现在我们来创建应用层，首先在Application.Contracts项目中创建Poets子目录，在这个目录中创建DTO和AppService的接口。我们需要两个Dto，一个负责保存查询数据，另一个负责将传输编辑数据，这两个Dto的代码如下：

using System;
using System.Collections.Generic;
using System.Text;
using Volo.Abp.Application.Dtos;

namespace ZL.Test.Poets
{
    public class PoetDto : AuditedEntityDto<Guid>
    {
        public string Name { get; set; }
        public string Description { get; set; }
    }
}

创建和修改的Dto：

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Text;

namespace ZL.Test.Poets
{
    public class CreateUpdatePoetDto
    {
        [Required]
        [StringLength(128)]
        public string Name { get; set; }

        public string Description { get; set; }
    }
}

服务接口从ICrudAppService派生：

using System;
using System.Collections.Generic;
using System.Text;
using Volo.Abp.Application.Dtos;
using Volo.Abp.Application.Services;

namespace ZL.Test.Poets
{
    public interface IPoetAppService : ICrudAppService< //Defines CRUD methods
            PoetDto, //Used to show poets
            Guid, //Primary key of the poet entity
            PagedAndSortedResultRequestDto, //Used for paging/sorting
            CreateUpdatePoetDto> //Used to create/update a poet
    {
    }
}

在Application中创建服务接口的实现，代码如下：

using System;
using System.Collections.Generic;
using System.Text;
using Volo.Abp.Application.Dtos;
using Volo.Abp.Application.Services;
using Volo.Abp.Domain.Repositories;

namespace ZL.Test.Poets
{
    public class PoetAppService :
        CrudAppService<
            Poet, //The Poet entity
            PoetDto, //Used to show poets
            Guid, //Primary key of the book entity
            PagedAndSortedResultRequestDto, //Used for paging/sorting
            CreateUpdatePoetDto>, //Used to create/update a poet
        IPoetAppService
    {
        public PoetAppService(IRepository<Poet, Guid> repository) : base(repository)
        {
        }
    }
}

还需要在AutoMapperProfile中增加Dto的映射：

using AutoMapper;
using ZL.Test.Poets;

namespace ZL.Test
{
    public class TestApplicationAutoMapperProfile : Profile
    {
        public TestApplicationAutoMapperProfile()
        {
            /* You can configure your AutoMapper mapping configuration here.
             * Alternatively, you can split your mapping configurations
             * into multiple profile classes for a better organization. */
            CreateMap<Poet, PoetDto>();
            CreateMap<CreateUpdatePoetDto, Poet>();
        }
    }
}

到这里，应用层编写完成，ABP框架可以根据服务自动生成api的控制器，我们现在就可以运行应用，并使用swagger测试这些服务。运行应用，然后导航到swagger：

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