如何在 ASP.NET Core 中设置 Automapper [英] How to set up Automapper in ASP.NET Core

问题描述

我对 .NET 比较陌生，因此我决定解决 .NET Core 而不是学习旧方法".我找到了一篇关于 为 .NET Core 设置 AutoMapper 的详细文章在这里，但是对于新手有没有更简单的演练?

I'm relatively new at .NET, and I decided to tackle .NET Core instead of learning the "old ways". I found a detailed article about setting up AutoMapper for .NET Core here, but is there a more simple walkthrough for a newbie?

推荐答案

我想通了！详情如下:

1. 通过 NuGet 将主要 AutoMapper 包添加到您的解决方案中.

1. Add the main AutoMapper Package to your solution via NuGet.

通过 NuGet<，将 AutoMapper 依赖注入包添加到您的解决方案中/a>.

Add the AutoMapper Dependency Injection Package to your solution via NuGet.

为映射配置文件创建一个新类.(我在主解决方案目录中创建了一个名为 MappingProfile.cs 的类并添加以下代码.)我将使用 User 和 UserDto以对象为例.

Create a new class for a mapping profile. (I made a class in the main solution directory called MappingProfile.cs and add the following code.) I'll use a User and UserDto object as an example.

 public class MappingProfile : Profile {
     public MappingProfile() {
         // Add as many of these lines as you need to map your objects
         CreateMap<User, UserDto>();
         CreateMap<UserDto, User>();
     }
 }

然后在Startup.cs中添加AutoMapperConfiguration，如下图:

Then add the AutoMapperConfiguration in the Startup.cs as shown below:

 public void ConfigureServices(IServiceCollection services) {
     // .... Ignore code before this

    // Auto Mapper Configurations
     var mapperConfig = new MapperConfiguration(mc =>
     {
         mc.AddProfile(new MappingProfile());
     });

     IMapper mapper = mapperConfig.CreateMapper();
     services.AddSingleton(mapper);

     services.AddMvc();

 }

要在代码中调用映射对象，请执行以下操作:

To invoke the mapped object in code, do something like the following:

 public class UserController : Controller {

     // Create a field to store the mapper object
     private readonly IMapper _mapper;

     // Assign the object in the constructor for dependency injection
     public UserController(IMapper mapper) {
         _mapper = mapper;
     }

     public async Task<IActionResult> Edit(string id) {

         // Instantiate source object
         // (Get it from the database or whatever your code calls for)
         var user = await _context.Users
             .SingleOrDefaultAsync(u => u.Id == id);

         // Instantiate the mapped data transfer object
         // using the mapper you stored in the private field.
         // The type of the source object is the first type argument
         // and the type of the destination is the second.
         // Pass the source object you just instantiated above
         // as the argument to the _mapper.Map<>() method.
         var model = _mapper.Map<UserDto>(user);

         // .... Do whatever you want after that!
     }
 }

这篇关于如何在 ASP.NET Core 中设置 Automapper的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！