如何在ASP.NET Core中设置Automapper

Z时代
2024-01-10
分类：问答

我是.NET的新手，所以我决定使用.NET Core，而不是学习“旧方法”。我在这里找到了有关为.NET

Core设置AutoMapper的详细文章，但是对于新手来说，是否有更简单的演练？

回答：

我想到了！详细信息如下：

通过NuGet将主要的AutoMapper软件包添加到您的解决方案中。

通过NuGet将AutoMapper依赖项注入程序包添加到您的解决方案中。

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的类，MappingProfile.cs并添加了以下代码。）我将使用Userand UserDto对象作为示例。

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如下所示添加AutoMapperConfiguration ：

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

// Auto Mapper Configurations

var mappingConfig = new MapperConfiguration(mc =>

{

mc.AddProfile(new MappingProfile());

});

IMapper mapper = mappingConfig.CreateMapper();
services.AddSingleton(mapper);
services.AddMvc();

}

要在代码中调用映射的对象，请执行以下操作：

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!
}