类型 '' 不能用作泛型类型 'ICrudAppService' 中的类型参数 'TEntityDto'

Question

我正在阅读关于 abp.io 的教程：
https://docs.abp.io/en/abp/latest/Tutorials/Part-1?UI=MVC#create-the-application-service

我创建了服务：

using Abp.Application.Services;

public interface IBookAppService : 
    ICrudAppService< //Defines CRUD methods
        BookDTO , //Used to show books
        Guid, //Primary key of the book entity
        PagedAndSortedResultRequestDto, //Used for paging/sorting on getting a list of books
        CreateUpdateBookDto, //Used to create a new book
        CreateUpdateBookDto> //Used to update a book
{

}

但是界面显示错误:

The type 'BookDTO' cannot be used as type parameter 'TEntityDto' in the generic type or method 'ICrudAppService<TEntityDto, TPrimaryKey, TGetAllInput, TCreateInput, TUpdateInput>'. There is no implicit reference conversion from 'BookDTO' to 'Abp.Application.Services.Dto.IEntityDto<System.Guid>'.

BookDTO如下：

using Volo.Abp.Application.Dtos;

public class BookDTO : AuditedEntityDto<Guid>
{
    public string Name { get; set; }

    public BookType Type { get; set; }
    public DateTime PublishDate { get; set; }
    public float Price { get; set; }
}

Answer 1

CreateUpdateBookDto 必须是相同的主键类型。

public class CreateUpdateBookDto: AuditedEntityDto<Guid> {
}

Answer 2

您正在混合：

Abp.Application.Services.ICrudAppService<TEntityDto, TPrimaryKey, ...>
Volo.Abp.Application.Dtos.IEntityDto<TKey>

对于 ABP 框架 (abp.io)，使用 Volo.Abp 包：

Volo.Abp.Application.Services.ICrudAppService<TEntityDto, in TKey, ...>

要更改的文件

IBookAppService.cs:

// using Abp.Application.Services;
// using Abp.Application.Services.Dto;
using Volo.Abp.Application.Dtos;
using Volo.Abp.Application.Services;

BookAppService.cs:

// using Abp.Application.Services;
// using Abp.Application.Services.Dto;
// using Abp.Domain.Repositories;
using Volo.Abp.Application.Dtos;
using Volo.Abp.Application.Services;
using Volo.Abp.Domain.Repositories;

CreateUpdateBookDTO.cs:

// using Abp.AutoMapper;

Acme.BookStore.Application.Contracts.csproj:

<!-- <PackageReference Include="Abp" Version="5.6.0" /> -->
<!-- <PackageReference Include="Abp.AutoMapper" Version="5.6.0" /> -->
<PackageReference Include="Volo.Abp" Version="2.6.2" />
<PackageReference Include="Volo.Abp.AutoMapper" Version="2.6.2" />

类型 '' 不能用作泛型类型 'ICrudAppService' 中的类型参数 'TEntityDto'

The type '' cannot be used as type parameter 'TEntityDto' in the generic type 'ICrudAppService'

c#

generics

asp.net-core

abp

要更改的文件