.NET Core 应用程序中如何安装和使用数据实体对象映射工具AutoMapper？

2 个回答

• 0

  在.NET Core的应用程序编程开发中，要安装和使用AutoMapper实体对象映射工具，首先需要通过Nuget包管理工具安装AutoMapper以及依赖注入扩展包AutoMapper.Extensions.Microsoft.DependencyInjection，然后调用services.AddAutoMapper()方法完成服务注册，如：

  var services = new ServiceCollection();
  services.AddAutoMapper(mapperConfig => mapperConfig.AddProfiles(GetType().Assembly))
  // ...
  

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  Rector

  2020-01-16 回答
• 0

  这里提供一个简单的、完整的AutoMapper使用示例。

  首先，分别创建两个实体类User和UserDTO:

  public class User
  {
      public int Id { get; set; }
      public string Name { get; set; }
  }
  public class UserDTO
  {
      public int Id { get; set; }
      public string Name { get; set; }
  }
  

  再创建一个完成AutoMapper映射关系配置的接口ICustomMapper及其对应的实现，如下：

  public interface ICustomMapper<T>
  {
      T MapUserToUserDTO();
  }
  public class CustomMapper : ICustomMapper<UserDTO>
  {
      private readonly IMapper mapper;
      public CustomMapper(IMapper mapper) =>
          this.mapper = mapper;
      public UserDTO MapUserToUserDTO()
      {
          User user = new User()
          {
             Id = 5,
             Name = "Iman"
          };
          UserDTO userDTO = mapper.Map<UserDTO>(user);
          return userDTO;
      }
  }
  

  最后，调用ServiceCollection.AddAutoMapper()方法完成服务注册，如下：

  using AutoMapper;
  using Microsoft.Extensions.DependencyInjection;
  
  namespace AutoMapperProject
  {
      class Program
      {
          private static IServiceProvider _serviceProvider;
          static void Main(string[] args)
          {
              RegisterServices();
              ICustomMapper<UserDTO> service = 
              _serviceProvider.GetService<ICustomMapper<UserDTO>>();
              UserDTO userDTO = service.MapUserToUserDTO();
              DisposeServices();
              Console.WriteLine("Hello AutoMapper!");
          }
          private static void RegisterServices()
          {
              var collection = new ServiceCollection();
              collection.AddAutoMapper(typeof(Program));
              collection.AddScoped<ICustomMapper<UserDTO>, CustomMapper>();
              // ...
              _serviceProvider = collection.BuildServiceProvider();
          }
          private static void DisposeServices()
          {
             if (_serviceProvider == null)
             {
                return;
             }
             if (_serviceProvider is IDisposable)
             {
                ((IDisposable)_serviceProvider).Dispose();
             }
          }
      }
  }
  

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  Rector

  2020-01-16 回答