如何在ASP.NET MVC中配置AutoMapper属性 [英] How to Configure AutoMapper Attributes in ASP.NET MVC

问题描述

根据 GitHUb 文档，要使用 AutoMapper.Attributes 需要完成以下三个步骤:

According to the GitHUb documentation, To use AutoMapper.Attributes need three steps to be done as follows:

1. 创建要映射的类.

1. Create the classes you'd like to map.

将[MapsTo]属性添加到源类中，并使用目标类型作为参数. (或者，您可以使用[MapsFrom]属性将目标类与源类型进行映射.)

Add the [MapsTo] attribute to the source class, with the destination type as the argument. (Alternatively, you can use the [MapsFrom] attribute to map the destination class with the source type.)

我已经完成了第1步和第2步，但无法理解如何以及在何处使用第3步:

这是我的Model类:

Here is my Model classes:

[MapsFrom(typeof(ApplicationRole))]
public class RoleViewModel
{
    public int Id { get; set; }
    [Required(AllowEmptyStrings = false)]
    [Display(Name = "Role Name")]
    public string Name { get; set; }
    public string Description { get; set; }
}

[MapsTo(typeof(RoleViewModel))]
public class ApplicationRole : IdentityRole<int, ApplicationUserRole>, IRole<int>
{
    public string Description  { get; set; }
}

这是我的控制器方法:

public ActionResult Index()
{
    List<ApplicationRole> applicationRoles = RoleManager.Roles.ToList();
    List<RoleViewModel> roleList = Mapper.Map<List<RoleViewModel>>(applicationRoles);  
    return View(roleList);
}

有人会告诉我如何和在哪里调用程序集上的 MapTypes() 扩展方法，该方法要按照步骤3的建议从中映射类型 AutoMapper.Attributes 文档.

Would anybody tell me how to and where to Call the MapTypes() extension method on the assembly from which I want to map my types as suggested in step three of the AutoMapper.Attributes documentation.

推荐答案

我将在Controller中(最终在构造函数中)进行操作:

I would do in the Controller (eventually in the constructor):

 typeof(RoleViewModel).Assembly.MapTypes();

如果安装Automapper的版本4，则可以解决此问题，因为在最后一个版本中，属性不起作用.因此，请在Package-Manager控制台中添加以下说明:

The problem can be solved if you install version 4 of Automapper because in the last version Attributes are not working. So please add the following instructions in Package-Manager Console:

uninstall-package Automapper

install-package Automapper -version 4.2.1

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