AutoMap] 属性，它是一个自定义操作过滤器，它检查传递给视图的模型并应用适当的转换，以便视图只有视图模型.

In this case the corresponding view is strongly typed to IEnumerable<UserViewModel>. It uses AutoMapper to define conversion rules between entities and view models. As for the [AutoMap] attribute, it's a custom action filter which inspects the model passed to the view and applies the proper conversion so that the view has only the view model.

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